Determination of vanadium in biological and environmental samples by RNAA with emphasis on quality control |
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| Authors: | U Repinc L Benedik V Stibilj |
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| Institution: | (1) Department of Environmental Sciences, Joǽef Stefan Institute, Ljubljana-1000, Slovenia;(2) Department of Environmental Sciences, Joǽef Stefan Institute, Ljubljana-1000, Slovenia;(3) Department of Environmental Sciences, Joǽef Stefan Institute, Ljubljana-1000, Slovenia |
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| Abstract: | Summary In the present work an improvement of radiochemical neutron activation analysis for determination of nanogram levels of vanadium is described. The method is based on post-irradiation wet ashing and solvent extraction of vanadium with N-benzoyl-N-phenyl-hydroxylamine (BPHA) forming a violet chelate complex in strongly acidic medium. For quality assurance purposes a procedure for determination of the overall chemical yield using spectrophotometry of the V-BPHA complex is described, and possible interferences are evaluated. The procedure was applied to the determination of vanadium in reference materials and selected food samples from Slovenia. |
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