海産生物のストロンチウムの蓄積-I : 海産生物中のストロンチウム・カルシウム含量,濃縮係数および観察比

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The amount of Sr and Ca in various marine organisms were determined by atomic absorption spectrophotometry and the concentration factor (CF; Srorganism/Sraea water) and observed ratio [OR; (Sr/Ca)organism/(Sr/Ca)sea water] were calculated. The average content of Sr was highest in molluscan shell (1155mg/kg raw) and decreased in crustacean exoskeleton, echinoderm, fish bone (teleostei), brown algae and coelenterata in this order. The Ca content was also highest in molluscan shell (249g/kg raw) among the marine organisms studied. The CF value of Sr ranged from 0.3 for Porphyra tenera (red algae) to 325 for Chthamalus challengers (crustacea). The CF value of brown algae was found to be one order of magnitude higher than those of green and red algae, and was rather similar to those of hard tissues of marine animals. The OR value ranged from 0.17 for shell of bivalvia (mollusca) to 0.82 for exoskeleton of stomatopoda (crustacea). However, the OR value of brown algae was extremely high (3.74) because of the affinity of Sr to alginic acid which was abundant in brown algae. From the results above, the estimation of 90Sr contamination in the marine ecosystem was considered.
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