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2E-O1-0930 PDF
起源未知ミックスハロゲン化ダイオキシン類の構造解析と濃縮性評価
We screened mixed halogenated (brominated/chlorinated) dibenzo-p-dioxins/dibenzofurans (PXDD/Fs, X = Br and Cl) in marine sediments and bivalves collected from Seto Inland Sea, Japan, using two-dimensional gas chromatograph–time-of-flight mass spectrometer (GC×GC–ToFMS) and gas chromatograph–high resolution magnetic sector mass spectrometer (GC–HRMS). In addition to anthropogenic PCDD/Fs, natural PBDDs (e.g. 1,3,7-/1,3,8-TriBDDs) and unknown PXDDs were detected in marine sediment and bivalve samples. By analyzing the accurate mass, halogen isotope ratio, and fragment pattern of PXDDs, they were identified as dibromo/monochloro dioxins (DiBMoCDDs). Interestingly, biota–sediment accumulation factors (BSAFs) of DiBMoCDDs and 1,3,7-/1,3,8-TriBDDs were clearly higher than those of major PCDD/F congeners. This result suggests that DiBMoCDDs are derived from natural origin(s) as well as 1,3,7-/1,3,7-TriBDDs.