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Title of Journal: Microchim Acta

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Abbravation: Microchimica Acta

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Springer-Verlag

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DOI

10.1002/chin.200838051

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1436-5073

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A PreConcentration Procedure Using Cloud Point Ex

Authors: Marcos de A Bezerra André L B Conceição Sérgio L C Ferreira
Publish Date: 2006/02/09
Volume: 154, Issue: 1-2, Pages: 149-152
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Abstract

This paper describes the development of a cloud point extraction procedure for the determination of manganese in saline effluents by flame atomic absorption spectrometry FAAS The optimization step was performed using the Doehlert matrix involving the following variables buffer concentration pH and centrifugation time The validation process was assessed as parameters of the analytical curve precision effect of other ions in the proposed procedure robustness test and accuracy The proposed procedure allows the determination of manganese with a detection limit 3δ/S of 060 µg L−1 and a precision expressed as relative standard deviation RSD of 22 n = 8 and 15 n = 8 for a manganese concentration of 1 and 5 µg L−1 respectively The preconcentration factor obtained was 84 The recovery achieved for the determination of manganese in the presence of several other metal ions demonstrated that this procedure could be satisfactorily applied to the analysis of environmental samples The accuracy was confirmed by the analysis of CRM trace elements in water NIST 1643d This procedure was applied to the determination of manganese in saline effluents of a petroleum refinery For three analyzed samples the manganese content varied between 449 and 679 µg L−1

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