The negative ion chemical ionization mass spectra of polychlorinated dibenzo‐p‐dioxins using oxygen, methane and methane/oxygen are reported together with their methane positive ion chemical ionization mass spectra and conventional electron impact spectra. The methane/oxygen negative ion chemical ionization mass spectra proved to be the most useful of the negative ion spectra for structure determination.
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Hass et al. (1979) studied this question.
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