Determination of trace arsenic on hanging copper amalgam drop electrode

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• 作者：Robert Piech ; Bogusł ; aw Ba&#x15b ; Ewa Niewiara ; Wł ; adysł ; aw W. Kubiak
• 关键词：Trace analysis ; Arsenic determination ; Hanging copper amalgam drop electrode ; Differential pulse cathodic stripping voltammetry
• 刊名：Talanta
• 出版年：2007
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：30 April 2007
• 卷：72
• 期：2
• 页码：762-767
• 文件大小：186 K

摘要

Hanging copper amalgam drop electrode has been applied for trace determination of arsenic by cathodic stripping analysis. Detection limit for As(III) as low as 0.33 nM (0.02 μg/L) at deposition time (240 s) could be obtained. For seven successive determinations of As(III) at concentration of 5 nM relative standard deviation was 2.5%(n = 7). Interferences from selected metals and surfactant substances were examined. Absence of copper ions in sample solution causes easier optimization and makes method less vulnerable on contamination. The developed method was validated by analysis of certified reference materials (CRMs) and applied to arsenic determinations in natural water samples.