Data/hora: 16/06/2024 07:42:29

Biblioteca(s): 	Embrapa Pecuária Sudeste.	
Data corrente: 	03/09/1998	
Data da última atualização: 	02/09/2021	
Autoria: 	NOGUEIRA, A. R. de A.; SOUZA, G. B. de; BATISTA, L. A. R.; ARRUDA, M. A. Z.; MIYAZAWA, M.	
Afiliação: 	ANA RITA DE ARAUJO NOGUEIRA, CPPSE; GILBERTO BATISTA DE SOUZA, CPPSE; LUIZ ALBERTO ROCHA BATISTA, CPPSE; UNICAMP; Instituto Agronômico do Paraná.	
Título: 	Catalytic determination of cobalt by flow injection spectrophotometry: application in animal faeces analysis using hydrochloric acid as extracting solution.	
Ano de publicação: 	1998	
Fonte/Imprenta: 	Animal Feed Science and Technology. v.74, n.1, 1998.	
Páginas: 	p.79-84	
Idioma: 	Inglês	
Conteúdo: 	A flow injection system for cobalt determination in faeces of bovines and equines receiving CoEDTA as a tracer in animal nutrition studies is proposed, using 1.0 mol HCl lÿ1 as extracting medium, and detection by flow injection spectrophotometric procedure based on the catalytic effect of Co(II) on the oxidation of Tiron by hydrogen peroxide. Linearity was observed up to 8.0 mg Co lÿ1, and the detection limit was 0.2 mg Co lÿ1 (3 s blank). The system requires 0.12 mg Tiron per determination and handles 65 samples hÿ1. No baseline drift was observed during extended operation periods (8 h) and precise results (r.s.d.<1%) were detected. Accuracy was confirmed by running several faeces samples already analysed by flame atomic absorption spectrometry. Results related to the HCl extraction procedure were in close agreement with those obtained using the nitric-perchloric digestion (yˆ0.978x‡0.101, R2 ˆ0.9848), suggesting that HCl extraction and flow injection determination can be used routinely for rapid analysis of cobalt in faeces.	
Palavras-Chave: 	Flow injection; HCI extraction; Injeção em fluxo; Spectrophotometry.	
Thesagro: 	Cobalto; Espectrofotometria.	
Thesaurus Nal: 	cobalt.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pecuária Sudeste (CPPSE)	
Exemplares: 	CPPSE - (12149-1) - UPC - AP - DD - PROCI-1998.00095 - NOG - 1998.00095 - DIS