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Liquid chromatography pultiple mass spectrometry with atmospheric pressure ionisation and ion-trap instruments is a potentially useful technique for structure elucidation of polar pestcides and their degradation products. The major drawback today is the lack of spectral libraries and our limited knowledge on collision induced dissociation processes. The present paper gives an introduction to this area of research and presents interesting examples of fragmentation pathaways for protonated and deprotonated ions obtained by atmospheric pressure chemical ionisation (APCI) and electrospray ionisation (ESI).

Ion-trap multiple mass spectrometry in pesticide analysis