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Electromembrane extraction and spectrophotometric determination of As(V) in water samples
Mohammad Ali Kamyabi1, Ali Aghaei1
1Department of Chemistry, Faculty of Science, University of Zanjan, 45371-38791 Zanjan, Iran.
Abstract:
In this study, for the first time electromembrane extraction (EME) was used as a highly efficient sample pre-treatment method for the UV-VIS spectrophotometric determination of As(V) in water samples. The influences of experimental parameters during EME were investigated and optimized using one-variable-at-a-time methodology as follows: organic solvent: 1-octanol+2.5% (V/V) di-(2-ethylhexyl) phosphate, applied voltage: 70V, extraction time: 15min, pH of acceptor: 13, stirring rate: 750rpm. The method allowed the determination of As(V) in the range of 5-300ngmL(-1). The relative standard deviation was found to be within the range of 3.4-7.6%. The limit of detection, corresponding to a signal to noise ratio of three, was 1.5ngmL(-1). The proposed method was finally applied to the determination of As(V) in water samples and relative recoveries ranging from 95 to 102% were obtained.
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