流动注射分光光度法测定环境水中阴离子表面活性剂  

FI-Spectrophotometric Determination of an Anionic Surfactant in Environmental Water

作　　者：魏良[1] 张新申[2] 代以春 谢永红[2] 黄进[2] 肖凯[2] 

机构地区：[1]西南科技大学环境与资源学院,绵阳621010 [2]四川大学皮革与工程教育部重点实验室,成都610065 [3]四川省科学城神工环保有限公司,绵阳621900

出　　处：《理化检验（化学分册）》2009年第9期1077-1079,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家"十一.五"863项目(2006AA09Z173)资助

摘　　要：在pH 2.4的邻苯二甲酸氢钾-盐酸缓冲溶液中,在聚乙烯醇存在下,乙基紫与阴离子表面活性剂十二烷基苯磺酸钠(SDBS)形成疏水性离子缔合物,其吸收峰位于550 nm波长处。在此基础上提出了将分光光度法和流动注射技术联用,可在线测定环境水样中痕量阴离子表面活性剂。方法的线性范围和检出限(3S/N)分别为0.08～3.5 mg·L^(-1)和4.39μg·L^(-1),对质量浓度为2.4 mg·L^(-1)十二烷基苯磺酸钠进行了14次平行测定,其相对标准偏差为1.72%。该方法已应用于环境水中SDBS的测定,测定结果与标准方法测定值一致。标准加入法测得的回收率在95.0%～107.4%之间。In a phthalate buffer of pH 2. 4 and in the presence of polyvinyl alcohol, a hydrophobic ionic association compound was formed between ethyl violet and sodium dodecyl benzene sulfate （SDBS）, showing its absorption maximum at the wavelength of 550 nm. Based on this fact, a new on-line method for determination of an anionic surfactant, SDBS, by FI-spectrophotometry was proposed. Range of linearity for SDBS concentration was found between 0. 08--3.50 mg·L^-1. Detection limit （3S/N） found was 4. 39 μg·L^-1. Precision was tested with standard solution containing 2. 4 mg·L^-1 SDBS for 14 determinations, giving value of RSD of 1. 72%. Four samples of environmental water were analyzed by the proposed method for their contents of SDBS, giving results in consistency with the results found by the GB standard method. Values of recovery found by standard addition method were in the range of 95.0%-107. 4%.

关 键 词：流动注射分光光度法 阴离子表面活性剂 乙基紫 十二烷基苯磺酸钠 

分 类 号：O657.31[理学—分析化学]