Method for determining ion content of cationic polyacrylamide by utilizing spectrophotometry
A polyacrylamide and spectrophotometry technology, applied in the direction of chemical reaction of materials, material analysis by observing the influence of chemical indicators, etc., can solve the problem of slow color change of solution, insensitive end point discrimination, experimental Accuracy dependence and other problems, to avoid solution color reversion, improve the success rate of measurement, and achieve the effect of high accuracy
Active Publication Date: 2011-11-16
BEIJING DRAINAGE GRP CO LTD
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[0005] To sum up, near the end point of titration, the color of the solution changes slowly. Judging only by naked eyes, there is an insensitive end point discrimination. The relative error is about 5% to 10%. The accuracy of the experiment depends on the tester.
In addition, the solution is easy to return color, resulting in measurement failure
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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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The invention discloses a method for determining the ion content of cationic polyacrylamide by utilizing spectrophotometry, which is characterized in that polyvinyl alcohol lemery is prepared into a standard solution, a colloidal titration method of titrating a cationic polyacrylamide dilute solution is adopted, and visible light spectrophotometry is adopted to judge the end point of the titration. The method comprises the concrete steps: 1. preparing the standard solution; 2. preparing the cationic polyacrylamide solution and diluting; 3. regulating the pH value to 1-3 with 1 percent of hydrochloric acid, and adding 100 microlitres of 0.5 percent of toluidine blue indicator; 4. titrating with the standard solution; 5. drawing a photometric titration curve S; 6. and doing a group of blankexperiments by referencing the steps of 1-5. The invention uses the photometric titration to determine the ion content of cationic polyacrylamide and observes the color change of the solution insteadof naked eyes, thereby reducing end point judgment errors and avoiding the determining failure caused by color reversion, and therefore, the goals of increasing the end point judgment precision and the determining result accuracy are achieved.
Description
Technical field: [0001] The invention belongs to the technical field of polyacrylamide detection, in particular to a method for measuring the ion degree of cationic polyacrylamide. Background technique: [0002] Polyacrylamide (PAM) and its derivatives have a large number of amide groups and other charged groups on the molecular chain, which has good water solubility, excellent flocculation performance and adsorption performance, and is used as a flocculant, assistant in the water treatment industry Coagulants have been widely used in the treatment of drinking water, industrial wastewater and sludge disposal. [0003] Cationic degree is an important parameter of cationic PAM, and its size directly affects the flocculation performance of cationic polymer. Therefore, in the research of cationic polymers, an effective method for determining the degree of cationicity is very important. There are many methods for measuring PAM ionicity, mainly including: C-NMR method, infrared ...
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IPC IPC(8): G01N21/79
Inventor 柏永生陈沉周军念东甘一萍
Owner BEIJING DRAINAGE GRP CO LTD