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Analyzing Co-planar PCBs in Food by HRGC/HRMS with Isotopic Dilution Method  

Choi, Dongmi (Korea Food & Drug Administration)
Suh, Junghyuck (Korea Food & Drug Administration)
Kim, Minjung (Korea Food & Drug Administration)
Hong, Mooki (Korea Food & Drug Administration)
Kim, Changmin (Korea Food & Drug Administration)
Song, Insang (Korea Food & Drug Administration)
Publication Information
Analytical Science and Technology / v.16, no.4, 2003 , pp. 325-332 More about this Journal
Abstract
To analyze co-planar PCBs in food, the isotopic dilution method by high resolution gas chromatography/high resolution mass spectrometry was applied. Among 209 PCB congeners, 12 congeners (#77, #81, #126, #169, #105, #114, #118, #123, #156, #157, #167 and #189) were chosen as target compounds that were toxic congeners re-assessed by WHO in 1998. Milk and milk products including cheese and butter were collected as food samples. Samples were homogenized, spiked with the known amount of the standard mixture and extracted. After extraction, extracts were cleaned up by sulfuric acid impregnated silica gel, purified on silica gel and alumina column chromatography and then analyzed by HRGC/HRMS. As results, the overall recoveries were ranged from 83% to 106% and the limit of detection was about 0.1 pg/g at signal/noise>3. Levels of targets in the selected food samples were 0.001~0.107 pgWHO-TEQ/g.
Keywords
co-planar PCBs; isotopic dilution; food; HRGC/HRMS;
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