Additional evidence of the operational character of the lability of complexes of copper(II) with simple organic ligands

• Type: Article in International Scientific Journal
• Date: 1996

Authors

Vasconcelos, MTSD (Author) Other; Azenha, MAO (Author) Other

Journal

Title: Analytica Chimica Acta

Vol. 333

Pages: 97-105

ISSN: 0003-2670

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 9 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-001-DGX

DOI: 10.1016/0003-2670(96)00281-4

Abstract (EN): A fixed analytical window of observation, 5 mu mol l(-1) free copper and 100 mu mol l(-1) total copper, but methods different in nature, operation mode and time scale were applied, in parallel, at pH 6.50 and 16 degrees C, to solutions with copper complexes of very different thermodynamic stabilities. Ethylenediaminetetraacetic acid (EDTA), L-cysteine, L-lysine, L-proline and succinate were used as metal buffers. Chitin (batch and column modes), chelex-100 (column mode) and normal pulse anodic stripping voltammetry (NPASV, -0.3 V deposition potential) were used as techniques. A strategy, based on using the mass of polymer that provided uptake of free copper similar to that taken up by Pseudomonas syringae bacterial cells in absence of ligands, was used for all but NPASV methods. Flame atomic absorption spectrophotometry was used for metal detection. The lability of copper complexes with simple organic ligands showed a strongly operational character. The time scale of the physicochemical method used for the determination of lability was not the only parameter inherent to the method that influenced the extent of copper complex dissociation. The nature of both initial and competing ligands and the operation mode may also condition the speciation results.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9