TITLE

Stripping coulometric determination of cadmium, lead and copper at modified screen-printed electrodes

AUTHOR(S)
Navolotskaya, D. V.; Ermakov, S. S.; Egorova, E. A.; Nikolaev, K. G.
PUB. DATE
June 2013
SOURCE
Vestnik Sankt-Peterburgskogo universiteta, Seriia 7: Geologia, G;2013, Issue 2, p136
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A rapid and cheap technique of simultaneous stripping coulometric (SC) determination of cadmium, lead and copper at preliminary mercury-modified screen-printed electrodes is proposed. Optimal conditions of stripping coulometric measurements are selected, i. e. composition of supporting electrolyte, range of working potentials, electrolysis time. The values of coulometric constants (k) for Cd2+, Pb2+ and Cu2+ ions for the solution volume of 100 μl were determined. The reproducibil-ity of the obtained constants for different cell samples from the same batch was checked. It was shown that the values of k are characterized by a reasonably good reproducibility. The method was tested using a standard addition method and by the analysis of real samples. In particular, samples of natural water, rice and mushrooms were analysed. The results of SC determination are in good agreement with those of the reference methods. Limits of detection calculated are 1 ⋅ 10-8M, 1.5 ⋅ 10-9M and 8 ⋅ 10-9M for Cd2+, Pb2+ and Cu2+, respectively. The technique suggested reduces the cost of analysis by saving reagents (primarily due to the lack of need in standard solutions) and the analysis time by almost 2-2.5 times compared to earlier versions of SC.
ACCESSION #
94325279

 

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