Application of Doehlert matrix to the study of flow injection procedure for selenium (IV) determination.
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.
Hellal
F
F
Département 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.
Dachraoui
M
M