1 0240/ 1 0241 negative chemical ionization spectra of TCDDs [12]. Conversely, no mechanism similarto the formation of a dichlorobenzoquinone anion of TCDD [lo] was detected for the three TCDF isomers.Also, no molecular anion was observed for any of the TCDF isomers investigated.Summarizing, a 50 m SP2100 column in combination with API-MS was found to separate and detect 2,4,6,8-TCDF, 2,3,6,8-TCDF, 2,3,7,8-TCDF, and 2,3,7,8-TCDD. In addition, the anions formed from the TCDFs did not interfere with the determination of 2,3,7,8-TCDD by API-MS.
AcknowledgmentWe are grateful to L. Smith and D. L. Stalling (USDI, Columbia National Fisheries Research Laboratory, MO.) for the three TCDF isomers.
References
[I][2]
SummaryPolydiethylene glycol adipate (DEGA) has been successfully used as stationary phase for residue analysis by glass capillary gas chromatography. A specially stabilized version of the phase yields a good polar column which is stable up to 25OOC when used in temperature programmed cycles. The paper lists 90 pesticides that have been successfully chromatographed in ng quantities on a DEGA column.
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