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Online preconcentration-IC-ICP-MS for Selenium quantification and speciation at ultra-traces.
MedLine Citation:
PMID:  23020752     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Selenium (Se) is of key importance to human health with a very narrow concentration range of optimal dietary intake. Due to the inherent analytical challenge linked with the low natural abundance, information on precise and accurate Se speciation in deficient environments is hardly existent. This study presents a novel approach to determine Se species-specifically at ultra-traces, by online coupling of a preconcentration (trap) column to an Ion Chromatography Inductively Coupled Plasma Mass Spectrometry (IC-ICP-MS) system. It is demonstrated that with this robust and work/time efficient method, the predominant selenium oxyanions, selenite (SeIV) and selenate (SeVI), can be quantified down to 7.3 and 8.3 picogram total Se, respectively, in an overall analytical time of 420 seconds, only. The applicability for environmental samples was proven on pristine volcanic ashes collected from 7 different volcanoes. The high sensitivity of the novel approach firstly allowed to determine speciation in samples that were strongly depleted in total selenium (<0.05 mg kg-1 Se) with only minor fractions of Se mobilized (i.e. less than 10% of the total selenium was leached in 10 out of 12 samples). The studied samples showed considerate differences in selenium speciation, with selenite and selenate co-occurring in most samples. The fact that the studied sample leachates had a wide range of pH (3.78 to 9.55) and major anion/ cation composition underlined the versatility and wide potential application range of the method presented.
Authors:
Markus Lenz; Geerke H Floor; Lenny Winkel; Gabriela Roman Ross; Philippe F-X Corvini
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-1
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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