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An accurate direct titration method for the determination of anion and cation‐active compounds has been developed using new partition end points based on the solubility in organic solvents of complexes formed between anion‐active agents and methylene blue, and between cation‐active agents and bromophenol blue respectively. The new method has been compared with known methods.
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Barr et al. (1948) studied this question.
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