The Use of Isaza (<I>Chaenogobius isaza</I> TANAKA) to study the PCB Pollution
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概要
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Polychlorinated biphenyls (PCBs) had been used in industry since 1954. Around Lake Biwa, 16 factories used such materials, and they were detected in many environmental samples from the lake. In this study, the PCB concentration was determined by gas-chromatography in Isaza, in the northern part of Lake Biwa. PCB residues were found in all the samples collected from 1966 to 1976, and the concentrations ranged from 0.413 to 1.53 ppm. PCB residues in Isaza aged 1 are higher than those in Isaza aged 0, and the differences is significant. This difference is thought to be related to the difference of their fat contents. The ratio of highly chlorinated PCB to the total PCB residue in Isaza aged 1 is significantly higher than that in Isaza aged 0. The reason seems to be that low chlorinated PCBs are more easily metabolized than highly chlorinated PCBs. PCB residues in Isaza do not show much decrease even after PCB production was stopped in 1972.
- 日本陸水学会の論文
日本陸水学会 | 論文
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