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Cadmium and lead complexation by anodic stripping voltammetry with a mercury microelectrode
Author(s) -
Correia dos santos Margarida M.,
Goņalves Maria L. Simões,
Capelo Sofia
Publication year - 1996
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140080216
Subject(s) - mercury (programming language) , cadmium , anodic stripping voltammetry , microelectrode , chemistry , voltammetry , inorganic chemistry , electrochemistry , electrode , computer science , organic chemistry , programming language
Complexation reactions of lead by glutamic acid in KNO 3 0.1 M and cadmium by glycine at two ionic strengths (0.1 MKNO 3 and 2 × 10 −3 M borate buffer) have been used to : 1) compare the stripping response in DCASV (direct current anodic stripping voltammetry) and DPASV (differential pulse anodic stripping voltammetry) at large (hanging mercury drop electrode: HMDE) and small (thin film mercury microelectrode deposited on Pt/lr: μME) electrodes, 2) test classical DeFord‐Hume's method with microelectrodes coupled to DCASV and DPASV, and 3) analyze the suitability of both electrodes HMDE and μME coupled to anodic stripping voltammetry to measurements in freshwaters. Indeed due to the mass transport characteristics at microelectrodes, the fraction of a metal which contributes to the current may well be different from that at a conventional size electrode. The obtained results are in all the situations consistent among themselves and in good agreement with literature.