Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/197870
Type: Artigo de periódico
Title: Improvements In Cobalt Determination By Thermospray Flame Furnace Atomic Absorption Spectrometry Using An On-line Derivatization Strategy.
Author: Matos, Geraldo Domingues
Arruda, Marco Aurélio Zezzi
Abstract: An on-line derivatization strategy was developed for improving cobalt sensitivity using thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) as the analytical technique. This strategy involves the generation of a volatile cobalt compound, providing better sample vaporization efficiency. The effect of sodium diethyldithiocarbamate (DDTC) as complexing agent on the integrated absorbance signal was evaluated. Parameters including the pH of complex formation, complex concentration and volume, sample volume, flame gas composition and tube atomization configuration were optimized. A wide linear range (from 23 microg L(-1) to 3 mg L(-1); r(2)=0.9786) was obtained, with the best one (r(2)=0.9992) attained from 23 to 400 microg L(-1) with a sample throughput of 30 h(-1). The improvement in the detection power was 17-fold when compared to FAAS, which provides 7 microg L(-1) as the limit of detection when considered TS-FF-AAS technique. A relative standard deviation (n=10) of 4% for a cobalt solution containing 50 microg L(-1) was attained, and the accuracy of the procedure was evaluated through certified reference materials (IAEA-SL-1, lake sediment; and ISS-MURST-A1, Antarctic marine sediment). Good agreement between the results at the 95% confidence level was observed.
Subject: Cobalt
Ditiocarb
Reference Standards
Reproducibility Of Results
Spectrophotometry, Atomic
Rights: fechado
Identifier DOI: 10.1016/j.talanta.2008.03.001
Address: http://www.ncbi.nlm.nih.gov/pubmed/18585309
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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