01880naa a2200265 a 450000100080000000500110000800800410001910000260006024501840008626000090027030000120027952010560029165000110134765000120135865000230137065300190139365300190141265300230143165300220145470000200147670000220149670000210151870000170153977300580155610442042021-09-02       1998    bl uuuu     u00u1 u    #d1 aNOGUEIRA, A. R. de A.  aCatalytic determination of cobalt by flow injection spectrophotometrybapplication in animal faeces analysis using hydrochloric acid as extracting solution.h[electronic resource]  c1998  ap.79-84  aA 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.&lt1%) 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.  acobalt  aCobalto  aEspectrofotometria  aFlow injection  aHCI extraction  aInjeção em fluxo  aSpectrophotometry1 aSOUZA, G. B. de1 aBATISTA, L. A. R.1 aARRUDA, M. A. Z.1 aMIYAZAWA, M.  tAnimal Feed Science and Technology.gv.74, n.1, 1998.