4.8 Article

Sonically assisted electroanalytical detection of ultratrace arsenic

Journal

ANALYTICAL CHEMISTRY
Volume 76, Issue 17, Pages 5051-5055

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ac049331a

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A simple portable handheld electrochemical sensor with an integrated sound source for the detection of ultratrace quantities of arsenic using square wave anodic stripping voltammetry is described. The sensor uses low-frequency sound (250 Hz) during the arsenic deposition step to enhance the sensitivity of the arsenic stripping response. It is found that under quiescent (silent) conditions a detection limit of 2.1 x 10(-7) M with a sensitivity of 0.51 M-1 A is achievable using a 120-s accumulation period, while applying low-frequency sound using a sonotrode reduced this detection limit to 3.7 x 10(-9) M with an increased sensitivity of 27.2 M-1 A. Thus, the lowfrequency sonotrode is shown to increase the sensitivity by ca. 50 times while reducing the limit of detection by 2 orders of magnitude. A study of the effect of copper contamination is carried out as well as analysis in real samples; it is found that although as expected copper detrimentally effects the arsenic limit of detection, it does not rise significantly above 10(-8) M levels.

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