Diffuse reflectance determination of Malachite Green using polyurethane foam as solid support and sodium dodecylsulfate as counter ion

TALANTA

卷:85

Article

Robaina, Nicolle F.¹  dos Reis, Luis Gustavo T.¹  Cassella, Ricardo J.¹ 

[1] Univ Fed Fluminense, Dept Quim Analit, BR-24020141 Niteroi, RJ, Brazil

关键词: Diffuse reflectance;    Polyurethane foam;    Malachite Green;    Water;   

DOI  :  10.1016/j.talanta.2011.04.065

来源: Elsevier

【 摘 要 】

This paper reports the use of polyurethane foam (PUF) as solid support for diffuse reflectance spectrophotometric determination of Malachite Green (MG), a well known cationic dye used as biocide in the aquaculture industry, using sodium dodecylsulfate (SDS) as a counter ion. The method was based on the formation of an ionic-pair between the dye and the anionic surfactant SDS, which was sorbed onto PUF surface, where the diffuse reflectance was measured at 635 nm. Several parameters that could affect the performance of the system were evaluated. As expected, the SDS concentration presented strong influence on the analytical signal because the PUF was able to retain only the ionic-pair. The pH influenced the analytical signal, which was more intense in the acidic/neutral range, while the ionic strength only influenced the kinetic of the MG (as MG-SDS ionic-pair) sorption. The methodology was employed in the determination of MG in river waters and a recovery test was performed to test the accuracy of the procedure. Recovery percentages between 98.7 and 107% were observed when 60 or 80 mu g L(-1) of MG were added to the samples. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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