氯金酸共振光散射探针测定阳离子表面活性剂  

Determination of Cationic Surfactants with Chloroauric Acid for Resonance Light Scattering

作　　者：王雪[1] 吴立航[1] 陈艳华[1] 梁芳慧[2] 邓新煜[1] 刘贺[1] 张寒琦[1] 田媛[1] 

机构地区：[1]吉林大学化学学院,长春130021 [2]长春医学高等专科学校,长春130013

出　　处：《分析化学》2011年第12期1882-1886,共5页Chinese Journal of Analytical Chemistry

摘　　要：在HCl-NaAc缓冲溶液(pH 2.0)中,十六烷基三甲基溴化铵(CTMAB),十六烷基三甲基氯化铵(CTMAC)和溴化十六烷基吡啶(CPB)3种阳离子表面活性剂,与氯金酸(HAuCl4)的酸根离子由于静电引力能形成稳定的离子缔合物,引起共振光散射信号的增强。在400 nm左右,CTMAB,CTMAC和CPB分别在8.00×10-7～1.50×10-5 mol/L,1.00×10-7～1.50×10-5 mol/L和2.50×10-7～1.00×10-5 mol/L浓度范围内与共振光散射强度(ΔI)呈良好的线性关系。实验研究了影响共振光散射测定阳离子表面活性剂的各种因素,表明本方法具有较好的选择性,是一种快速、环保的检测污水中表面活性剂的方法。The chloroauric acid anion was applied as resonance light scattering（RLS） probe for the determination of three kinds of cationic surfactants,cetyltrimethyl ammonium bromide（CTMAB）,cetyl trimethyl ammonium chloride（CTMAC）,cetylpyridinium bromide（CPB） separately in HCl-NaAc（pH=2.0） buffer solution.The reaction between chloroauric acid anion and cationic surfactants was because of their electrostatic attraction,which can form a stable ion-association complex,thus the RLS intensity of system increased.The characteristic peak was located at 400 nm.Another two peaks were also observed at 227 nm and 590 nm.The optimization conditions of the reaction were examined at 400 nm.Under the selected conditions,the enhanced RLS intensity showed a good linear relationship with the cationic surfactants concentrations in the range of 8.00×10-7-1.50×10-5 mol/L for CTMAB,1.00×10-7-1.50×10-5 mol/L for CTMAC and 2.50×10-7-1.00×10-5 mol/L for CPB,respectively,the detection limits for CTMAB,CTMAC and CPB were 4.01×10-8,4.06×10-8 and 4.72×10-8 mol/L,respectively.The effect of some coexistent substances was aexamined.Some real samples were analyzed by the RLS method.The results of this method were consistent with those of spectrophotometric method.

关 键 词：氯金酸 阳离子表面活性剂 共振光散射 

分 类 号：TQ423.12[化学工程] O657.3[理学—分析化学]