J. Limson et T. Nyokong, SUBSTITUTED CATECHOLS AS COMPLEXING AGENTS FOR THE DETERMINATION OF BISMUTH, LEAD, COPPER AND CADMIUM BY ADSORPTIVE STRIPPING VOLTAMMETRY, Analytica chimica acta, 344(1-2), 1997, pp. 87-95
Copper, cadmium, lead and bismuth (>5 mu g ml(-1)) are determined by a
dsorptive cathodic stripping voltammetry (AdCSV) on a mercury film gla
ssy carbon electrode, using catechol, 4-methylcatechol, 4-t-butylcatec
hol and resorcinol as complexing Ligands. Complexes of lead, copper an
d bismuth with resorcinol showed the largest increase in current with
increase in metal concentration, whereas complexes of these metals wit
h 4-t-butylcatechol showed the lowest current response. Cadmium showed
a different behaviour from the other three metals in that the highest
current response was observed with 4-methylcatechol. The four metals
could be determined simultaneously in the presence of resorcinol, alth
ough considerable interference was observed between bismuth and copper
.