Negative ion mass spectra obtained under chemical ionization conditions (NCI) employing methane, isobutane or methylene chloride as the enhancement gas are presented for a series of chlorinated polycyclic insecticides. All of the compounds examined except 1-hydroxychlordene yielded molecular anions of substantial relative abundance (6 to 39 %). The most significant features of the 1171
Positive and negative isobutane chemical ionization mass spectra appear to offer several advantages over electron impact mass spectra for the analysis of aromatic chlorinated pesticides. The techniques are truly complementary and 58 .
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