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Sensors 2008, 8(9), 5619-5636; doi:10.3390/s8095619
Article

Amperometric Sensor for Detection of Chloride Ions

1, 2,3, 4, 5 and 1,*
Received: 31 July 2008 / Revised: 9 September 2008 / Accepted: 11 September 2008 / Published: 15 September 2008
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Abstract

Chloride ion sensing is important in many fields such as clinical diagnosis, environmental monitoring and industrial applications. We have measured chloride ions at a carbon paste electrode (CPE) and at a CPE modified with solid AgNO3, a solution of AgNO3 and/or solid silver particles. Detection limits (3 S/N) for chloride ions were 100 μM, 100 μM and 10 μM for solid AgNO3, solution of AgNO3 and/or solid silver particles, respectively. The CPE modified with silver particles is the most sensitive to the presence chloride ions. After that we approached to the miniaturization of the whole electrochemical instrument. Measurements were carried out on miniaturized instrument consisting of a potentiostat with dimensions 35 × 166 × 125 mm, screen printed electrodes, a peristaltic pump and a PC with control software. Under the most suitable experimental conditions (Britton-Robinson buffer, pH 1.8 and working electrode potential 550 mV) we estimated the limit of detection (3 S/N) as 500 nM.
Keywords: Chloride Ions; Silver; Carbon Paste Electrode; Screen Printed Electrode; Voltammetry; Amperometry Chloride Ions; Silver; Carbon Paste Electrode; Screen Printed Electrode; Voltammetry; Amperometry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Trnkova, L.; Adam, V.; Hubalek, J.; Babula, P.; Kizek, R. Amperometric Sensor for Detection of Chloride Ions. Sensors 2008, 8, 5619-5636.

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