Positive and Negative Chemical Ionization Mass Spectra of Polychlorinated Pesticides1

  • Ralph C. Dougherty
  • J. David Roberts
  • Harvey P. Tannenbaum
  • F. J. Biros
Part of the Environmental Science Research book series (ESRH, volume 4)


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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    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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    R.C. Dougherty, J.D. Roberts and F.J. Biros, Unpublished Observations.Google Scholar
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    C. E. Melton, “Principles of Mass Spectrometry and Negative Ions,” M. Dekker, New York, 1970.Google Scholar
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    H.P. Tannenbaum, J.D. Roberts and R.C. Dougherty, Unpublished Observations.Google Scholar
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    R.C. Dougherty, J. Dalton and F.J. Biros, Org. Mass Spectrom. 6., 1171 (1972).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • Ralph C. Dougherty
    • 1
  • J. David Roberts
    • 1
  • Harvey P. Tannenbaum
    • 1
  • F. J. Biros
    • 2
  1. 1.Department of ChemistryFlorida State UniversityTallahasseeUSA
  2. 2.Primate and Pesticides Effects LaboratoryEnvironmental Protection AgencyPerrineUSA

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