Analysis of thermolabile and polar pesticides in environmental water with capillary chromatography-frit-fast atom bombardment mass spectrometry

• Published in: Water Science & Technology Vol. 38; no. 7; pp. 169 - 177
• Main Authors: Hu, Jian-ying, Aizawa, Takako, Asami, Man, Magara, Yasumoto
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York NY Elsevier Ltd 1998; Oxford Pergamon Press; IWA Publishing
• Subjects: 2,4-D; Acetates; Acetic acid; Agrochemicals; Analysis; Analysis methods; Analytical methods; Applied sciences; Bentazone; Bombardment; Detection; Detection limits; Diagnostic systems; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Environmental monitoring; environmental water; Exact sciences and technology; Frit; frit-FAB; Ions; LC-MS; Mass spectrometry; Mass spectroscopy; Natural water pollution; pesticide; Pesticides; Pollution; Pollution, environment geology; Raw water; Sensitivity; Warfarin; Water supply; Water treatment and pollution; environmental water; frit-FAB; LC-MS; Analysis; pesticide; Capillary column; Water; Gas chromatography; Chemical analysis; Coupled method; Pesticides; Water pollution; Polar compound; Mass spectrometry
• ISBN: 0080433944; 9780080433943
• ISSN: 0273-1223; 1996-9732
• DOI: 10.1016/S0273-1223(98)00619-2

Capillary LC/Frit-FAB-MS was used for the determination of 24 thermolabile and polar pesticides including 9 neutral/basic and 15 acidic ones which are not amenable to routine GC/MS. The base ions of acidic pesticides in negative mode were a deprotonated molecular ion except for asulam, MCPB, 2,4-DB, and warfarin, and those for neutral/basic pesticides and asulam in positive mode were a protonated one. More than one diagnostic ion were obtained except for hymexazol and bentazone. High sensitivity was obtained for neutral/basic pesticides and asulam by adopting a mobile phase composed of CH3CN and 0.1% acetic acid, while for the other acidic pesticides, a mobile phase composed of CH3CN and 5 mM din-butylammonium acetate (pH=6.7) was effective. The detection limits of the pesticides were in the range of 10–300 μg/l, except for benazolin whose limit was 1000 μg/l. Environmental samples (1 L) were taken from raw water for water supply and applied to analysis after concentration by using a solid phase extraction method. 0.2 μg/l dymron (in full-scan mode) and 0.05 μ/l 2,4-D (in selected ion monitoring mode) were detected in a sample, which indicated that the LC-frit-FAB-MS method could be used for determining thermolabile and polar pesticides in environmental water with relatively high sensitivity.