Direct determination of selenium in selenomethionine using on-line oxidation-reduction Hydride Generation inductively coupled plasma atomic emission spectrometry

摘要

A novel interface for on-line-oxidation-reduction-hydride generation has been developed. A new method is proposed for direct determination of selenium in selenomethionine (SeMet) by on-line-oxidation-reduction-hydride generation inductively coupled plasma atomic emission spectrometry. The on-line conversion of SeMet's selenium (-II) returned to inorganic selenium can be done with superfluous acidic KMnO_4, then KMnO_4 is deoxidized by oxalic acid. Iodide Potassium and thiourea have better enhanced sensitivity of selenate. The method excludes any off-line chemical pretreatment prior to Hydride Generation (HG), which is very promising and successfully determined selenium content in SeMet, validation of this simple on-line continuous flowing system will be carried out by analyzing organic selenium. The detection limit （3o of blank) of the methods is 0.12 μg L~(-1) '. The relative standard deviation is 7.2% for standard selenomethionine as Se 50 μg L~(-1).