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Interference of Pb leaching from the pH electrode on Cd-metallothionein complex

Erk, Marijana; Raspor, Biserka (2001) Interference of Pb leaching from the pH electrode on Cd-metallothionein complex. Analytica Chimica Acta, 442 (1). pp. 165-170. ISSN 0003-2670

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The electrochemical behaviour of CdMT complexes from commercially available rabbit liver (MTRL) and isolated from the mussel (Mytilus galloprovincialis) digestive gland (MTDG) was studied by pH-titration, using a differential pulse anodic stripping voltammetry (DPASV). When the conventional combined pH-electrode is directly immersed in the supporting electrolyte uncontrolled leaching of lead from the glass of the pH-electrode occurs. The lead contamination of the studied system is considerable, since the study is performed at the trace level of the order of 10-8 mol dm-3 of both metal and ligand. During the pH-titration the dissociation of the CdMT complex is not caused only with pH but also with the uncontrolled leaching of Pb2+ ions which disables the determination of the dissociation stability constant of CdMT complex.

Item Type: Article
Uncontrolled Keywords: Cd-metallothionein; pH-titration; Pb-competition; differential pulse anodic stripping voltammetry
Subjects: NATURAL SCIENCES > Chemistry
NATURAL SCIENCES > Interdisciplinary Natural Sciences
Divisions: Division for Marine and Enviromental Research
Depositing User: Marijana Erk
Date Deposited: 10 Jul 2015 12:16
DOI: 10.1016/S0003-2670(01)01130-8

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