CN113740321A - Method for detecting barium content in coating of cold-rolled electroplated tin steel plate - Google Patents
Method for detecting barium content in coating of cold-rolled electroplated tin steel plate Download PDFInfo
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- CN113740321A CN113740321A CN202010479259.4A CN202010479259A CN113740321A CN 113740321 A CN113740321 A CN 113740321A CN 202010479259 A CN202010479259 A CN 202010479259A CN 113740321 A CN113740321 A CN 113740321A
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- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 229910052788 barium Inorganic materials 0.000 title claims abstract description 106
- 239000011248 coating agent Substances 0.000 title claims abstract description 39
- 238000000576 coating method Methods 0.000 title claims abstract description 39
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000523 sample Substances 0.000 claims abstract description 91
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 230000003595 spectral effect Effects 0.000 claims abstract description 28
- 239000012488 sample solution Substances 0.000 claims abstract description 17
- 238000009616 inductively coupled plasma Methods 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims description 45
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 239000012086 standard solution Substances 0.000 claims description 12
- 238000007747 plating Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 9
- 238000001228 spectrum Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000012417 linear regression Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000005201 scrubbing Methods 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 239000005028 tinplate Substances 0.000 description 11
- 239000010410 layer Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 3
- 229910001863 barium hydroxide Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000004876 x-ray fluorescence Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- VFCOFVYJPYZQHE-UHFFFAOYSA-J barium(2+) lead(2+) tetrahydroxide Chemical compound [OH-].[Pb+2].[Ba+2].[OH-].[OH-].[OH-] VFCOFVYJPYZQHE-UHFFFAOYSA-J 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/73—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited using plasma burners or torches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The invention discloses a method for detecting barium content in a coating of a cold-rolled tin-plated steel plate, which mainly solves the technical problem that the barium content in the coating of the existing cold-rolled tin-plated steel plate cannot be accurately detected. The invention discloses a method for detecting the content of barium in a coating of a cold-rolled electroplated tin steel plate, which comprises the following steps: 1) preparing a sample; 2) electrolytic detinning is carried out on the sample; 3) preparing a sample solution to be detected; 4) detecting the spectral intensity of barium in the sample, and measuring the spectral intensity I of barium in the sample solution to be detected by adopting an inductively coupled plasma emission spectrometerBa(ii) a 5) Calculating the mass of the barium element in the sample solution to be detected; 6) and calculating the barium content in the coating of the cold-rolled electroplated tin steel plate. The method realizes quantitative detection of the barium content in the coating of the cold-rolled electroplated tin steel plate, and has the advantages of simple and convenient operation, short detection time, strong operability and accurate and reliable detection data; the method of the invention reduces the use of chemical reagents, greatly reduces the discharge of chemical pollutants, and reduces the danger to human bodies and environmentAnd (4) harming.
Description
Technical Field
The invention relates to a method for detecting the content of chemical elements in a coating of an electrotinning steel plate, in particular to a method for detecting the content of barium in the coating of a cold-rolled electrotinning steel plate, and belongs to the technical field of cold-rolled surface chemical analysis.
Background
The cold-rolled electroplated tin steel plate is a main packaging material in the food packaging industry, the quality requirement on the tin plate is continuously increased along with the increasing improvement of the living standard of people, particularly the quality requirement on harmful elements in a plating layer is higher and higher, for example, the content of lead in a tin layer of a tin plating product specified in European Union standard 'EN 10333-2005 packaging steel-flat steel products expected to be used for food or beverage contacting human and animal diets-tin plate'. In order to control the lead content in the plating layer of the electroplated tin plate to be below 0.01 percent, part of domestic cold-rolled tin plating manufacturers gradually adopt a barium hydroxide method to reduce the lead content in the plating layer, the lead content in the plating layer is obviously reduced, but at the same time, a small amount of barium element is electroplated into the plating layer of the electroplated tin plate. In order to realize accurate control of barium element in the tin plate coating, the content of barium element in the cold-rolled tin plate coating needs to be accurately detected.
The barium element is an element brought into the coating by a later process, is a special phenomenon of adopting a barium hydroxide lead reduction process, and no relevant report about the detection of the barium element in the tin coating of the cold-rolled electroplated tin plate exists in the prior art.
The Chinese patent application with application publication number CN102998353A discloses an automatic test device for processing lead determination samples in a tin plate coating, which adopts an electrolytic bath to contain stripping liquid and electrically strip a tin coating.
Chinese patent application publication No. CN102997832A discloses an automatic measuring system for an oxide film coating on the surface of a tin plate, which adopts stripping liquid contained in an electrolytic bath to strip a tin coating by electrifying, thereby measuring the amount of the oxide film. The invention detects the amount of the oxide film in the tin coating layer instead of the barium content.
The Chinese patent application with application publication number CN107991332A discloses a method for rapidly and semi-quantitatively detecting the barium content in a pyrotechnic blind sample for fireworks and crackers, which comprises the steps of dissecting a pyrotechnic sample from a firework and cracker product, grinding, sieving, drying, cooling to room temperature, establishing an analysis method by using an energy dispersion type X-ray fluorescence spectrometer as a detection instrument by adopting an intensity method, putting the sample into an instrument sample cup, putting the sample to be detected into a test chamber of the energy dispersion type X-ray fluorescence spectrometer, recording a fluorescence intensity value of a barium element characteristic spectrum line displayed on the instrument, estimating the content of the barium element in the sample, and further selecting a proper analysis instrument to accurately and quantitatively analyze the barium content in the pyrotechnic sample for fireworks and crackers, wherein the detected content is the barium content in powder and the barium content in a non-coating layer.
At present, no detection technology for barium content in the coating of the cold-rolled electroplated tin steel plate exists in the industry.
Disclosure of Invention
The invention aims to provide a method for detecting the barium content in a coating of a cold-rolled tin-plated steel plate, which mainly solves the technical problem that the barium content in the coating of the existing cold-rolled tin-plated steel plate cannot be accurately detected.
The invention adopts the technical scheme that the method for detecting the barium content in the coating of the cold-rolled electrotinning steel plate comprises the following steps:
1) preparing a sample, continuously intercepting six samples with the same size on a rustless and pollution-free cold-rolled tin-plated steel plate to be detected, wherein the sample comprises a detection part and a clamping part, the clamping part is connected with the outer side of the long edge of the detection part, the size of the clamping part of the sample is 20mm multiplied by 10mm, the size of the detection part of the sample is 180mm multiplied by 40mm, the non-measurement surface of the detection part of the sample is sealed by an acid and alkali resistant adhesive tape, and the six samples are respectively marked as sample 1, sample 2, sample 3, sample 4, sample 5 and sample 6; scrubbing the measuring surface of the sample detecting part with absolute ethyl alcohol, and drying;
2) carrying out electrolytic detinning on a sample, and adding 200-250 mL of dilute hydrochloric acid solution with the mass volume concentration of 108-132 g/L into a beaker with the volume of 400 mL; placing a platinum wire mesh in a dilute hydrochloric acid solution in a beaker, completely immersing a detection part of a sample 1 in the dilute hydrochloric acid solution in the beaker, enabling direct current to perform electrolytic detinning on the sample 1 by taking the sample 1 as a cathode and the platinum wire mesh as an anode, and taking the sample 1 out of the dilute hydrochloric acid solution in the beaker after detinning, wherein the electrified detinning time is 30-120 s; sequentially placing the samples 2-5 in a solution in a beaker, and sequentially carrying out detinning treatment on the samples 2-5 according to the detinning mode of the sample 1; finally, placing the sample 6 in the solution in the beaker, carrying out detinning treatment on the sample 6 according to the detinning mode of the sample 1, taking the sample 6 and the platinum wire mesh out of the solution in the beaker after the detinning of the sample 6 is finished, and reserving the solution in the beaker;
3) preparing a sample solution to be detected, heating and evaporating the solution in the beaker to be within 30mL, transferring the solution in the beaker to a 50mL volumetric flask, and carrying out constant volume treatment to 50mL by using deionized water to obtain the sample solution to be detected;
4) detecting the spectral intensity of barium in the sample, and measuring the spectral intensity I of barium in the sample solution to be detected by adopting an inductively coupled plasma emission spectrometerBa；
5) Calculating the mass of barium in the sample solution to be measured according to formula I, C1＝a+b×IBaFormula I, formula I wherein C1Is the mass of barium element, and the unit is ug; a is the background equivalent concentration in ug; b is the conversion of the spectral intensity of barium to mass, and the unit is ug/cps; i isBaThe spectrum intensity of barium in the solution to be measured is cps. The background equivalent concentration a and the conversion b of the spectral intensity of barium to the mass are determined by a working curve equation of the relationship between the mass of barium in the barium standard solution and the spectral intensity of barium, and specifically are as follows: accurately transferring 0, 1.00, 3.00, 5.00, 7.00, 9.00 and 10.00mL of barium standard solution with the mass volume concentration of 5ug/mL into 7 50mL volumetric flasks by using a pipette, and adding the barium standard solution with the volume concentration of 1: 2-1: 5, adding deionized water to constant volume of 50mL, shaking up, and measuring the spectral intensity I of barium at 455.4nm wavelength by using an inductively coupled plasma emission spectrometerBaCalculating the unary linear regression equation m of the working curve of the relation between the mass of barium in the barium standard solution and the spectral intensity of bariumBaDetermining a value a and a value b by a formula II; in the formula II, m is the mass of barium in the determination solution and the unit is ug; a is the background equivalent concentration in ug; b is conversion of barium spectrum intensity to mass, and the unit is ug/cps; i isBaIs the barium spectral intensity in cps;
6) calculating the barium content in the coating of the cold-rolled electroplated tin steel plate according to a formula III, and CBa％＝(C1×10-6) /(A × S) × 100% formula three, in formula three, CBa% is the barium content in unit area in the sample coating; c1The unit is ug which is the mass of the barium element in the solution to be measured; a is the theoretical tin plating amount of the measuring surface of the sample detection part and the unit is g/m2(ii) a S is the sum of the areas of the measuring surfaces of the detecting parts of the samples 1 to 6, and the unit is m2。
Further, when the wavelength of the inductively coupled plasma emission spectrometer in the step 4) is 455.4nm, the spectral intensity I of barium in the sample solution to be measured is measuredBaThe effect is good.
The method is based on the composition of barium in the tin coating of the tin plate and the solubility difference in different media, takes a dilute hydrochloric acid solution as an electrolytic tin-removing solution, strips all barium in the tin coating into the solution, detects barium by an ICP emission spectroscopy method, and divides the area of a sample and the unit area tin-plating amount of the tin plate to obtain the barium content in the unit area tin coating.
The method can accurately measure the barium content in the tin coating of the cold-rolled electroplated tin steel plate after the barium hydroxide method lead-reducing process is carried out.
The method realizes the accurate detection of the barium content in the tin coating of the tin-plated steel plate, provides conditions for the accurate regulation and control of the barium hydroxide lead-reducing process of the cold-rolled tin-plated steel plate, and is beneficial to the improvement of the surface quality of the cold-rolled tin-plated steel plate.
Compared with the prior art, the invention has the following positive effects: 1. the quantitative detection of the barium content in the coating of the cold-rolled electroplated tin steel plate has the advantages of simple and convenient operation, short detection time, strong operability and accurate and reliable detection data; 2. the method reduces the use of chemical reagents, can realize accurate detection by adopting conventional chemical reagents, greatly reduces the emission of chemical pollutants, and reduces the harm to human bodies and the environment.
Detailed Description
The invention is further illustrated below with reference to example 1.
Embodiment 1, a method for detecting the content of barium in a coating of a cold-rolled electroplated tin steel plate comprises the following steps:
1) preparing a sample, continuously intercepting six samples with the same size on a rustless and pollution-free cold-rolled tin-plated steel plate to be detected, wherein the sample comprises a detection part and a clamping part, the clamping part is connected with the outer side of the long edge of the detection part, the size of the clamping part of the sample is 20mm multiplied by 10mm, the size of the detection part of the sample is 180mm multiplied by 40mm, the non-measurement surface of the detection part of the sample is sealed by an acid and alkali resistant adhesive tape, and the six samples are respectively marked as sample 1, sample 2, sample 3, sample 4, sample 5 and sample 6; scrubbing the measuring surface of the sample detecting part with absolute ethyl alcohol, and drying;
2) carrying out electrolytic detinning on a sample, and adding 250mL of dilute hydrochloric acid solution with the mass volume concentration of 120g/L into a beaker with the volume of 400 mL; placing a platinum wire mesh in a dilute hydrochloric acid solution in a beaker, completely immersing a detection part of a sample 1 in the dilute hydrochloric acid solution in the beaker, enabling direct current to perform electrolytic detinning on the sample 1 by taking the sample 1 as a cathode and the platinum wire mesh as an anode, wherein the clamping part of the sample 1 is positioned above the liquid level of the dilute hydrochloric acid solution in the beaker, the electrified detinning time is 100s, taking the sample 1 out of the dilute hydrochloric acid solution in the beaker after detinning is finished, and keeping the solution in the beaker; sequentially placing the samples 2-5 in a solution in a beaker, and sequentially carrying out detinning treatment on the samples 2-5 according to the detinning mode of the sample 1; finally, placing the sample 6 in the solution in the beaker, carrying out detinning treatment on the sample 6 according to the detinning mode of the sample 1, taking the sample 6 and the platinum wire mesh out of the solution in the beaker after the detinning of the sample 6 is finished, and reserving the solution in the beaker;
3) preparing a sample solution to be detected, heating and evaporating the solution in the beaker to be within 30mL, transferring the solution in the beaker to a 50mL volumetric flask, and carrying out constant volume treatment to 50mL by using deionized water to obtain the sample solution to be detected;
4) detecting the spectral intensity of barium in the sample, and measuring the spectral intensity I of barium in the sample solution to be detected by adopting an inductively coupled plasma emission spectrometer at the wavelength of 455.4nmBa；
5) Calculating the mass of barium in the sample solution to be measured according to formula I, and C1＝a+b×IBaFormula I, formula I wherein C1Is the mass of barium element, and the unit is ug; a is the background equivalent concentration in ug; b is the conversion of the spectral intensity of barium to mass, and the unit is ug/cps; i isBaThe spectrum intensity of barium in the solution to be measured is cps. Back of bodyThe scene equivalent concentration a and the conversion b of the spectral intensity of barium to the mass are determined by a working curve equation of the relationship between the mass of barium in the barium standard solution and the spectral intensity of barium, and specifically comprise the following steps: accurately transferring 0, 1.00, 3.00, 5.00, 7.00, 9.00 and 10.00mL of barium standard solution with the mass volume concentration of 5ug/mL into 7 50mL volumetric flasks by using a pipette, and adding the barium standard solution with the volume concentration of 1: 2-1: 5, adding deionized water to constant volume of 50mL, shaking up, and measuring the spectral intensity I of barium at 455.4nm wavelength by using an inductively coupled plasma emission spectrometerBaCalculating the unary linear regression equation m of the working curve of the relation between the mass of barium in the barium standard solution and the spectral intensity of bariumBaDetermining a value a and a value b by a formula II; in the formula II, m is the mass of barium in the determination solution and the unit is ug; a is the background equivalent concentration in ug; b is conversion of barium spectrum intensity to mass, and the unit is ug/cps; i isBaIs the barium spectral intensity in cps;
6) calculating the barium content in the coating of the cold-rolled electroplated tin steel plate, calculating the barium content in the coating of the cold-rolled electroplated tin steel plate according to a formula III, and CBa％＝(C1×10-6) /(A × S) × 100% formula three, in formula three, CBa% is the barium content in unit area in the sample coating; c1The unit is ug which is the mass of the barium element in the solution to be measured; a is the theoretical tin plating amount of the measuring surface of the sample detection part and the unit is g/m2(ii) a S is the sum of the areas of the measuring surfaces of the detecting parts of the samples 1 to 6, and the unit is m2。
The method of the invention carries out precision tests, and the results are as follows:
the barium content in the coating of 3 groups of cold-rolled electroplated tin steel plates is tested for 9 times, and the analysis results are shown in the table.
Table 1 sample precision experimental units,%.
The experimental results show that the method for measuring the barium content in the coating of the cold-rolled electroplated tin steel plate has the Relative Standard Deviation (RSD) of less than 8.0 percent, has good precision of detection data and accurate and reliable method, and completely meets the detection control requirement of the barium content in the coating of the cold-rolled electroplated tin steel plate.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (2)
1. A method for detecting the content of barium in a coating of a cold-rolled electroplated tin steel plate is characterized by comprising the following steps:
1) preparing a sample, continuously intercepting six samples with the same size on a rustless and pollution-free cold-rolled tin-plated steel plate to be detected, wherein the sample comprises a detection part and a clamping part, the clamping part is connected with the outer side of the long edge of the detection part, the size of the clamping part of the sample is 20mm multiplied by 10mm, the size of the detection part of the sample is 180mm multiplied by 40mm, the non-measurement surface of the detection part of the sample is sealed by an acid and alkali resistant adhesive tape, and the six samples are respectively marked as sample 1, sample 2, sample 3, sample 4, sample 5 and sample 6; scrubbing the measuring surface of the sample detecting part with absolute ethyl alcohol, and drying;
2) carrying out electrolytic detinning on a sample, and adding 200-250 mL of dilute hydrochloric acid solution with the mass volume concentration of 108-132 g/L into a beaker with the volume of 400 mL; placing a platinum wire mesh in a dilute hydrochloric acid solution in a beaker, completely immersing a detection part of a sample 1 in the dilute hydrochloric acid solution in the beaker, enabling direct current to perform electrolytic detinning on the sample 1 by taking the sample 1 as a cathode and the platinum wire mesh as an anode, and taking the sample 1 out of the dilute hydrochloric acid solution in the beaker after detinning, wherein the electrified detinning time is 30-120 s; sequentially placing the samples 2-5 in a solution in a beaker, and sequentially carrying out detinning treatment on the samples 2-5 according to the detinning mode of the sample 1; finally, placing the sample 6 in the solution in the beaker, carrying out detinning treatment on the sample 6 according to the detinning mode of the sample 1, taking the sample 6 and the platinum wire mesh out of the solution in the beaker after the detinning of the sample 6 is finished, and reserving the solution in the beaker;
3) preparing a sample solution to be detected, heating and evaporating the solution in the beaker to be within 30mL, transferring the solution in the beaker to a 50mL volumetric flask, and carrying out constant volume treatment to 50mL by using deionized water to obtain the sample solution to be detected;
4) detecting the spectral intensity of barium in the sample, and measuring the spectral intensity I of barium in the sample solution to be detected by adopting an inductively coupled plasma emission spectrometerBa；
5) Calculating the mass of barium in the sample solution to be measured according to formula I, C1＝a+b×IBaFormula I, formula I wherein C1Is the mass of barium element, and the unit is ug; a is the background equivalent concentration in ug; b is the conversion of the spectral intensity of barium to mass, and the unit is ug/cps; i isBaThe spectrum intensity of barium in the solution to be measured is cps. The background equivalent concentration a and the conversion b of the spectral intensity of barium to the mass are determined by a working curve equation of the relationship between the mass of barium in the barium standard solution and the spectral intensity of barium, and specifically are as follows: accurately transferring 0, 1.00, 3.00, 5.00, 7.00, 9.00 and 10.00mL of barium standard solution with the mass volume concentration of 5ug/mL into 7 50mL volumetric flasks by using a pipette, and adding the barium standard solution with the volume concentration of 1: 2-1: 5, adding deionized water to constant volume of 50mL, shaking up, and measuring the spectral intensity I of barium at 455.4nm wavelength by using an inductively coupled plasma emission spectrometerBaCalculating the unary linear regression equation m of the working curve of the relation between the mass of barium in the barium standard solution and the spectral intensity of bariumBaDetermining a value a and a value b by a formula II; in the formula II, m is the mass of barium in the determination solution and the unit is ug; a is the background equivalent concentration in ug; b is conversion of barium spectrum intensity to mass, and the unit is ug/cps; i isBaIs the barium spectral intensity in cps;
6) calculating the barium content in the coating of the cold-rolled electroplated tin steel plate according to a formula III, and CBa％＝(C1×10-6) /(A × S) × 100% formula three, in formula three, CBa% is the barium content in unit area in the sample coating; c1The unit is ug which is the mass of the barium element in the solution to be measured; a is the theoretical tin plating amount of the measuring surface of the sample detection part and the unit is g/m2(ii) a S is the sum of the areas of the measuring surfaces of the detecting parts of the samples 1 to 6, and the unit is m2。
2. The method for detecting the content of barium in the coating of the cold-rolled electroplated tin steel plate as claimed in claim 1, wherein in the step 4), the spectral intensity I of barium in the sample solution to be detected is measured by an inductively coupled plasma emission spectrometer at a wavelength of 455.4nmBa。
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