CN104297190A - Determining method of COD of paper waste water - Google Patents
Determining method of COD of paper waste water Download PDFInfo
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- CN104297190A CN104297190A CN201310299105.7A CN201310299105A CN104297190A CN 104297190 A CN104297190 A CN 104297190A CN 201310299105 A CN201310299105 A CN 201310299105A CN 104297190 A CN104297190 A CN 104297190A
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Abstract
The invention provides a determining method of COD of paper waste water. The method includes following steps: (1) determining an ultraviolet maximum absorption wavelength of to-be-tested paper waste water; (2) drawing a correlation curve of (A maximum absorption wavelength - A546) absorbance to the COD; and (3) preparing to-be-tested paper waste water again, and determining the COD of the to-be-tested paper waste water according to the A maximum absorption wavelength of the absorbance under the ultraviolet maximum absorption wavelength of the to-be-tested paper waste water and the absorbance value A546 under an 546 nm visible light wavelength and according to the correlation curve drawn in the step (2). The determining method is simple in operation, is free of a large amount of repeatability test processes, is reduced in determining time and is free of secondary pollution caused by usage of chemical reagents for detection.
Description
Technical field
The present invention relates to a kind of method measuring paper waste chemical oxygen demand (COD), particularly relate to a kind of method adopting double-wavelength spectroscopy to measure chemical oxygen demand (COD).
Background technology
Chemical oxygen demand (COD) (Chemical Oxygen Demand, be called for short COD) to refer in water body the reducing substances be easily oxidized by strong oxidizer the amount of oxygenant that consumes, result is converted to the amount (in mg/L) of oxygen.It characterizes the overall target of water body by reducing substances pollution, is the important parameter of Water Quality Evaluation.The standard method that China measures COD is GB 11914-89 " the mensuration dichromate titration of water chemical oxygen demand " and HJ/T399-2007 " the mensuration rapid-digestion spectrophotometric method of water chemical oxygen demand ", and these two kinds of methods are also internationally recognized detection methods.But be that dichromate titration or spectrophotometric method all need to heat 2 hours under strongly acidic conditions, and all will use the chemical reagent such as mercuric sulfate, potassium dichromate and the concentrated sulphuric acid, test period is longer, can cause serious secondary pollution.
Organism containing conjugated double bond or phenyl ring has obvious absorption peak in ultraviolet region, for the water sample that some component is single and stable, absorbance under specific UV wavelength and between COD, there is good correlativity, therefore can by measuring the approximate evaluation of the absorbance of water sample under specific UV wavelength as COD, thus replace loaded down with trivial details COD to measure, greatly shorten Measuring Time, simplify the operation course, avoid the secondary pollution of chemical reagent.
Due to the change that ultraviolet spectrophotometry is by light intensity after test ultraviolet light transmission water sample, and measure the content of organic substance, the suspension in water can to through light produce scattering or absorption, therefore directly can affect the accuracy of mensuration.Adopt visible ray as reference wavelength, the impact of suspension on ultraviolet absorptivity can be eliminated, thus improve measurement accuracy.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind ofly can avoid secondary pollution and can the method for Fast Measurement paper waste chemical oxygen demand (COD).
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
An assay method for paper waste chemical oxygen demand (COD), is characterized in that comprising the following steps:
1) ultraviolet maximum absorption wavelength of paper waste to be measured is determined;
2) by after paper waste to be measured dilution different multiples, its absorbance A under ultraviolet maximum absorption wavelength is measured respectively
maximum absorption wavelengthwith the absorbance A under 546nm visible wavelength
546, measure the COD content of water sample simultaneously according to standard HJ/T399-2007, draw (A
maximum absorption wavelength-A
546) correlation curve between absorbance and COD, the absorbance A under described ultraviolet maximum absorption wavelength
maximum absorption wavelengthbe less than 1.5;
3) paper waste to be measured is again got, according to the absorbance A under the ultraviolet maximum absorption wavelength of paper waste to be measured
maximum absorption wavelengthwith the absorbance A under 546nm visible wavelength
546and according to step 2) described correlation curve determines the chemical oxygen demand (COD) of paper waste to be measured.
The concentration of paper waste is different, the absorbance A under ultraviolet maximum absorption wavelength
maximum absorption wavelengthalso can change thereupon, when the absorbance under ultraviolet maximum absorption wavelength is less than 1.5, between absorbance and COD, higher correlativity could be kept.
The present invention adopts double-wavelength spectroscopy, namely by measuring the absorbance under its maximum absorption wavelength and maximum absorption wavelength and the absorbance under 546nm wavelength, draw the linearity curve between absorbance and chemical oxygen demand (COD), in daily testing, namely the absorbance only need measuring tested paper waste draws the chemical oxygen demand (COD) of this sample by this linear relationship.The method is simple to operate, avoids a large amount of replica test step, shortens Measuring Time, avoids and uses chemical reagent to carry out detecting the secondary pollution caused.
Through great many of experiments, as the absorbance A under ultraviolet maximum absorption wavelength
maximum absorption wavelengthwhen being 1.0 ~ 1.3, between absorbance and COD, higher correlativity can be kept.
The present invention adopts double-wavelength spectroscopy, namely by measuring the absorbance under its maximum absorption wavelength and maximum absorption wavelength and the absorbance under 546nm wavelength, draw the linearity curve between absorbance and chemical oxygen demand (COD), in daily testing, namely the absorbance only need measuring tested paper waste draws the chemical oxygen demand (COD) of this sample by this linear relationship.The method is simple to operate, avoids a large amount of replica test step, shortens Measuring Time, avoids and uses chemical reagent to carry out detecting the secondary pollution caused.In addition, the present invention is diluted to different multiples according to the concentration of tested paper waste, the absorbance of maximum absorption wavelength is made to be less than 1.5, now, maintain higher linear dependence between the absorbance of tested paper waste sample and its chemical oxygen demand (COD), the chemical oxygen demand (COD) measured in this case has higher degree of accuracy.
Accompanying drawing explanation
Fig. 1 is the uv-vis spectra of embodiment 1 paper-making pulping waste water;
Fig. 2 is the correlation curve of embodiment 1 paper-making pulping waste water absorbance and COD;
Fig. 3 is the uv-vis spectra of embodiment 2 paper waste;
Fig. 4 is the correlation curve of embodiment 2 paper-making pulping waste water absorbance and COD.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further details.
Embodiment 1:
1) ultraviolet maximum absorption wavelength of tested paper waste is determined
For Guangxi pulp mill paper waste sample, water analysis is in table 1.This waste water is carried out length scanning, determines maximum absorption wavelength, see Fig. 1.As seen from Figure 1, there is maximum absorption band at 200 ~ 220nm and 272nm wave band place in water sample, but the absorption peak produced under 200 ~ 220nm wave band causes because instrument exists end absorbing phenomenon, and the peak that this wave band produces can not as maximum absorption band.Therefore can determine that the ultraviolet maximum absorption wavelength of this waste water is 272nm, the absorbance under this wavelength is 1.169.
Table 1 paper waste water-quality guideline
2) correlation curve of absorbance and COD is determined
By the paper waste water sample dilution different multiples in step 1), as 300 times, 200 times, 100 times, 50 times etc., the A of waste water after dilution
272should 1.5 be less than, measure its absorbance under 272nm and 546nm, measure the COD content of water sample simultaneously according to the method for defined in standard HJ/T399-2007.With (A
272-A
546) be horizontal ordinate, using water sample COD value as ordinate, carry out linear fit, obtain the correlation curve equation (COD=399.23 × (A between absorbance and COD
272-A
546)-12.98, R
2=0.9958), curvilinear equation is shown in Fig. 2.The relative coefficient of equation reaches 0.9958, and illustrate to have higher correlativity between the absorbance of water sample and COD, the fitness of equation is better.
3) mensuration of chemical oxygen demand (COD)
Again paper waste to be measured is got, according to the absorbance A under the ultraviolet maximum absorption wavelength of paper waste to be measured
maximum absorption wavelengthwith the absorbance A under 546nm visible wavelength
546and according to step 2) correlation curve drawn calculates the chemical oxygen demand (COD) of paper waste to be measured.
Embodiment 2 measurement result accuracy test
Adopt method described in embodiment 1, get 5 water samples from this pulp mill at different time, it is diluted different multiples respectively, adopt HJ/T399-2007 and double-wavelength spectroscopy to measure COD value respectively, the results are shown in Table 2.Waste water double-wavelength scan method measurement result is slightly less than the measurement result of standard method, this is that what mainly to reflect due to double-wavelength scan method gained COD value is reducible organic content in water sample, and standard method gained COD value not only comprises reducible organic content, also comprise the content of reducible inorganics.Double-wavelength spectroscopy is compared with standard method, and relative deviation is less, and measuring error is less than ± and 15%.
Table 2 double-wavelength scan method compares with COD standard method of test
Embodiment 3:
1) ultraviolet maximum absorption wavelength of waste water is determined
For paper mill, Shandong paper waste, water analysis is in table 3.This waste water is carried out length scanning, determines maximum absorption wavelength, see Fig. 3.As seen from Figure 3, there is maximum absorption band at 203nm and 265nm place in water sample, it is generally acknowledged that the absorption peak produced under 203nm wavelength causes because instrument exists end absorbing phenomenon, and the peak that this wave band produces can not as maximum absorption band.Therefore can determine that the ultraviolet maximum absorption wavelength of this waste water is 265nm, the absorbance under this wavelength is 0.62.
Table 3 waste water quality index
2) correlation curve of absorbance and COD is determined
Water sample is diluted to different multiples, as 300 times, 200 times, 100 times, 50 times etc., the A of waste water after dilution
265should 1.5 be less than, measure its absorbance under 265nm and 546nm, measure the COD content of water sample simultaneously according to standard HJ/T399-2007.With (A
265-A
546) be horizontal ordinate, using water sample COD value as ordinate, carry out linear fit, obtain the correlation curve equation (COD=173.57 × (A between absorbance and COD
265-A
546)-8.56, R
2=0.9971), curvilinear equation is shown in Fig. 4.The relative coefficient of equation reaches 0.9971, and illustrate to have higher correlativity between the absorbance of water sample and COD, the fitness of equation is better.
3) mensuration of chemical oxygen demand (COD)
Again paper waste to be measured is got, according to the absorbance A under the ultraviolet maximum absorption wavelength of paper waste to be measured
maximum absorption wavelengthwith the absorbance A under 546nm visible wavelength
546and according to step 2) correlation curve drawn calculates the chemical oxygen demand (COD) of paper waste to be measured.
Embodiment 4 measurement result accuracy test
Adopt the method described in embodiment 3, get 5 water samples from this paper mill at different time, it is diluted different multiples respectively, adopt HJ/T399-2007 and double-wavelength spectroscopy to measure COD value respectively, the results are shown in Table 3.Double-wavelength spectroscopy is compared with standard method, and relative deviation is less, and measuring error is less than ± and 15%.
Table 4 double-wavelength scan method compares with COD standard method of test
Claims (2)
1. an assay method for paper waste chemical oxygen demand (COD), is characterized in that comprising the following steps:
1) ultraviolet maximum absorption wavelength of paper waste to be measured is determined;
2) by after paper waste to be measured dilution different multiples, its absorbance A under ultraviolet maximum absorption wavelength is measured respectively
maximum absorption wavelengthwith the absorbance A under 546nm visible wavelength
546, measure the COD content of water sample simultaneously according to standard HJ/T399-2007, draw A
maximum absorption wavelength-A
546correlation curve between absorbance and COD, the absorbance A under described ultraviolet maximum absorption wavelength
maximum absorption wavelengthbe less than 1.5;
3) paper waste to be measured is again got, according to the absorbance A under the ultraviolet maximum absorption wavelength of paper waste to be measured
maximum absorption wavelengthwith the absorbance A under 546nm visible wavelength
546and according to step 2) described correlation curve determines the chemical oxygen demand (COD) of paper waste to be measured.
2. the assay method of paper waste chemical oxygen demand (COD) according to claim 1, is characterized in that, the absorbance A under described ultraviolet maximum absorption wavelength
maximum absorption wavelengthbe 1.0 ~ 1.3.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018072201A1 (en) * | 2016-10-21 | 2018-04-26 | Honeywell International Inc. | Compact ultraviolet light adsorption sensing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018072201A1 (en) * | 2016-10-21 | 2018-04-26 | Honeywell International Inc. | Compact ultraviolet light adsorption sensing system |
| US10823670B2 (en) | 2016-10-21 | 2020-11-03 | Honeywell International Inc. | Compact ultraviolet light adsorption sensing system |
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