硫代乙酰胺共振光散射法检测环境水样中痕量汞  

Determination of Trace Mercury with Thioacetamide in Environmental Water Samples by Resonance Light Scatting

作　　者：王莹莹[1] 李华春[1] 谭克俊[1] 

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

出　　处：《应用化学》2012年第2期233-237,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20877063);重庆市科学技术委员会基金(CSTC,2007BB7360)资助项目

摘　　要：在pH=3.29的酸性介质中,硫代乙酰胺(TAA)与二价汞离子发生作用产生以379.0 nm为特征峰的共振光散射(RLS)增强光谱。在此波长下,二价汞离子的浓度与增强共振光散射强度(ΔIRLS)呈线性关系。研究了酸度、离子强度、温度、时间以及共存物质的影响,确定了最佳测定条件,据此建立了检测痕量汞的共振光散射分析法,线性范围为0.2～10.0μmol/L,对汞的检测限为0.02μmol/L。方法成功的应用于环境水样中汞离子的检测。In pH = 3：29 acidic medium, the interaction of Hg （ II ） with thioacetamide （TAA） occurs and results in greatly enhanced resonance light scattering（RLS） signals characterized by a peak at 379. 0 nm. The results show that the enhanced RLS signals intensity （△IRIS） at 379. 0 nm is proportional to the concentration of TAA. A RLS method for the determination of trace mercury ions is then established accordingly. The linear range is 0. 2 - 10. 0 μmol/L. The limit of detection is 0. 02 μmol/L for Hg（II）. Effects of the acidity, ionic strength, temperature and coexisting substances interference are also investigated. The method has been applied successfully to the determination of Hg^2＋ in environmental samoles.

关 键 词：共振光散射 Hg(Ⅱ) 硫代乙酰胺 

分 类 号：O657.3[理学—分析化学]