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Atmospheric Pressure Ionisation Multiple Mass Spectrometric Analysis of Pesticides by Daniela Baglio; Dimitrios Kotzias; Bo Richter Larsen is a Chemistry article available to read on EtoBox.

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Liquid chromatography-multiple mass spectrometry (LC-MS ) has been investigated for analysis of polar pesticides in water using an ion-trap instrument and atmospheric pressure ionisation. Carbamate, triazine and phenylurea pesticides were best ionised as positive ions with atmospheric pressure chemical ionisation, while phenoxy acid herbicides, nitrophenols and bentazone yielded stronger signals as negative ions with pneumatically assisted electrospray. The ion fragmentation 2 3 4 processes and pathways were studied in detail by MS, MS , MS and MS . All compounds were observed as their n protonised or deprotonised molecular ions by MS and in the successive fragmentation by MS the structures of typical 2 (diagnostic) product ions were tentatively identified for each class of pesticide. Phenylureas yield an ion at m /z 72 by MS , 1 1 2 corresponding to O5C5N (CH ) . Carbamates produce [M1H-CONCH ] fragments by MS from neutral loss of 3 2 3 1 methylisocyanate. Characteristic fragmentation pathways for triazine pesticides are [M1H] →m /z 174→m /z 146→m /z 110 1 2 3 4 and [M1H] →m /z 174→m /z 132→m /z 104 by MS-MS -MS -MS from cleavage of lateral chains in the triazine ring 2 followed b

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Author

Daniela Baglio; Dimitrios Kotzias; Bo Richter Larsen

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

1999

Language

EN

Field

Chemistry (Physical Sciences)