溴化十二烷基二甲基苄基铵─溴麝香草酚蓝分光光度法测定水中阴离子表面活性剂

Spectrophotometric Determination of Anionic Surfactants in water with Dodecyldimethylbenzylammonium Bromide and Bromothymol Blue

本文建立了溴化十二烷基二甲基苄基铵－溴麝香草酚蓝分光光度法水相直接测定阴离子表面活性剂的方法。ＳＤＢＳ在０～１９５μｇ／１０ｍｌ，ＳＤＳ在０～１５８μｇ／１０ｍｌ，ＳＬＳ在０～６０μｇ／１０ｍｌ范围内遵守比耳定律，其表观摩尔吸光系数分别为：３．９９×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）（ＳＤＢＳ）；３．７０×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）（ＳＤＳ）；１．７１×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）（ＳＬＳ）。用此法测定了河水和生活废水中的阴离子表面活性剂，相对标准偏差为０．５７％～１．２％，回收率为９５．５％～１０３％。

A spectrophotometric method had been developed for the deatermination of anionic surfactants in water with dodecyldimethylbenzylammonium buomide (DDBAB ) and bromothymol blue(BTB), The apparent molar absorptivities are 3.99 ×104L·mol-1·cm-1 for sodium dodecylbenzeneslufonate(Ⅰ),3.70× Ⅱ4.mol-1·cm-1 for sodium dodecylsulfate (Ⅱ) and 1.71×104L. mol-1. cm-1 for sedium dodecylsulfonate (Ⅲ),Beer's law was obeyed in the range of 0￣195.0￣158,0￣60μg/10ml for Ⅰ, Ⅱ, Ⅲ, respectively. The anionic surfactant content of environmental wate samples has been determined by using this method. The recoveries of environmental water samples were 95.5%￣ 103% with a relative standard deviation of 0.57%￣1.2%.