東京湾産水産生物のPCB

Abstract

The PCB contents of 30 species of marine animals in Tokyo Bay were determined. Four species of fish caught around Hateruma Island, Okinawa, were also analysed for comparison with those in Tokyo Bay. The results are as follows: 1. Several extraction methods were tested using the tissues of dragonet and short-necked clam. Nearly the same values were obtained by all except the direct-alkali-digestion method which gave values 1.5 times higher than the others. 2. PCB values of fish meats from Okinawa were found to be between 0.02-0.1ppm. 3. In the samples from Tokyo Bay, the maximum value was 2ppm in puffer and the minimum, 0.01ppm in bloody clam, Tsunoakeusu and sea squirt. All these results suggested that the accumulation of PCB might be caused by a food chain. 4. The highest PCB value based on fat content was 603ppm in the meat of spotted shark. 5. The PCB values of viscera were always higher than those of meat, on a whole as well as a fat basis. However, on a fat basis, the differences between viscera and meat values were somewhat smaller. 6. The gas chromatographic patterns of PCB in the samples differed not only between fish species but also between the viscera and meat of the same fish.