Abstract

We show a possibility of the spectrophotometric determination of 2,4-dichlorophenoxyacetic acid based on the extraction of its ion pair (IP) with polymethine dye Astrafloxin FF with toluene. The maximum recovery of the ion pair from the aqueous phase is achieved at pH 6–11 and a dye concentration of (1.6–2.8) × 10^–4 M. The conditional molar absorption coefficient of the ion pair is 4.0 × 10⁴, and the limit of detection for 2,4-dichlorophenoxyacetic acid is 0.9 µg/mL. The developed method of the extraction–spectrophotometric determination of 2,4-dichlorophenoxyacetic acid was used to analyze water and herbicides.

中文翻译：

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黄曲霉毒素萃取分光光度法测定2,4-二氯苯氧基乙酸

摘要

我们展示了用聚次甲基染料Astrafloxin FF和甲苯萃取其离子对（IP）的方法，可以分光光度法测定2,4-二氯苯氧基乙酸。在pH值为6-11且染料浓度为（1.6-2.8）×10 ^-4 M时，可以从水相中最大程度地回收离子对。离子对的条件摩尔吸收系数为4.0×10 ⁴，并且2,4-二氯苯氧基乙酸的检出限为0.9 µg / mL。发达的萃取-分光光度法测定2,4-二氯苯氧基乙酸的方法用于分析水和除草剂。