CN110187065A - The measuring method of sulfur dioxide gas content in a kind of air - Google Patents
The measuring method of sulfur dioxide gas content in a kind of air Download PDFInfo
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- CN110187065A CN110187065A CN201910521417.5A CN201910521417A CN110187065A CN 110187065 A CN110187065 A CN 110187065A CN 201910521417 A CN201910521417 A CN 201910521417A CN 110187065 A CN110187065 A CN 110187065A
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000006243 chemical reaction Methods 0.000 claims abstract description 53
- 238000005259 measurement Methods 0.000 claims abstract description 24
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000005864 Sulphur Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 46
- 238000012360 testing method Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- 239000003513 alkali Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000013022 venting Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 238000003556 assay Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 abstract description 63
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical group OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 2
- 235000010269 sulphur dioxide Nutrition 0.000 abstract 8
- 230000003113 alkalizing effect Effects 0.000 abstract 1
- 239000004291 sulphur dioxide Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 56
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000003916 acid precipitation Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 2
- 231100001243 air pollutant Toxicity 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- TXVHTIQJNYSSKO-UHFFFAOYSA-N BeP Natural products C1=CC=C2C3=CC=CC=C3C3=CC=CC4=CC=C1C2=C34 TXVHTIQJNYSSKO-UHFFFAOYSA-N 0.000 description 1
- 208000005623 Carcinogenesis Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010014561 Emphysema Diseases 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 235000010624 Medicago sativa Nutrition 0.000 description 1
- 240000004658 Medicago sativa Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000036952 cancer formation Effects 0.000 description 1
- 231100000504 carcinogenesis Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000012272 crop production Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- HNBFUFIYQWYCDM-UHFFFAOYSA-N oxygen(2-) sulfane titanium(4+) Chemical compound [O--].[O--].S.[Ti+4] HNBFUFIYQWYCDM-UHFFFAOYSA-N 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 power industry Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- CCEKAJIANROZEO-UHFFFAOYSA-N sulfluramid Chemical group CCNS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F CCEKAJIANROZEO-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0042—SO2 or SO3
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Biophysics (AREA)
- Molecular Biology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a kind of measuring methods of sulfur dioxide gas content in air, belong to sulfur dioxide field of measuring technique.The present invention compresses gas pressurized to be measured, convenient for improving the partial pressure with reaction solution effect, accelerate the rate that Sulphur Dioxide is sulfurous acid, and it with lower temperature and stirs at low speed, it is full and uniform in adjustment process convenient for absorbing and alkalizing in gas, it can preferably complete to detect, the present invention passes through influence of the sour gas sulfur dioxide to lye pH, in conjunction with the accurate measurement to pH, obtain the amount of sulfurous acid, it being capable of content of sulfur dioxide in preliminary survey air to be measured, then the sulfur dioxide gas of absorption is heated into export, with excessive hydrogen sulfide under the action of certain air humidity, obtain sulphur simple substance, and then repetition measurement gas content, finally average, up to sulfur dioxide gas content.The present invention solves the problem of bad to the operation continuity and convenience of sulfur dioxide content in air continuous mode at present, higher cost.
Description
Technical field
The invention belongs to a kind of surveys of sulfur dioxide gas content in sulfur dioxide field of measuring technique more particularly to air
Determine method.
Background technique
Sulfur dioxide (SO2) it is most common, simplest oxysulfide.One of Air Pollutant Discharge.When volcano eruption
The gas can be sprayed, sulfur dioxide can be also generated in many industrial process.Since coal and petroleum usually all contain element sulphur, because
Sulfur dioxide can be generated when this burning.When sulfur dioxide is soluble in water, sulfurous acid will form.If sulfurous acid is further existed
It is aoxidized under the conditions of PM2.5 is existing, sulfuric acid (main component of acid rain) will be efficiently produced rapidly.Here it is to using these combustions
One of the reason of expecting the worry as the environmental effect of the energy.Sulfur dioxide is arch-criminal important in air pollution.In nature
Middle sulphur-containing substance and element sulphur can generate sulfur dioxide (SO in combustion2).The oxysulfide of atmosphere pollution is caused, it is main
Will from non-ferrous metal metallurgy (such as: copper, zinc, lead it is thick refining etc.), sulfuric acid manufacture and fossil fuel (coal, petroleum etc.) burn
Process.There are the industry of hundreds of thousands platform and civil boiler in China, and based on fire coal, the 70% of China's energy from fire coal, release by fire coal
The SO put2Constitute the primary pollutant of pollution atmospheric environment.SO2The priority pollutant for implementing overall control for China is country
With each province's discharge standard of air pollutants, power industry, building material industry, metallurgy industry, chemical industry, urban service
The industry of industry (rubbish, hazardous waste) and combustion of fossil fuels and heating boiler etc., it is desirable that the pollutant of monitoring.
SO2It is very big to the harm of people and plant.SO2Into the activity of blood energy destructive enzyme, liver is damaged.As SO in atmosphere2
Concentration be 400 μm of ol/mol when can make one to have difficulty in breathing, immunity of organism is obviously inhibited.If with pellet
Suck SO2, the aerosol particles of pellet can be SO2Taking lung to increases toxicity by 3~4 times, leads to pulmonary emphysema.SO2
It can also reinforce the carcinogenesis of carcinogenic substance benzo (a) pyrene.SO in atmosphere2Ornamental plant, purple lucerne can be made by reaching a certain concentration
Mu leaf etc. is aggrieved.SO2Or one of the main matter of acid rain is formed, the surface of all kinds of buildings of acid rain corrosion makes soil acidification,
Crop production reduction is caused, large stretch of forest death etc. is made.
Patent CN201711204987.9 discloses the method for sulfur dioxide gas content in detection air indirectly at present, this
If invention includes the following steps that a. prepares distilled water dry doubling and is exposed to area to be measured 10 hours, detected solution is made；B. conduction is surveyed
Examination contact and temperature test contact immerse in detected solution and measure current values and temperature value；C. by the current value measured and
Temperature value inputs in server and compared with the corresponding data of typing before, obtains the solute concentration of detected solution；D. gas is used
Body extraction machine will contain SO2The air of gas is inputted in the aqueous solution in open container by air inlet pipe and conduit；It e. will be conductive
It tests contact and temperature test contact immerses above-mentioned aqueous solution, detection calculates SO2Gas content, this method, which passes through, indirectly to be detected
Method can effectively calculate the content of sulfur dioxide in air, but this method is complex, higher cost, under electric heating effect often
A small amount of sulfur dioxide evolution is had, the operation continuity and convenience in continuous mode are bad, thus needing one kind can be convenient
Detection, continuity complete the detection method that repeated detection reduces measurement error.
Summary of the invention
It is an object of the invention to: in order to solve the operation continuity to sulfur dioxide content in air continuous mode at present
And convenience is bad, higher cost, the problem of often having the evolution of a small amount of sulfur dioxide, provides sulfur dioxide gas in a kind of air
The measuring method of body content.
To achieve the goals above, present invention employs following technical solutions:
The measuring method of sulfur dioxide gas content, the measuring method include the following steps: in a kind of air
(1) functional instrument is set: Accurate pH digital display instrument, liquid-feeding tube, temperature controller, blender are set in sealing reactor；
(2) ventilation detection: 1L air to be measured is blasted in the closed reaction vessel equipped with reaction solution with air blower, compression should
It is passed through reaction solution after under test gas, reacting liquid pH value variation is detected；
(3) content preliminary survey: it is down to a certain range to reacting liquid pH value in venting process, carries out the calculating of assay；
(4) it heats air guide: completing after calculating, regulate and control the temperature controller in reaction solution and be warming up to 80~95 DEG C, export SO2Gas
Body, the pH of reaction solution after adjusting processing；
(5) sulphur processed is restored: by derived SO2Gas 1:3~7 and H by volume2S gas reacts in the reactor, generates S
Simple substance；
(6) content repetition measurement: by the content of sulfur dioxide in the quality repetition measurement air to be measured of S simple substance；
(7) content obtained by step (3) and step (6) data conclusion: is calculated into average value to get sulfur dioxide gas in air
Body content.
It is as above-mentioned technical proposal to further describe:
PH value of the Accurate pH digital display instrument to detect reaction solution in time in the step (1), convenient for showing that pH value carries out
Calculate and adjust pH.
It is as above-mentioned technical proposal to further describe:
Liquid-feeding tube in the step (1) adjusts pH value for supplementing high-concentration alkali liquor.
It is as above-mentioned technical proposal to further describe:
The high-concentration alkali liquor is the NaOH solution of 3~5mol/L of concentration；It is described adjust pH value range be 12.5~
13.0。
It is as above-mentioned technical proposal to further describe:
The volume compression for the 1L under test gas being passed through is 350~500mL by compressor in the step (1).
It is as above-mentioned technical proposal to further describe:
The NaOH solution that reaction solution in the step (2) is 12~18 DEG C of temperature, pH is 13.0.
It is as above-mentioned technical proposal to further describe:
The pH value of venting process is reduced to 7.5~8.5 in the step (3).
It is as above-mentioned technical proposal to further describe:
The pH value is equal with the pH of reaction solution in step (2) after adjusting pH in the step (4).
It is as above-mentioned technical proposal to further describe:
Relative air humidity in the step (5) in reactor is 55~65%.
It is as above-mentioned technical proposal to further describe:
Step (2)~(5) are stirring at low speed for 20~40r/min with blender rate.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
(1) present invention subsequently enters lye and is absorbed, so that the pH value of lye is able to by compressing to air to be measured
Decline, after decline to a certain extent, resulting ph can carry out the calculating of content, and it is next that the progress of high-concentration alkali liquor heightening pH is added
Secondary measurement in the process compresses gas pressurized to be measured, convenient for improving the partial pressure with reaction solution effect, accelerates titanium dioxide
Sulphur is converted into sulfurous acid by the rate of lye institute stable absorption, and with lower temperature and stirs at low speed, and can promote SO2
Gas it is evenly dispersed it is absorbed simultaneously, avoid because the sulfurous acid concentration being locally generated is excessively high cause gas be detached from reaction solution,
In addition, the adjustment process that timely alkalizes, can also promote the ionization of sulfurous acid, ensure reaction solution to SO2The stabilization that gas receives
Property, it avoids influencing the micrometric measurement in detection process because of gas evolution, convenient for preferably completing detection, the present invention passes through acidity
Influence of the gaseous sulfur dioxide to lye pH obtains the amount of sulfurous acid in conjunction with the accurate measurement to pH with the variation of pH value, into
And the content of sulfur dioxide in preliminary survey air to be measured is obtained, the sulfur dioxide gas that then present invention is absorbed reaction solution heats
Export, and accelerates process react under excessive hydrogen sulfide again certain air humidity, obtains sulphur simple substance, progress repetition measurement titanium dioxide
The gas content of preliminary survey and repetition measurement is finally averaged and is contained to get the sulfur dioxide gas of the under test gas by sulphur gas content
Amount；
(2) in air provided by the invention sulfur dioxide gas detection method, it is low in cost, it is easy to operate, and have
There are the coherent degree of operation well and convenience strong, can easily complete repeatedly to measure, and can be by titanium dioxide after final test
Sulphur is converted into sulphur simple substance, convenient for the reasonable preservation and recycling to sulfur-bearing ingredient, and possesses preliminary survey, repetition measurement double shield,
Measurement sulfur dioxide gas content well, the relative error magnitudes of Examples 1 to 3 are smaller than comparative example 1 as shown in Table 1, can
See that the accuracy that measures of the present invention is higher than 1 method therefor of comparative example, in addition, the relative error of embodiment 3 is most in Examples 1 to 3
Small, measured value is the most accurate, is the optimum embodiment in three, and present invention measurement is accurate, easy to operate, has application well
Prospect.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
The measuring method of sulfur dioxide gas content, the measuring method include the following steps: in a kind of air
(1) functional instrument is set: Accurate pH digital display instrument, liquid-feeding tube, temperature controller, blender are set in sealing reactor；
(2) ventilation detection: 1L air to be measured is blasted in the closed reaction vessel equipped with reaction solution with air blower, compression should
It is passed through reaction solution after under test gas, reacting liquid pH value variation is detected；
(3) content preliminary survey: it is down to a certain range to reacting liquid pH value in venting process, carries out the calculating of assay；
(4) it heats air guide: completing after calculating, regulate and control the temperature controller in reaction solution and be warming up to 80~95 DEG C, export SO2Gas
Body, the pH of reaction solution after adjusting processing；
(5) sulphur processed is restored: by derived SO2Gas 1:3~7 and H by volume2S gas reacts in the reactor, generates S
Simple substance；
(6) content repetition measurement: by the content of sulfur dioxide in the quality repetition measurement air to be measured of S simple substance；
(7) content obtained by step (3) and step (6) data conclusion: is calculated into average value to get sulfur dioxide gas in air
Body content.
PH value of the Accurate pH digital display instrument to detect reaction solution in time in step (1), convenient for showing that pH value is calculated
With adjusting pH.
Liquid-feeding tube in step (1) adjusts pH value for supplementing high-concentration alkali liquor, and high-concentration alkali liquor is 3~5mol/L of concentration
NaOH solution；The range for adjusting pH value is 12.5~13.0.
The volume compression for the 1L under test gas being passed through is 350~500mL by compressor in step (1).
The NaOH solution that reaction solution in step (2) is 12~18 DEG C of temperature, pH is 13.0.
The pH value of venting process is reduced to 7.5~8.5 in step (3).
The pH value is equal with the pH of reaction solution in step (2) after adjusting pH in step (4).
Relative air humidity in step (5) in reactor is 55~65%.
Step (2)~(5) are stirring at low speed for 20~40r/min with rate.
Embodiment 1
The measuring method of sulfur dioxide gas content, the measuring method include the following steps: in a kind of air
(1) functional instrument is set: Accurate pH digital display instrument, liquid-feeding tube, temperature controller, blender are set in sealing reactor；
(2) ventilation detection: 1L air to be measured is blasted in the closed reaction vessel equipped with reaction solution with air blower, compression should
It is passed through reaction solution after under test gas, reacting liquid pH value variation is detected；
(3) content preliminary survey: it is down to a certain range to reacting liquid pH value in venting process, carries out the calculating of assay；
(4) it heats air guide: completing after calculating, regulate and control the temperature controller in reaction solution and be warming up to 85 DEG C, export SO2Gas is adjusted
The pH of reaction solution after section processing；
(5) sulphur processed is restored: by derived SO2Gas 1:7 and H by volume2S gas reacts in the reactor, and it is mono- to generate S
Matter；
(6) content repetition measurement: by the content of sulfur dioxide in the quality repetition measurement air to be measured of S simple substance；
(7) content obtained by step (3) and step (6) data conclusion: is calculated into average value to get sulfur dioxide gas in air
Body content.
PH value of the Accurate pH digital display instrument to detect reaction solution in time in step (1), convenient for showing that pH value is calculated
With adjusting pH.
Liquid-feeding tube in step (1) adjusts pH value for supplementing high-concentration alkali liquor, and high-concentration alkali liquor is concentration 5mol/L's
NaOH solution；The range for adjusting pH value is 12.8.
The volume compression for the 1L under test gas being passed through is 500mL by compressor in step (1).
The NaOH solution that reaction solution in step (2) is 18 DEG C of temperature, pH is 13.0.
The pH value of venting process is reduced to 7.9 in step (3).
The pH value is equal with the pH of reaction solution in step (2) after adjusting pH in step (4).
Relative air humidity in step (5) in reactor is 56%.
Step (2)~(5) are stirring at low speed for 30r/min with rate.
Embodiment 2
The measuring method of sulfur dioxide gas content, the measuring method include the following steps: in a kind of air
(1) functional instrument is set: Accurate pH digital display instrument, liquid-feeding tube, temperature controller, blender are set in sealing reactor；
(2) ventilation detection: 1L air to be measured is blasted in the closed reaction vessel equipped with reaction solution with air blower, compression should
It is passed through reaction solution after under test gas, reacting liquid pH value variation is detected；
(3) content preliminary survey: it is down to a certain range to reacting liquid pH value in venting process, carries out the calculating of assay；
(4) it heats air guide: completing after calculating, regulate and control the temperature controller in reaction solution and be warming up to 80 DEG C, export SO2Gas is adjusted
The pH of reaction solution after section processing；
(5) sulphur processed is restored: by derived SO2Gas 1:4 and H by volume2S gas reacts in the reactor, and it is mono- to generate S
Matter；
(6) content repetition measurement: by the content of sulfur dioxide in the quality repetition measurement air to be measured of S simple substance；
(7) content obtained by step (3) and step (6) data conclusion: is calculated into average value to get sulfur dioxide gas in air
Body content.
PH value of the Accurate pH digital display instrument to detect reaction solution in time in step (1), convenient for showing that pH value is calculated
With adjusting pH.
Liquid-feeding tube in step (1) adjusts pH value for supplementing high-concentration alkali liquor, and high-concentration alkali liquor is concentration 4mol/L's
NaOH solution；The range for adjusting pH value is 12.8.
The volume compression for the 1L under test gas being passed through is 370mL by compressor in step (1).
The NaOH solution that reaction solution in step (2) is 13 DEG C of temperature, pH is 13.0.
The pH value of venting process is reduced to 8.2 in step (3).
The pH value is equal with the pH of reaction solution in step (2) after adjusting pH in step (4).
Relative air humidity in step (5) in reactor is 55%.
Step (2)~(5) are stirring at low speed for 40r/min with rate.
Embodiment 3
The measuring method of sulfur dioxide gas content, the measuring method include the following steps: in a kind of air
(1) functional instrument is set: Accurate pH digital display instrument, liquid-feeding tube, temperature controller, blender are set in sealing reactor；
(2) ventilation detection: 1L air to be measured is blasted in the closed reaction vessel equipped with reaction solution with air blower, compression should
It is passed through reaction solution after under test gas, reacting liquid pH value variation is detected；
(3) content preliminary survey: it is down to a certain range to reacting liquid pH value in venting process, carries out the calculating of assay；
(4) it heats air guide: completing after calculating, regulate and control the temperature controller in reaction solution and be warming up to 95 DEG C, export SO2Gas is adjusted
The pH of reaction solution after section processing；
(5) sulphur processed is restored: by derived SO2Gas 1:6 and H by volume2S gas reacts in the reactor, and it is mono- to generate S
Matter；
(6) content repetition measurement: by the content of sulfur dioxide in the quality repetition measurement air to be measured of S simple substance；
(7) content obtained by step (3) and step (6) data conclusion: is calculated into average value to get sulfur dioxide gas in air
Body content.
PH value of the Accurate pH digital display instrument to detect reaction solution in time in step (1), convenient for showing that pH value is calculated
With adjusting pH.
Liquid-feeding tube in step (1) adjusts pH value for supplementing high-concentration alkali liquor, and high-concentration alkali liquor is concentration 5mol/L's
NaOH solution；The range for adjusting pH value is 12.5.
The volume compression for the 1L under test gas being passed through is 400mL by compressor in step (1).
The NaOH solution that reaction solution in step (2) is 16 DEG C of temperature, pH is 13.0.
The pH value of venting process is reduced to 7.8 in step (3).
The pH value is equal with the pH of reaction solution in step (2) after adjusting pH in step (4).
Relative air humidity in step (5) in reactor is 65%.
Step (2)~(5) are stirring at low speed for 25r/min with rate.
Comparative example 1 is using the measuring method announced in patent CN201711204987.9.
The present invention uses the side for carrying out Examples 1 to 3 and comparative example 1 respectively for 20% air to be measured containing amount of sulfur dioxide
Method is measured, and relative error=(20%-measures SO2Gas content)/20%, acquired results are as shown in table 1:
Table 1, sulfur dioxide gas content survey table
The relative error magnitudes of Examples 1 to 3 are smaller than comparative example 1 as shown in Table 1, it is seen that the accuracy that the present invention measures
Higher than 1 method therefor of comparative example, in addition, the relative error of embodiment 3 is minimum in Examples 1 to 3, measured value is the most accurate, is
Optimum embodiment in three.Present invention measurement is accurate, easy to operate, has a good application prospect.
Any technical solution disclosed in aforementioned present invention unless otherwise stated, if it discloses numberical range,
Disclosed numberical range is preferred numberical range, and any it should be appreciated by those skilled in the art preferred numberical ranges
The only obvious or representative numerical value of technical effect in many enforceable numerical value.It, can not since numerical value is more
Exhaustion, so the present invention just discloses technical solution of the component values to illustrate the present invention, also, the above-mentioned numerical value enumerated is not
The limitation to the invention protection scope should be constituted.
Claims (10)
1. the measuring method of sulfur dioxide gas content in a kind of air, which is characterized in that the measuring method includes the following steps:
(1) functional instrument is set: Accurate pH digital display instrument, liquid-feeding tube, temperature controller, blender are set in sealing reactor；
(2) ventilation detection: 1L air to be measured is blasted in the closed reaction vessel equipped with reaction solution with air blower, it is to be measured to compress this
It is passed through reaction solution after gas, reacting liquid pH value variation is detected；
(3) content preliminary survey: it is down to a certain range to reacting liquid pH value in venting process, carries out the calculating of assay；
(4) it heats air guide: completing after calculating, regulate and control the temperature controller in reaction solution and be warming up to 80~95 DEG C, export SO2Gas is adjusted
The pH of reaction solution after processing；
(5) sulphur processed is restored: by derived SO2Gas 1:3~7 and H by volume2S gas reacts in the reactor, generates sulphur list
Matter；
(6) content repetition measurement: by the content of sulfur dioxide in the quality repetition measurement air to be measured of sulphur simple substance；
(7) data conclusion: content obtained by step (3) and step (6) is calculated into average value and is contained to get sulfur dioxide gas in air
Amount.
2. according to claim 1 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that the step
Suddenly pH value of the Accurate pH digital display instrument in (1) to detect reaction solution in time, convenient for showing that pH value is calculated and adjusted pH.
3. according to claim 1 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that the step
Suddenly the liquid-feeding tube in (1) adjusts pH value for supplementing high-concentration alkali liquor.
4. according to claim 3 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that the height
Concentration lye is the NaOH solution of 3~5mol/L of concentration；The range for adjusting pH value is 12.5~13.0.
5. according to claim 1 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that the step
Suddenly the volume compression for the 1L under test gas being passed through is 350~500mL by the compressor in (1).
6. according to claim 1 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that the step
Suddenly the NaOH solution that the reaction solution in (2) is 12~18 DEG C of temperature, pH is 13.0.
7. according to claim 1 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that the step
Suddenly the pH value of venting process is reduced to 7.5~8.5 in (3).
8. according to claim 1 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that the step
Suddenly the pH value is equal with the pH of reaction solution in step (2) after the adjusting pH in (4).
9. according to claim 1 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that the step
Suddenly the relative air humidity in (5) in reactor is 55~65%.
10. according to claim 1 in a kind of air sulfur dioxide gas content measuring method, which is characterized in that it is described
Adjoint rate is stirring at low speed for 20~40r/min during step (2)~(5).
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