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Laser desorption/ionization coupled to tandem mass spectrometry for real‐time monitoring of paraquat on the surface of environmental particles
Author(s) -
Lazar Alexandru C.,
Reilly Peter T. A.,
Whitten William B.,
Ramsey J. Michael
Publication year - 2000
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/1097-0231(20000830)14:16<1523::aid-rcm58>3.0.co;2-6
Subject(s) - chemistry , paraquat , mass spectrometry , tandem mass spectrometry , desorption , tandem , ambient ionization , analytical chemistry (journal) , chromatography , ionization , environmental chemistry , chemical ionization , ion , adsorption , aerospace engineering , organic chemistry , engineering
Aerosol mass spectrometry with laser desorption/ionization was investigated as a possible tool for real‐time monitoring of the presence of the pesticide paraquat on the surface of airborne soil particles. Laser desorption/ionization of paraquat dication produced only singly charged ions. The most abundant species were [M] +· , [M − H] + , and [M − CH3] + . Operation of the ion trap mass spectrometer in the MS 3 mode allowed the reduction of the signal dependence on laser fluence fluctuations and permitted the detection of the analyte with good sensitivity and high selectivity. The estimated limit of detection in terms of surface coverage was 0.016 monolayers, approximately 1 attomole of paraquat on the surface of a single micron‐sized soil particle. Copyright © 2000 John Wiley & Sons, Ltd.