宍道湖における水鳥,魚類及び二枚貝類中のダイオキシン類の異性体組成について

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Polychlorinated dibenzo-p-dioxinslfurans (PCDDs/DFs) and dioxin like PCBs (coplanarPCBs ; IUPAC NO. #81, #77, #126 and #169) were determined in waterfowls (common cormorants and tufted ducks), and their preys (fishes and shijimi clams) from Lake Shinji food web. PCDDs/DFs and coplanar PCBs were detected in all the biological samples. The mean concentrations on dry weight basis of total PCDDs/DFs determined from the various species were 21 pg/g for goby, 36pg/g (range ; 15-72pg/g) for sea bass, 53 pg/g (40-66 pglg) for gizzard shad, 59 pg/g for large-eyed herring, 76 pg/g (24-147 pg/g) for common cormorant, 144 pg/g (83-204 pglg) for tufted duck and 526 pg/g (313-767 pg/g) for shijimi clam, respectively. On the other hand, the total coplanar PCBs concentration varied between the various species from a mean low value of 56 pg/g (41-75 pg/g) in shijimi clam to a mean high value of 589 pg/g (323-1020 pg/g) in common cormorant. The proportion of coplanar PCBs-TEQ to the total TEQ (Σ PCDDs + Σ PCDFs + Σ Coplanar PCBs) concentrations in all biological samples was about 60%. The distribution profiles of PCDDs/DFs isomers in common cormorants and other biological samples from Lake Shinji were considerably different. Namely, toxic 2,3,7,8-chlorine substituted compounds in common cormorants were more predominant than those in the other samples. The sum of 1,3,6,8 and 1,3,7,9-TeCDD concentrations in tufted ducks, some fish samples and shijimi clams are greatly contributed to the total PCDDs/DFs concentrations. The occurrence of these isomers in biological samples suggests that environmental media in Lake Shinji had been affected by CNP used in the past.
横浜国立大学の論文

宍道湖における水鳥,魚類及び二枚貝類中のダイオキシン類の異性体組成について

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