Data/hora: 24/05/2024 17:22:48

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 24/11/2004
Data da última atualização: | 31/05/2022
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.
Título: | Determination of vanadium in urine by electrothermal atomic absorption spectrometry using hot injection and preconcentration into the graphite tube.
Ano de publicação: | 2004
Fonte/Imprenta: | Journal of Braziliand Chemical Society, v.15, n.5, p.676-681, 2004.
Idioma: | Inglês
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.
Palavras-Chave: | ETAAS; Hot injecction; Preconcentration.
Thesaurus Nal: | urine; vanadium.
Categoria do assunto: | W Química e Física
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (15311-1) - UPC - AP - DD - PROCI-2001.00191 - FER - 2001.00191 - DIS