title: Speciation analysis of selenium in natural water using square-wave voltammetry after preconcentration on activated carbon.
abstract: A simple, accurate, sensitive and selective method was described for rapid determination of ultra-trace quantities of selenium. Selenium(IV) was collected on activated carbon (AC) after reduction to elemental Se by l-ascorbic acid. The collected selenium was then dissolved by oxidation reaction with bromate in acidic media and was indirectly determined through the bromide formation using square-wave voltammetry (OSWV). The total amount of Se(IV) and Se(VI) was collected on AC after its reduction by hydrazine. Selenium in the range 0.01-20 microg L(-1) could be determined by this method. The method was used to the determination of Se(IV) and Se(VI) in natural water with satisfactory results.
authors.affiliation: Department of Chemistry, National University of San Luis, Chacabuco y Pedernera, 5700 San Luis, Argentina.
authors.forename: Franco A
authors.initials: FA
authors.lastname: Bertolino
authors.forename: Angel A J
authors.initials: AA
authors.lastname: Torriero
authors.forename: Eloy
authors.initials: E
authors.lastname: Salinas
authors.forename: Roberto
authors.initials: R
authors.lastname: Olsina
authors.forename: Luis D
authors.initials: LD
authors.lastname: Martinez
authors.forename: Julio
authors.initials: J
authors.lastname: Raba