沿岸魚介類の総水銀,アルキル水銀およびメチル水銀含量について

概要

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This investigation was conducted in an attempt to clarify the levels of total, alkyl, and methyl mercuries in the fish and shells caught in coastal waters where mercurial pollution was not assumable. The development of analytical procedures proposed by the present authors for mercury determination made it possible to conduct an extensive survey of the mercury distribution in the fish and shells, totaling 133 samples, available at Yamaguchi and adjacent waters. The results obtained are as follows: 1) The results of the analysis for total mercury were that mean values of 0.069, 0.078, 0.058, and 0.041ppm were obtained in the edible portions of fish, crustacean, cephalopod, and bivalve and gastropod groups respectively, with wide within-group variation. 2) No lower alkyl mercuries, except methyl mercury, were detected in any of the samples. It is conceivable, therefore, that the content of lower alkyl mercury coincides with that of methyl mercury when the sample is obtained from the coastal waters probably uncontaminated with mercury. Mean values of methyl mercury in the edible portion of the four abovementioned groups were 0.046, 0.009, 0.025, and 0.008ppm respectively. 3) The mean ratios of methyl mercury to total mercury in the edible portion of the four groups were 0.67, 0.46, 0.70, and 0.18 respectively.
公益社団法人日本水産学会の論文