Reduced-pressure microwave-induced plasma mass spectrometric detection of phosphorus and sulphur in gas chromatographic eluates
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Analytical Atomic Spectrometry
- Vol. 5 (6) , 467-470
- https://doi.org/10.1039/ja9900500467
Abstract
The determination of phosphorus and sulphur at trace levels is not possible by conventional atmospheric pressure plasma mass spectrometry because of high background signals at m/z= 31 (14N16OH+) and m/z= 32 (16O2 +). The reduced-pressure plasmas decrease the background at the major isotopes of phosphorus and sulphur such that sub-nanogram detection is possible. The use of reduced-pressure helium and nitrogen microwave-induced plasmas for the determination of phosphorus and sulphur is discussed. With a helium plasma, the detection limit for phosphorus in triethyl phosphite ranges from 1 to 90 ng depending on the amount of torch cooling. Using a nitrogen plasma, sub-nanogram detection limits for phosphorus and sulphur in two organophosphorus pesticides were obtained.Keywords
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