Direct determination of vanadium in high saline produced waters from offshore petroleum exploration by electrothermal atomic absorption spectrometry

被引:22
作者
Cassella, RJ [1 ]
Oliveira, EP
Magalhaes, OIB
机构
[1] Univ Fed Fluminense, Dept Quim Analit, BR-24020007 Niteroi, RJ, Brazil
[2] Univ Fed Fluminense, Programa PosGrad Geoquim, BR-24020007 Niteroi, RJ, Brazil
关键词
vanadium; produced waters; electrothermal atomic absorption spectrometry; chemical modifiers;
D O I
10.1016/j.talanta.2005.08.046
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The present work reports the development of a methodology for the direct determination of vanadium in high saline waters derived from offshore petroleum exploration employing electrothermal atomic absorption spectrometry. Such waters, usually called produced waters, present complex composition containing various organic and inorganic substances. In order to attain best conditions (highest sensitivity besides lowest background) for the methodology, studies about the effects of several variables (evaluation of pyrolysis and atomization temperatures, type of chemical modifier, concentration of modifier and pyrolysis time) and the convenient calibration strategy were performed. Best conditions were reached with the addition of 10 mu g of NH4H2PO4 as chemical modifier employing pyrolysis (during 10s) and atornization temperatures of 1500 and 2700 degrees C, respectively. Obtained results indicated that, in this kind of sample, vanadium can be determined by standard addition method or employing an external calibration approach with standard solutions prepared in 0.8 mol l(-1) NaCl medium. In order to evaluate possible matrix interferences, a recovery test was performed with five spiked samples of produced waters. The limit of detection, limit of quantification and relative standard deviation in 0.8 mol l(-1) NaCl medium were also calculated and the derived values were 1.9 mu g l(-1), 6.3 mu g l(-1) and 5.6% (at 10 mu g l(-1) level), respectively. (c) 2005 Published by Elsevier B.V.
引用
收藏
页码:48 / 54
页数:7
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