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硫代乙酰胺共振光散射方法检测环境水样中痕量汞

王莹莹,李华春,谭克俊*   

  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)
  • 收稿日期:2011-03-10 修回日期:2011-05-03 出版日期:2012-02-10 发布日期:2012-02-10
  • 通讯作者: 谭克俊，副教授; Tel/Fax:023-68367257; E-mail:tankj@swu.edu.cn; 研究方向：环境分析化学
  • 基金资助:
    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

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

WANG Yingying, LI Huachun, TAN Kejun*   

  1. (Key Laboratory of Eco-Environments of Three Gorges Reservoir Region under Ministry
    of Education of PRC,College of Chemistry and Chemical Engineering,Southwest University,Chongqing 400715)
  • Received:2011-03-10 Revised:2011-05-03 Published:2012-02-10 Online:2012-02-10

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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0.2~10.0 μmol/L,对汞的检测限为0.02 μmol/L。 方法成功的应用于环境水样中汞离子的检测。

关键词: 共振光散射, Hg(Ⅱ), 硫代乙酰胺

Abstract: 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(ΔIRLS) 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 Hg2+ in environmental samples.

Key words: resonance light scattering, mercury, thioacetamide (TAA)

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