Sensitive determination of selenium by inductively coupled plasma mass spectrometry with flow injection and hydride generation in the presence of organic solvents

The role of some organic solvents in polyatomic interference suppression and signal enhancement for selenium determination by flow injection hydride generation inductively coupled plasma mass spectrometry (FI-HG-ICP-MS) was investigated. The organic solvents under investigation included methanol, et...

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Published inJournal of analytical atomic spectrometry Vol. 10; no. 10; pp. 865 - 870
Main Authors MUNOZ OLIVAS, R, QUETEL, C. R, DONARD, O. F. X
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 1995
Subjects
Analytical chemistry
Chemical Sciences
Chemistry
Exact sciences and technology
Spectrometric and optical methods
Trace analysis
Water
Solvent effect
Chemical analysis
Interelement effect
Coupled method
Pneumatic nebulization
Inductive coupling plasma spectrometry
Hydridation
Organic solvent
Sensitivity
Selenium
Mass spectrometry
Flow injection
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Summary:The role of some organic solvents in polyatomic interference suppression and signal enhancement for selenium determination by flow injection hydride generation inductively coupled plasma mass spectrometry (FI-HG-ICP-MS) was investigated. The organic solvents under investigation included methanol, ethanol, propanol, acetone and acetonitrile. Two sample introduction modes were studied; pneumatic nebulization and hydride generation (by an FI system). Alcohol addition caused an important reduction of polyatomic interferences and a 10-fold enhancement of the selenium signal. Under optimal conditions, which included sodium borohydride (0.2 per cent) for hydride generation, pH 1.0 and methanol (6 per cent), selenium determination by FI-HG-ICP-MS gave detection limits of 1 pg for a 200 ul sample loop with an average relative standard deviation of better than 2 per cent under routine conditions. This procedure was validated by participation in a certification campaign for inorganic selenium speciation organized by the EC Community Bureau of Reference (BCR). This technique was also applied to the direct determination of dissolved selenium(IV) in natural waters from the Gironde estuary, France.
Bibliography:ObjectType-Article-2
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ISSN:0267-9477
1364-5544
DOI:10.1039/JA9951000865