Título:	Determination of vanadium in urine by electrothermal atomic absorption spectrometry using hot injection and preconcentration into the graphite tube.
Autoria:	FERNANDES, K. G. NOGUEIRA, A. R. de A. GOMES NETO, J. A. NÓBREGA, J. A.
Afiliação:	KELLY G. FERNANDES, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; JOSÉ A. GOMES NETO, UNESP; JOAQUIM A. NÓBREGA, UFSCAR.
Ano de publicação:	2004
Referência:	Journal of Braziliand Chemical Society, v.15, n.5, p.676-681, 2004.
Conteúdo:	In this work it was developed a procedure for the determination of vanadium in urine samples by electrothermal atomic absorption spectrometry using successive injections for preconcentration into a preheated graphite tube. Three 60?L volumes were sequentially injected into the atomizer preheated to a temperature of 110 ºC. Drying and pyrolysis steps were carried out after each injection. A chemical modifier, barium difluoride (100 mg L-1), and a surfactant, Triton X-100 (0.3% v v-1), were added to the urine sample. When injecting into a hot graphite tube, the sample flow-rate was 0.5?L s-1. The limits of detection and quantification were 0.54 and 1.82 without preconcentration, and 0.11 and 0.37 ?g L-1 with preconcentration, respectively. The accuracy of the procedure was evaluated by an addition-recovery experiment employing urine samples. Recoveries varied from 96.0 to 103% for additions ranging from 0.8 to 3.5 ?g L -1 V. The developed procedure allows the determination of vanadium in urine without any sample pretreatment and with minimal dilution of the sample.
NAL Thesaurus:	Urine Vanadium
Palavras-chave:	ETAAS Preconcentration Hot injecction
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPPSE)