期刊
TALANTA
卷 79, 期 2, 页码 243-248出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2009.03.037
关键词
Gold nanofilm; Electrochemical detection; Arsenite; Neutral solution
资金
- National Natural Science Foundation [20890021]
- National Natural Science Funds for Creative Research Groups [20821063]
- 973 Program [2007CB936404]
We report a simple and novel method of stirring-only-driven accumulation and electrochemical determination of arsenite (As(III)) with both of the oxidation and reduction peaks associated with As(0)/As(III) using a gold nanofilm electrode in neutral solution. Under stirring, a large amount of As(III) was deposited on the modified electrode and the electrochemical response was greatly amplified. The accumulated As(III) on the electrode showed well-defined redox couple in 0.1 M blank phosphate buffer solution (pH 7.0), which could be used for the measurement of As(III). Under optimal conditions, As(III) could be detected in the range from 0.20 to 375 ppb with a detection limit of 0.04 ppb. In particular, with the use of the reduction peak of As(III) the modified electrode exhibits excellent performance for As(III) determination even in the presence of abundant Cu(II). The regeneration of the electrodes is facile with good reproducibility. The electrochemical system was applied to analyze As(III) in lake water, As(III) spiked tap water and drinking water. (C) 2009 Elsevier B.V. All rights reserved.
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