6533b7d6fe1ef96bd1266e70

RESEARCH PRODUCT

Speciation of selenium and tellurium in milk by hydride generation atomic fluorescence spectrometry

M. Luisa CerveraCarmen TeutschAlberto De La GuardiaPatricia Cava-montesinosMiguel De La Guardia

subject

Detection limitHydrideSonicationAnalytical chemistrychemistry.chemical_elementAnalytical Chemistrychemistry.chemical_compoundchemistryOxidation stateAqua regiaLeaching (metallurgy)TelluriumSpectroscopySelenium

description

A simple, fast and highly sensitive method has been developed for the differentiation of Se and Te into their (IV) and (VI) oxidation states in milk samples by HG-AFS. This procedure involves a previous leaching of milk slurries by sonication with aqua regia for 10 min. Se(IV) and Te(IV) were determined by analysis of the samples without a pre-reduction step; being total Se and Te determined after reduction with KBr. The method provides limit of detection values (LOD) of 0.012 and 0.023 ng ml−1 for Se(IV) and Te(IV) respectively. Average relative standard deviation values of 10.5%, 3.9%, 12% and 12.5% were found for the determination of Se(IV), Se(VI), Te(IV) and Te(VI) in milk samples containing Se from 11.1 to 32.2 ng g−1 and Te from 1.1 to 10 ng g−1. Recovery experiments made on actual samples spiked with Se(IV), Se(VI), Te(IV) and Te(VI) evidenced that the sonication with aqua regia does not modify the oxidation state of the elements considered.

yearjournalcountryeditionlanguage
2004-01-01Journal of Analytical Atomic Spectrometry
https://doi.org/10.1039/b310145b