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Heavy Metals Measurement: A Suitable Solution to Improve Online Measurement Celerity

Dias Pereira, J. M. ; Postolache, O. ; Girão, P.M.

Instrumentation Science and Technology Vol. 40, Nº 4, pp. 355 - 371, June, 2012.

ISSN (print): 1073-9149
ISSN (online): 1525-6030

Journal Impact Factor: (in )

Digital Object Identifier: 10.1080/10739149.2012.673201

Abstract - This paper presents a low cost voltammetry-based measuring system to identify heavy metals dissolved in water and to evaluate their concentrations. The main objective of the proposed measurement system is related with measurements’ celerity. A segmented voltage sweep mode is proposed to overcome the slowness that is inherent to the use of the traditional continuous voltage sweep mode used in anodic striping voltammetry. The segmented voltage sweep is performed around the voltammetric current peaks that are associated with the heavy metals with higher concentrations or around voltage ranges that are associated with specific metals’ redox potentials. A solution to improve measurement celerity by reducing the time needed to remove the dissolved oxygen contained in the water sample is also presented. The paper also includes the presentation of two self-test modes and several experimental results to evaluate the performance of the proposed measurement method.

Keywords - heavy metals measurement, electrochemical analysis, voltammetry, self-test, measurement celerity.