有明海の底土,魚貝類およびアサクサノリのカドミウム含量およびそれらの分布について

概要

論文の詳細を見る
Ariake Bay has been polluted by cadmium from the wastes of zinc metallurgical plants of Ohmuta city. Analyses of cadmium content revealed that contamination of bottom mud was developing anticlockwise from the river mouth of Ohmuta to almost all waters in this bay. The cadmium content in the dry mud ranged from 0.4 to 15ppm. Based on an upper safety limit of 0.3mg/day/person of cadmium, it was calculated that the intake of shucked blood clams should be restricted to 90-300 g/day/person. On the other hand, no cadmium was detected substantially in fish flesh and was therefore considered harmless. The content of cadmium in Porphyra tenera ranged from 0.3 to 4 ppm dry matter. This suggests no cause for concern, because the quantity of this alga taken as food in a day is not sufficient to result in a large intake of cadmium.