食用タール色素中の塩素イオンと硫酸イオンの定量

概要

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The official method for the determination of Cl^- and SO^<2->_4 in food coal-tar dyes gave low results because of the adsorption of significant amounts of the ions on activated charcoal. Automatic potentiometric titration method, which the titration stopped automatically at a setting potential, was applied to the determination of Cl^- in the dyes. The condition of electrode potential having a constant value at the end point was examined, and Cl^- was automatically determined rapidly and simply with less than 1% error. SO^<2->_4 in azo and triphenylmethane dyes was separated from the dyes by extraction with Amberlite LA-2 and determined with less than 2% error by chelate titration method with EDTA after adding excess barium nitrate. SO^<2->_4 in Acid Red was directly determined with less than 2% error by chelate titration method using potentiometric end point detection, because it was found that the dye containing sulfonic acid groups in the molecule was not precipitated by Ba^<2+>.
公益社団法人日本薬学会の論文
1969-12-31