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Application of Doehlert matrix to the study of flow injection procedure for selenium (IV) determination
1Département de Chimie, Institut National des Sciences Appliquées et de Technologie, B.P. 676, Tunis Cedex 1080, Tunisia; Département de Chimie, Laboratoire de Chimie Analytique et Electrochimie, Faculté des Sciences de Tunis, Campus Universitaire, 1060 Tunis, Tunisia.
Abstract:
A method for the rapid determination of selenium is reported. It is based on the injection of selenium sample into a stream of KI and subsequent measurement of the increase of the absorption at 290nm due to the formation of I(3)(-). A Doehlert matrix was applied for the determination of the optimal working conditions. With the developed method, a linear calibration curve from 1 to 10ppm was obtained. For the analysis of semiconducting thin layers of CuInSe(2) (CIS), a cationic resin was added to the sample solution in order to eliminate the effect of copper and indium on the absorbance values. With the developed procedure a sample throughput of 36 samples per hour and a relative standard deviation 1.1% was achieved.
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