Speciation of selenium (IV) in natural waters by solid phase spectrophotometry

Abstract

A method for the speciation of selenium (IV) based on solid-phase spectrophotometry (SPS), has been developed. In acidic conditions selenium (IV) oxidizes potassium iodide and the I 3 − forms an ionic association with Rhodamine B (RB) which is fixed on a dextran type lipophilic gel. The gel phase absorbances at 590 and 800 nm are measured directly, and allows for the determination of selenium (IV) in the range of 0.7 -18.0 mg l − 1 , with a relative standard deviation (RSD) of 2.8%. The method has been applied to the determination of Se(IV) in natural waters.

Inorganic selenium speciation in groundwaters by solid phase extraction on Dowex 1X2

“…The detection limit of 5.6 ng/L is also much better than many other reported methods [29,30,[33][34][35]. Therefore, this method can be applied to determine the inorganic chemical species of selenium in freshwaters.…”

Solvent Extraction, Spectrophotometric Determination of Selenium (Iv) at Microgram Level Using O-Methylphenyl Thiourea as a Sensitive Reagent: Analysis of Pharmaceuticals, Synthetic Mixtures and Real Samples

“…[21,22] Spectrophotometric determination of selenium (IV) has been studied recently by catalytic kinetic determination [23][24][25][26][27][28][29][30] and flow injection kinetic determination. [31] Also a huge literature is available for direct spectrophotometric determination of selenium (IV) using various reagents.…”

Higher quaternary ammonium salts with the sterically accessible exchange center: application for development of Selenate selective electrodes

“…For selenium determination, the following methods are currently in use: atomic adsorption spectroscopy, partition and ionic chromatography, stripping voltammetry, kinetic, fluorescent, photometric analysis, gas chromatography-mass spectrometry etc, as described in [1][2][3][4][5][6][7]. Despite the high sensitivity (approximately 10 -6 -10 -5 mg/L), these methods often prove inefficient for direct selenium determination in complex objects.…”