Spectrophotometric Determination of Trace Amounts of Anionic Surfactants by Air Stripping-Ethyl Violet Method.
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概要
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Determination of trace amounts of anionic surfactant with an enrichment by air stripping method was proposed. Addition of tetra-<I>n</I>-pentyl ammonium bromide as a counter ion was effective for recovery of anionic surfactant. The recovery was about 100%. However, same good recovery was obtained without counter ion in the presence of 3% sodium chloride. The necessary time to take 20ml of froth solution from 1.1l sample solution was within 2 min. The surfactant solution resulted was determined by Ethyl Violet method. In the case of sea water sample, washing of the toluene phase with sodium sulfate-Ethyl Violet solution was required. Anionic surfactnt in real samples near 1 × 10<SUP>-8</SUP> mol/l can be determined by the proposed method.
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