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ヘキサシアノ鉄(II)酸ニッケル-水酸化鉄(III)共沈法を用いた海水中$$gamma$$線放出核種分析法

Analytical method of $$gamma$$ emitters in seawater using coprecipitation with nickel hexacyanoferrate(II) and iron(III) hydroxide

中野 政尚; 國分 祐司; 佐々木 剛志*; 武石 稔

Nakano, Masanao; Kokubun, Yuji; Sasaki, Takeshi*; Takeishi, Minoru

放射性同位元素($$^{137}$$Cs)及び安定元素を用いて、ヘキサシアノ鉄(II)酸ニッケル-水酸化鉄(III)共沈法による海水中$$gamma$$線核種分析方法の回収率確認実験を行った。添加した$$^{137}$$Csの99%をヘキサシアノ鉄(II)酸ニッケル沈殿に、Ce, Co, Mn, Ru, Zn, Zrの88$$sim$$94%を水酸化鉄(III)沈殿に回収できた。同法は、操作が短時間かつ簡単で、同時に複数件の分析も容易であること等、環境放射線モニタリングにおいて、非常に効率的で実用的な分析方法である。

The analytical yield of $$gamma$$ emitters in seawater by coprecipitation method with nickel hexacyanoferrate(II) and iron(III) hydroxide was confirmed using spiked radioisotope ($$^{137}$$Cs) and stable elements. Ninety-nine % of spiked $$^{137}$$Cs was adsorbed on nickel hexacyanoferrate(II), and 88 $$sim$$ 94% of spiked Ce, Co, Mn, Ru, Zn, Zr was adsorbed on iron(III) hydroxide. This analytical method is considered tobe very efficient and practical for environmental radiation monitoring from the view of quick and simple operation, especially easy analysis of plural samples.

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