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本文研究了溴化十二烷基二甲基苄基铵－溴百里酚蓝与阴离子表面活性剂显色反应的适宜条件。结果表明，在ｐＨ７．４～８．２范围内阴离子表面活性剂与题示试剂形成１：２：１的绿色离子缔合物，其最大吸收峰位于６１４ｎｍ处。表现摩尔吸光系数分别为：＝３．９９×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）；＝３．７０×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）；＝１．７１×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。ＳＤＢＳ在０～１９５μｇ／１０ｍＬ，ＳＤＳ在０～１５８μｇ／１０ｍＬ，ＳＬＳ在０～６０μｇ／１０ｍＬ范围内遵守比耳定律。该法用于河水和生活废水中阴离子表面活性剂测定，结果满意。
In this paper, suitable conditions for the color reaction of dodecyldimethylbenzyl ammonium bromide-bromothymol blue with anionic surfactant were studied. The results showed that the anionic surfactant formed a 1: 2: 1 green ion association with the title reagent at a pH range of 7.4-8.2, and the maximum absorption peak was at 614 nm. The molar absorptivities were as follows: 3.99 × 10-4L · mol -1 · cm -1; 3.70 × 10 -4L · mol -1 -1 · cm -1, 1); = 1.71 × 10 ~ 4L · mol ~ (-1) · cm ~ (-1). Beer’s law is obeyed at 0 ~ 195μg / 10mL for SDBS, 0 ~ 158μg / 10mL for SDS and 0 ~ 60μg / 10mL for SLS. The method is applied to the determination of anionic surfactant in river water and domestic wastewater with satisfactory results.