流动注射催化光度法测定阳离子表面活性剂

Study on determination of cationic surfactants by flow injection analysis coupling with catalytic spectrophotometry

在磷酸溶液中,阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)能显著催化溴酸钾氧化偶氮胂Ⅲ褪色。基于此,结合流动注射技术,建立了催化动力学光度法快速、简便测定水环境中痕量阳离子表面活性剂新方法。在优化的实验条件下,线性范围为8~5000μg·L^(-1)(相关系数r≥0.9996,n=13),检出限(3σ)为6.0μg·L^(-1),回收率为96.4~102.1%,相对标准偏差(RSD)为1.76%(500μg·L^(-1)的CTMAB添加于河水水样,n=14)。该法具有较高的灵敏度和准确度,用于环境水样、生活污水及皮革废水中痕量阳离子表面活性剂的检测,结果令人满意。

A new flow injection analysis coupling with catalytic dynamics spectrophotometry for simple and rapid determination method of trace cationic surfactants(CSs)in water environment is proposed,which is based on the markedly catalytic action of cationic surfactants,such as cetyltrimethylammonium bromide(CTMAB),on oxidation discoloration of Arsenazo(Ⅲ)using KBrO 3 in the high acidic phosphoric acid solution.Under the optimum conditions,The linear range for CTMAB is 8~5000μg·L-1 and every relative coefficient of CTMAB in different parts of the linear ranges is 0.9996 or more(n=13).The detection limits(3σ)of CTMAB is 6.0μg·L-1,and the recovery percentages range from 96.4%to 102.1%.The relative standard deviation(RSD)is 1.76%for 500μg·L-1 CTMAB added in river water(n=14).The proposed method has high sensitivity and veracity,and was applied successfully to the determination of CSs at ug·L-1 levels in surrounding water,living waste water and leather waste water samples with satisfactory results.