Determination of selenium in drinking water by fluorimetric method

INTRODUCTION

Lumex Instruments provides sensitive and selective fluorimetric method for the measurement of mass concentration of selenium in drinking water samples using the FLUORAT-02 analyzer.

METHOD

The fluorimetric method is based on formation of a complex compound between selenite ion and 2,3-diaminonaphthalene in acid medium, further extraction of this compound with hexane followed by measurement of fluorescence intensity of the extract using FLUORAT-02 analyzer displayed as selenium concentration in μg/l. The result appears on the PC-operated FLUORATE software.

Prior to analysis samples should be pretreated to convert hydroselenide, selenate ions and selenium from organoselenium compounds into selenite ion.

Samples need to be preserved by addition of nitric acid. Preserved sample can be stored up to 1 month before analysis.