期刊论文

中文

光谱实验室

1004-8138

2007

24

5

902-906

10.3969/j.issn.1004-8138.2007.05.035

本校为第一机构

建立了一种测定环境水中痕量砷(Ⅲ)的共振瑞利散射(RRS)新方法.在pH=6.6 KH_2PO_(4-)Na_2HPO_4(PBS)缓冲溶液中和聚乙烯醇(PVA)存在时,I~-_3与结晶紫(CV)能生成稳定的离子缔合物,导致共振瑞利散射增强.当加入微量As(Ⅲ)时,碘能定量氧化As(Ⅲ),导致共振瑞利散射减弱.在0.1-3.0 μg/25mL浓度范围内,体系的共振瑞利散射改变值△I_(RRS)与As(Ⅲ)浓度呈线性关系,方法检出限为1.0μg/L.已用于环境水样中痕量As(Ⅲ)的测定,结果令人满意.

A resonance Rayleigh scattering method is proposed for the determination of arsenic （ Ⅲ ）based on the reactions that I2 reacts with excessive I^- to form I3^- ,and further reacts with crystal violet to form an ion-association complex in the presence of PVA in the buffer of KH2PO4-Na2HPO4. The decrease of resonance Rayleigh scattering intensity is linear to the concentration of arsenic（ Ⅲ） in the range of 0. 1-3.0μg/25mL with the detection limit of 1.0μg/L. The method was applied to the determination of...