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Type: Artigo de periódico
Title: Catalytic determination of cobalt by flow injection spectrophotometry: application in animal faeces analysis using hydrochloric acid as extracting solution
Author: Nogueira, ARA
Souza, GB
Batista, LAR
Arruda, MAZ
Miyazawa, M
Abstract: A flow injection system for cobalt determination in faeces of bovines and equines receiving Co-EDTA as a tracer in animal nutrition studies is proposed, using 1.0 mol HCl l(-1) 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 mu g Co l(-1), and the detection limit was 0.2 mu g Co l(-1) (3 s blank). The system requires 0.12 mg Tiron per determination and handles 65 samples h(-1). No baseline drift was observed during extended operation periods (8 h) and precise results (r.s.d.<l%) 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 (y=0.978x+0.101, R-2=0.9848), suggesting that HCl extraction and flow injection determination can be used routinely for rapid analysis of cobalt in faeces, (C) 1998 Elsevier Science B.V.
Subject: cobalt
flow injection
HCl extraction
Country: Holanda
Editor: Elsevier Science Bv
Citation: Animal Feed Science And Technology. Elsevier Science Bv, v. 74, n. 1, n. 79, n. 84, 1998.
Rights: fechado
Identifier DOI: 10.1016/S0377-8401(98)00159-X
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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