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Transactions of the Institute of Measurement and Control
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Acidity compensation of electrochemical measurements for on-site monitoring of heavy metals

Konstantinos Christidis

Peter K. J. Robertson

Ken S. Gow

Pat M. Pollard

Centre for Research in Energy and the Environment, School of Engineering, The Robert Gordon University, Schoolhill, Aberdeen AB101FR, UK

This paper presents an electrochemical instrumentation system capable of real-time in situ detection of heavy metals. A practical approach to introduce acidity compensation against changes in amplitude of the peak currents is also presented. The compensated amplitudes can then be used to predict the concentration level of heavy metals. The system uses differential pulse anodic stripping voltammetry, which is a precise and sensitive analytical method with excellent limits of detection. The instrument is capable of detecting lead, cadmium, zinc, nickel and copper with good sensitivity and precision. The system avoids expensive and time-consuming procedures and may be used in a variety of situations to help environmental assessment and control.

Key Words: acidity effect • electrochemical detection • heavy metals • instrumentation • voltammetry

Transactions of the Institute of Measurement and Control, Vol. 28, No. 4, 323-333 (2006)
DOI: 10.1177/0142331206070359
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