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Analyzing Co-planar PCBs in Food by HRGC/HRMS with Isotopic Dilution Method
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2003, v.16 no.4, pp.325-332
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(2003). Analyzing Co-planar PCBs in Food by HRGC/HRMS with Isotopic Dilution Method. Analytical Science and Technology, 16(4), 325-332.
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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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