化学溶出実験法による海水魚中のリチウムの存在状態解析

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Lithium was contained rich in ocean sardine and anchovy; especially concentrated in the back-bone, head or gill of the fish, which were related with calcium as matrix components. In leaching experiments lithium was softly dissolved from the fish bone by shaking with a 0.1mol/l hydrochloric acid or a 0.1mol/l acetic acid solution after washing and removing the surface sea-water on the fish with water. The lithium leached in the acid solutions and remained to the residue was determined by flame photometry using the atomic absorption spectrophotometer with air-acetylene flame, after the decomposition with nitric-perchloric acid mixture. In the gill, head and back-bone of anchovy, 73, 71 and 71% of total lithium were dissolved with 0.1mol/l hydrochloric acid, respectively. Same leaching results were obtained for calcium; 78〜84% of total calcium were also dissolved with the same leaching solution. The ratio of lithium and calcium dissolved in hydrochloric acid or acetic acid were almost constant to be 3〜8×10^<-5> regardless of the sort of acid, the number of leaching fraction and the part of fish bone, and the ratio in the hydrochloric acid leaching was constant to be 7±2×10^<-5>. Those values was nearly equal to the ratio of 6±2×10^<-5> (n=9) of total lithium content of anchovy. It was, therefore, supposed that lithium was existed in fish bone as calcium compounds which was likely apatite or calcite, or a part of total lithium presented as the complexing component with calcium, which was passed through the dialysis filter less than 10000 as molecular weight.
甲南大学の論文
2005-12-25

化学溶出実験法による海水魚中のリチウムの存在状態解析

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