Sonically assisted electroanalytical detection of ultratrace arsenic

Analytical Chemistry
Andrew O SimmRichard G Compton

Abstract

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 low-frequency 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.

Citations

Dec 18, 2004·Analytical and Bioanalytical Chemistry·Andrew O SimmRichard G Compton
Jun 24, 2014·Journal of Hazardous Materials·Zhong-Gang LiuXing-Jiu Huang
Jun 9, 2006·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Xuan Dai, Richard G Compton
May 6, 2015·Analytical Chemistry·Nafiseh MoghimiKam Tong Leung
Feb 19, 2014·The Analyst·Sthitaprajna Dash, N Munichandraiah
Nov 29, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Xiang MaJingyang Niu
Mar 15, 2005·Analytical Chemistry·Craig E BanksRichard G Compton

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