1. A novel field deployable filter paper based amperometric gas sensor for the measurement of arsenic in water.
- Author
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Hussam, Abul and Hong, Jinsoo
- Subjects
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FILTER paper , *AMPEROMETRIC sensors , *GAS detectors , *ARSENIC content of drinking water , *OXIDATION - Abstract
The presence of toxic levels of inorganic arsenic in drinking water is a worldwide problem. Measurement of millions of samples in the field for arsenic is an analytical challenge and the first step to solve the problem. Here, we developed a novel electrochemical arsine sensor and system based on the cell: C(s)/I 3 − I 2 , AsH 3 (g/aq)//I 3 − , I 2 AgI(s)/Ag(s), where I 3 − /I 2 mediated AsH 3 (g/l) oxidation which occurred on the C(s) electrode. The sensor system requires 50 μL of 10 mM iodine solution and a small piece of filter paper placed inside a novel electrochemical cell. The cell exhibited highly efficient arsine mass transport with a limit of detection of 15 μg/L As(III) in water. A mathematical model of mass transfer of AsH 3 (g/aq) and following electrochemical reaction was developed and applied to explain the experimental data. Groundwater samples containing arsenic were measured to prove its utility in a field deployable instrument. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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