Positive and Negative Chemical Ionization Mass Spectra of Polychlorinated Pesticides1
Chemical ionization (CI) and negative chemical ionization (NCI) mass spectra generally show substantially less fragmentation than their electron impact (EI) counterparts. 2 Consequently,+the relative intensity of ions with high information content, e.g. MH , is often higher in CI than in EI spectra. The simplicity and sensitivity of the CI spectra of drugs have resulted in the successful use of chemical ionization in the screening of crude extracts of biological fluids for drugs and poisons. 3 The extension of these methods to pesticide residue analysis is obvious but not necessarily direct.
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- 1).This work has been supported by a grant from the National Science Foundation and has been conducted under the partial auspices of the U. S. Environmental Protection Agency.Google Scholar
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