洗剤中のアニオン界面活性剤の自動定量

概要

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An Automated method was developed for the determination of anionic surfactants in detergents with Technicon Auto Analyzer II on the basis of the Methylene Blue spectrophotometric method. Sample solutions were introduced into the continuous flow of the mixture of chloroform and the Methylene Blue solution. Both phases were mixed well in the Teflon mixing coil and the complex formed was extracted into chloroform. The chloroform phase was separated continuously and its absorbance was measured at 650 nm. The relative extractability of the complex of various anionic surfactants and Methylene Blue was improved by the addition of methanol and using the Teflon mixing coil. Anionic surfactants were determined in the range of 1×10<SUP>-3</SUP>4×10<SUP>-3</SUP> M. Twenty samples could be determined within 1h.
社団法人日本油化学会の論文