Journal
ANALYTICAL CHEMISTRY
Volume 76, Issue 17, Pages 5051-5055Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac049331a
Keywords
-
Categories
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available