1,10-菲啰啉-全氟辛烷磺酸(PFOS)体系共振光散射法测定痕量镉(Ⅱ)  

Determination of trace cadmium by resonance light scattering technique with 1,10-phenanthroline-perfluorooctane sulfonate system

作　　者：袁睿[1] 谭克俊[1] 

机构地区：[1]三峡库区生态环境教育部重点实验室,西南大学化学化工学院,重庆400715

出　　处：《环境化学》2012年第6期885-889,共5页Environmental Chemistry

基　　金：国家自然科学基金项目(20877063)资助

摘　　要：在pH 6.8 Britton-Robinson(BR)缓冲介质中,镉(Ⅱ)与1,10-菲啰啉(Phen)作用后与全氟辛烷磺酸(PFOS)形成离子缔合物,使体系的共振光散射信号显著增强.最大散射峰位于307.0 nm处,其增强散射信号强度与镉(Ⅱ)的浓度在6.0—342.5 ng·mL-1范围内呈线性关系,据此建立了测定镉(Ⅱ)含量的共振光散射分析方法,检出限(3!)为0.6 ng·mL-1,研究了反应产物的RLS光谱特征,适宜的反应条件和影响因素,考察了共存物质的影响.该方法用于自来水和实验室废水样中镉(Ⅱ)的测定,RSD≤4.4%.In pH 6.8 Britton-Robinson （BR） buffer, a resonance light scattenng （RLS） anatyucal ,for Cd（ Ⅱ） was established. The method is based on the enhanced RLS signal due to the interaction of PFOS with the complex formed between Cd （ Ⅱ） and 1,10-phenanthorline （Phen）. The enhanced RLS intensity at 307.0 nm is proportional to the content of Cd （Ⅱ） in a range of 6.0--342.5 ng.mL- 1. The limit of detection （3σ） is 0. 6 ng＇mL-1 The optimum reaction conditions and the interference of foreign substances were investigated. This method was successfully applied to the determination of Cd（ Ⅱ） in tap water and laboratory waste water samples with RSD ≤4.4%.

关 键 词：共振光散射 镉 邻菲啰啉 全氟辛烷磺酸 

分 类 号：X832[环境科学与工程—环境工程] O657.3[理学—分析化学]