誘導結合プラズマ質量分析法による海洋生物中の｀２３８´Ｕの定量

Abstract

Determination of 238U in fifty-five species of marine organisms was carried out by inductive-ly coupled plasma mass spectrometry which showed some advantages such as high sensitivity, wide dynamic range and small interferences from matrices for the analysis of high mass elements. The concentrations of 238U in soft tissues of marine animals ranged from 0.076 to 5000ng/g wet wt. Especially, the branchial heart of cephalopod molluscs showed the specific accumulation of 238U. The concentration factor of the branchial heart of Octopus vulgaris, which indicated the highest value, was calculated to be about 103 by comparing it with the concentration of 238U (3.2±0.2ng/ml) in coastal seawaters of Japan. The concentrations of 238U in hard tissues of marine invertebrates were similar to those in soft tissues. In contrast, hard tissues like bone, scale, fin, etc. of fishes showed much higher concentrations of 238U than soft tissues like muscle and liver. The concentrations of 238U of twenty species of algae ranged from 10 to 3700ng/g dry wt.