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Resumo(s)
A double-line sequential injection system was
developed for the spectrophotometric
determination of several metal ions in waters. The proposed double-line configuration was used to enable adding sample and chromogenic reagents
as merging zones. The methodology was applied
to the spectrophotometric determination of copper, iron, manganese, and zinc in samples of diverse origins at the range of 0.15–5.00, 0.10–10.0, 0.48–4.00, and 0.11–5.00 mg/L, respectively. Different chromogenic reagents and detection
wavelengths were used. The chromogenic
reagents for iron and manganese were
1,10-phenanthroline and formaldoxime,
respectively. Copper and zinc were both
determined using the analytical reagent zincon. Analytical characteristics of the methodology, such as manifold parameters, buffer pH, and reagent concentrations were optimized, and interference of some of the metal ions commonly present in water sample was assessed. Results of the analysis were
in agreement with those obtained by atomic
absorption spectrometry. Repeatability, expressed as the relative standard deviation for 10 consecutive injections of water samples, was lower than 6%. The determination rate was approximately 36/h.
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Citação
MORAIS, Inês P. A. ; SOUTO, M. Renata S. ; RANGEL - A double-line sequential injection system for the spectrophotometric determination of copper, iron, manganese, and zinc in waters. Journal of AOAC International. ISSN 1060-3271. Vol. 88, n.º 2 (2005), p. 639-344
Editora
AOAC International