Sh. Tan et Sp. Kounaves, DETERMINATION OF SELENIUM(IV) AT A MICROFABRICATED GOLD ULTRAMICROELECTRODE ARRAY USING SQUARE-WAVE ANODIC-STRIPPING VOLTAMMETRY, Electroanalysis, 10(6), 1998, pp. 364-368
The voltammetric determination of selenium(rv) using a microfabricated
array of gold ultramicroelectrodes (Au UMEs) is presented. The array
of Au UMEs in conjunction with square wave anodic stripping voltammetr
y shows a rapid, sensitive and reproducible response for selenium. Usi
ng an array of UMEs overcomes the inherent disadvantage of measuring t
he very low current signals present when using a single UME. The exper
imental parameters that affect the response of selenium: deposition po
tential, selection of the electrolyte solution, SW frequency, and depo
sition time were investigated. The Se redox reaction appears to be kin
etically faster and more reversible at the An UME array than at Au mac
roelectrode or single Au UME. Calibration plots are given for solution
s containing 0-100 ppb and 100-500 ppb. The limit of detection is calc
ulated to be 0.42 ppb. The relative standard deviation at 50 ppb is 4.
5 % for 10 runs.