DETERMINATION OF SELENIUM(IV) BY CATHODIC STRIPPING VOLTAMMETRY USINGA COPPER MICROELECTRODE

Using a copper microelectrode of similar to 5-mu m diameter, the conce ntration of Se(TV) was determined by cathodic stripping voltammetry ei ther from HClO4 (0.1 M) or from NaClO4, (0.1 M) supporting electrolyte s. The preconcentration time of 15 s was chosen as optimal, and calibr ation graphs were constructed for the applied concentration interval 5 to 50 mu M. Satisfactory reproducibility was obtained, with a standar d deviation for 5 mu M concentration (n = 10) of about 4%. (C) 1997 Ac ademic Press.