SUB-STOICHIOMETRIC ISOTOPE-DILUTION ANALYSIS FOR THE DETERMINATION OFSELENIUM BY LIQUID SCINTILLATION-COUNTING

Citation
A. Ramesh et al., SUB-STOICHIOMETRIC ISOTOPE-DILUTION ANALYSIS FOR THE DETERMINATION OFSELENIUM BY LIQUID SCINTILLATION-COUNTING, Analyst, 119(9), 1994, pp. 2067-2070
Citations number
15
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
00032654
Volume
119
Issue
9
Year of publication
1994
Pages
2067 - 2070
Database
ISI
SICI code
0003-2654(1994)119:9<2067:SIAFTD>2.0.ZU;2-B
Abstract
A sensitive and selective sub-stoichiometric isotope dilution method f or the determination of trace amounts of selenium is described. The me thod is based on the extraction of the selenium-dithizone complex with a sub-stoichiometric amount of dithizone into toluene from 7 mol l(-1 ) hydrochloric acid. The activity of the extracted complex was measure d by liquid scintillation counting and the counting efficiency was fou nd to be 40%. The calibration graph was linear in the range 0-10 mu g of selenium in a final volume of 10 ml. As little as 0.01 mu g of sele nium can be determined in a total volume of 10 ml. The interferences d ue to several ions were overcome by using an aluminium hydroxide colle ction procedure.