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Variability of the slopes of standard addition plots in the analysis of copper in seawater by anodic stripping voltammetry
Author(s) -
SánchezMisiego Antonio,
Carra Rosa GarcíaMoncó,
Zirino Alberto
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.1140080607
Subject(s) - anodic stripping voltammetry , seawater , copper , voltammetry , linear sweep voltammetry , chemistry , analytical chemistry (journal) , stripping (fiber) , inorganic chemistry , artificial seawater , ethylenediamine , electrode , cyclic voltammetry , electrochemistry , materials science , environmental chemistry , oceanography , organic chemistry , composite material , geology
Copper in seawater was analyzed with a ‘hybrid’ mercury film‐glassy carbon electrode using linear sweep, square wave and differential pulse anodic stripping voltammetry. The analyses were made in HCl (pH 2) and ethylenediamine (EN)‐spiked seawater (9 < pH < 10), with and without purging the sample of dissolved oxygen. The relative slopes of the standard addition plots were used to determine the effect of mode and media alteration on the results. Square‐wave voltammetry in EN‐altered seawater, without oxygen purging, was found to be not only the most practical technique, but also highly sensitive. The ‘chemistry’ of the oxidation reaction during the stripping step was found to affect the experimental results markedly. For this reason, the peak current is an experimentally dependent measure of the ion flux, both, into and out of the electrode.