海水中のクロム-51の捕集
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概要
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Since a greater part of <SUP>51</SUP>Cr discharged into the sea is considered to be present mainly in the valence state of VI, it was reduced to Cr(III) by iron(II) and collected by the ferric hydroxide coprecipitation method. The carrier of chromium (0.09 mg) was added to 50 m<I>l</I> of sea-water containing tracer <SUP>51</SUP>Cr and the pH of the mixture was brought to 1.8 by the addition of hydrochloric acid. A solution of iron(II) sulfate (0.6 mg Fe) was added to reduced Cr(VI) and then the mixture was adjusted its pH at 8 to precipitate hydroxides with sodium hydroxide after the addition of 2.25 mg of iron(III) as a collector. <SUP>51</SUP>Cr was collected rapidly and quantitatively as hydroxide. The procedure has been also proved to be satisfactory in a larger scale operation (80 fold). Several other radioisotopes such as <SUP>54</SUP>Mn, <SUP>59</SUP>Fe, <SUP>60</SUP>Co and <SUP>65</SUP>Zn were also coprecipitated quantitatively and it was found to be advantageous in the separation of chromium from the hydroxides precipitates that the reducing agent and the collecting agent are the same, material, iron.
- 社団法人 日本分析化学会の論文
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