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Determination of phytochelatins by cathodic stripping voltammetry in the presence of copper(II)

✍ Scribed by Gioacchino Scarano; Elisabetta Morelli

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
513 KB
Volume
319
Category
Article
ISSN
0003-2670

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✦ Synopsis

The voltammetric behaviour of the copper-phytochelatin (PC) complex in 0.5 M NaCl at pH 8.1 at the hanging mercury drop electrode was investigated. An analytical method that utilizes the current produced, in the presence of Cu(II), by a copper complex with the cysteine groups of the adsorbed PCs, was developed. At a C&I) concentration of 2.5 X 1O-6 M, sensitive measurements can be achieved by using differential pulse cathodic stripping voltammetry. The effects of the experimental parameters such as preconcentration time, adsorption potential and copper concentration on the peak current are discussed. The stripping current was found to be proportional to the total concentration of thiol groups of phytochelatins (SH,,).

The sensitivity was 8 X 10e3 nA s-l nM-'. Using an accumulation time of 300 s at -0.4 V, an SH,, concentration of 1 nM can be detected.

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