Method for rapidly determining content of mercaptoacetic acid
A technology for rapid determination of thioglycolic acid, which is applied in chemical analysis by titration, measuring device, and material analysis by observing the influence of chemical indicators. The effect of low adaptability and equipment requirements
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[0029] A rapid assay method for thioglycolic acid content, said method comprising the steps of: adding 0.0221g of thioglycolic acid into 50mL of 1mol / L sodium hydroxide solution, stirring at about 1000rpm for 60s, then adding 8.5mL of precoloured solution, and then stirring at 1000rpm Stir and react for 20 minutes, after the completion of the stirring, use iodine standard titration solution for titration, stay for 20 s after every 1 drop, measure the solution potential with a composite electrode, stop titration after the obtained potential is greater than 20% of the theoretical value, and draw the potential change curve, Such as figure 1 As shown, the titration end point was determined to be 14.302 mL, and the content of thioglycolic acid was 99.337% when substituted into the stoichiometric equation.
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