邻苯二酚紫分光光度法测定水中阳离子表面活性剂  

Spectrophotometric Determination of Cationic Surfactant CTMAB in the Water with Pyrocatechol Violet

作　　者：翟好英[1] 谢运[1] 阮尚全[1] 王碧[1] 

机构地区：[1]内江师范学院化学与生命科学系,四川内江641112

出　　处：《四川师范大学学报（自然科学版）》2008年第6期754-756,共3页Journal of Sichuan Normal University（Natural Science）

基　　金：四川省教育厅青年基金(2006B101)资助项目

摘　　要：以pH值3.61Walpole缓冲溶液为介质,根据染料邻苯二酚紫与阳离子表面活性剂(cationic surfactant,CS)溴化十六烷基三甲铵(cetyltrimethylammonium bromide,CTMAB)之间由于静电作用而形成离子缔合物,其吸光度降低值△A与CTMAB浓度之间呈线性关系,建立了测定水中痕量阳离子表面活性剂的分光光度新方法.CTMAB的浓度在5.0×10-6-6.0×10-5mol/L范围内与△A是线性关系,其线性回归方程为△A=3058.2c-0.0332,相关系数为0.9998,表观摩尔吸光系数为8.6×104L·mol-1·cm-1.该方法用于测定水样中的CTMAB含量,结果较满意.In pH 3.61 walpole buffer solution, because of the electrostatic force, pyrocateehol violet combines with cationic surfactant CTMAB to form ionic complex, its absorbance abatement △A has a linear relation with the CTMAB concentration. The linear regression equation is △A=3058.2c -0. 033 2, and the relative coefficient is 0. 999 8. A new spectrophotometrie method has been set up to determine the trace cationic suffactant. The results prove that Bill＇ s law is obeyed in the CTMAB concentration range of 5.0 ×10^-6-6.0×10^-5 mol/L and the apparent molar absorptivity is 8.6 × 10^4 L·mol^-1·cm^-1.The method is used for the determination of CTMAB in the water samples. The resuhs are satisfactory.

关 键 词：邻苯二酚紫 分光光度法 阳离子表面活性剂 

分 类 号：O657.32[理学—分析化学]