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In vitro monitoring of natural thorium in urine using fluorimeter.
MedLine Citation:
PMID:  22099652     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
A relatively less expensive and less time consuming radio analytical technique for quantitative determination of Th(nat) in urine at mBq level is developed and reported in this paper. Th in urine is co-precipitated with Ca(3)(PO(4))(2) from wet oxidized urine matrix and the precipitate is dissolved in HNO(3) and evaporated to dryness. The residue is dissolved in 3M HCl and 200mg of Na-EDTA is added to mask Ca(2+), Mg(2+) and Fe(3+) ions. Th(4+) is extracted into 0.01M PC-88A (2-ethyl hexyl phosphonic acid mono-2-ethylhexyl ester), dissolved in toluene from the experimentally optimized pH 2.5±0.3 in aqueous phase. Th(4+) is stripped into 8.0M HCl and evaporated to dryness. The content of the beaker is dissolved in pH 1.8 HCl and complexed with 3-hydroxy flavone. The sample is excited at 397nm and fluorescence intensity is measured at 462nm. The detailed study of the method is presented in this paper. Interference study on elements that are normally present in urine and other actinides (if present) is also given.
Authors:
S Kalaiselvan; A R Lakshmanan; V Meenakshisundaram
Publication Detail:
Type:  Journal Article     Date:  2011-10-01
Journal Detail:
Title:  Talanta     Volume:  87     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-11-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  80-4     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Affiliation:
Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India.
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