Method for determining ion content of cationic polyacrylamide by utilizing spectrophotometry
A technology of polyacrylamide and spectrophotometry, which is applied in the direction of analyzing the material by chemical reaction and analyzing the material by observing the influence of the chemical indicator. Accuracy dependence and other issues to achieve the effect of avoiding the color return of the solution, improving the success rate of measurement, and high accuracy
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[0023] Using spectrophotometry to measure the ionicity of cationic polyacrylamide, weigh about 0.1075g of potassium polyvinyl alcohol sulfate, dissolve it in a 1000mL volumetric flask with deionized water, and the concentration of the standard solution is 6.636×10 -4 mol / L. Use weighing paper to weigh 0.5063g of cationic polyacrylamide sample after drying to constant weight, and dissolve it in a 1000mL volumetric flask with deionized water; take 2ml of cationic polyacrylamide solution into a 100mL beaker with a pipette, and add 70mL of deionized water. Adjust the pH to 1.6 with 1% hydrochloric acid solution. Add 100 μL of 0.5% toluidine blue indicator. Titrate with a standard solution, the titration rate is controlled at 1.5mL / min, and the change in absorbance is recorded with a 610nm photometer. After exceeding the equivalence point, continue titration until the absorbance is stable. Then take the absorbance A as the ordinate, the consumption volume V of the standard solut...
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