Citation: Ai Ru LU, Leslie D. PETTIT, Gareth BERNARD, Jan E. GREGOR. A COMPARISON OF THE DETERMINATION OF STABILITY CONSTANTS OF COMPLEXES OF Cd(Ⅱ) WITH AMINO ACIDS AND SIMPLE PEPTIDES USING MICRO-pH-METRIC TITRATIONS AND CYCLIC VOLTAMMETRY[J]. Chinese Chemical Letters, ;1993, 4(10): 933-934. shu

A COMPARISON OF THE DETERMINATION OF STABILITY CONSTANTS OF COMPLEXES OF Cd(Ⅱ) WITH AMINO ACIDS AND SIMPLE PEPTIDES USING MICRO-pH-METRIC TITRATIONS AND CYCLIC VOLTAMMETRY

a Department of Chemistry, Northwest University, Lanzhou 730070;
b School of Chemistry, The University of Leeds, Leeds, LS2,9 JT, U, K

Received Date: 10 March 1993

This paper reports the determination of stability constants for complexes of Cd (Ⅱ) with Gly, Ala, Val, Asp, Gly-Asp, Asp Gly, Gly-Gly and Gly-Gly-Gly using both micro-pH-metric titrations and the application of convolution-deconvolution cyclic voltammetry at 25℃ and I=0.10 mol·dm^-3 (KNO₃). Stability constants were calculated from pH-metric data using the SUPERQUAD computer program and cyclic voltammograms were collected, stored and manipulated using the EG and G CONDECON 300 software. A considerably larger ligand:metal ratio (e, g. 50:1) was possible using voltammetry. Evaluation of results from the two techniques suggests that stability constants for the species[CdL₂]and[CdL₃]are reliable when calculated fromvoltammetry while those for[CdL]are more reliable when determined by pH-metric titration.
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