Data/hora: 03/06/2024 15:55:00

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