【摘要】 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。更多还原

【Abstract】 Thecolor reaction of anionksurfactants（AS）withdodecyldimethylbenzylammoniumbromide（DDBAB）and bromothymol blue（BTB）has been studied. In a NaH₂PO₄-Na₂HPO₄ buffer solution at pH 7.4～8.2,anionic surfactants react with DDBAB andBTB to form an ion-associate complex,andits mo1ar rath（AS:DDBAB:BTB）is 1:2:1.The maximum absorption exhbits at614nm and the apparent molar absorptivitiesare 3. 99 ×1 0￣4L. mol￣（-1）. cm￣（-1） for sodium do-decylbenzenesulfonate（Ⅰ）,3. 70 × 10￣4L.mol￣（-1）. cm￣（-1） for sodium dodecylsulfate（Ⅱ）and 1. 71 × 10￣4L. mol￣（-1）. cm￣（-1）for sodium do-decylsulfonate（Ⅲ）.Beer’s law is obeyed in the range of 0～195,0～158,0～60μg/10mLfor Ⅰ,Ⅱ,Ⅲ,respectively. The proposedmethod has been applied to the determina-tion of anionic surfactants in river water andwaste water with satkfactory results.更多还原