A fully automated system for inorganic antimony preconcentration and speciation in urine.
Anal Chim Acta
; 603(1): 1-7, 2007 Nov 05.
Article
em En
| MEDLINE
| ID: mdl-17950050
A study was undertaken to ascertain the analytical capabilities of L-methionine immobilized on controlled pore glass for Sb preconcentration and speciation. A fully automated on-line system, implemented with hydride generation (HG) and inductively coupled plasma optical emission spectrometry (ICP OES), was used. Sb(III), at pH 10 was selectively retained in the column containing the immobilized aminoacid, while Sb(V) was not retained at all. A 30% HCl solution was used as eluent agent. Prior to total Sb determination, a pre-reduction step with thiourea was necessary. An on-line pH adjusting and pre-reduction of Sb(V) was achieved in a fully automated system. The detection limit for the preconcentration of 10 mL of an aqueous solution was 70 ng L(-1) with a relative standard deviation of 2%. An enrichment factor of 20 was achieved when 10 mL of sample was passed through the system, reaching a throughput of 23 samples per hour. The method was successfully applied to the determination of Sb(III) and total Sb in urine.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Técnicas de Química Analítica
/
Antimônio
Limite:
Humans
Idioma:
En
Revista:
Anal Chim Acta
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Argentina
País de publicação:
Holanda