Determination of technetium-99 in environmental samples by solvent extraction at controlled valence
Determination of technetium-99 in environmental samples by solvent extraction at controlled valence
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DOI：
10.1007/bf02046621
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发表时间：
1989-05
影响因子：
1.6
通讯作者：
Q. Chen;A. Aarkrog;H. Dahlgaard;Sven Poul Nielsen;Elis Holm;H. Dick;K. Mandrup
中科院分区：
文献类型：
--
作者：
Q. Chen;A. Aarkrog;H. Dahlgaard;Sven Poul Nielsen;Elis Holm;H. Dick;K. Mandrup
测定了锝和钌在四氯化碳、环己酮和5%三异辛胺（TIOA）/二甲苯中的分配系数。本文研究了用H_2O_2和NaClO控制~（99）Tc和~（99）Ru价态的溶剂萃取法测定环境样品中~（99）Tc的方法。锝和钌被NaClO氧化成TcO 4 −和RuO 4 −，用CCl 4在pH 4下萃取分离。RuO 4 −被还原为低价态，而锝被H2 O2保持在TcO 4 −态。随后通过用环己酮和5% TIOA/二甲苯进行溶剂萃取来分离锝、钌和其他核素。对~（103）Ru和~（110）mAg的去污率分别为1.35·105和1.66·105。锝-99的化学产率为55%。
Distribution coefficients of technetium and ruthenium are determined under different conditions with CCl4, cyclohexanone, and 5% tri-isooctylamine (TIOA)/xylene. A method for analyzing99Tc in environmental samples has been developed by solvent extraction in which the valences of technetium and ruthenium are controlled with H2O2and NaClO. Technetium and ruthenium which are oxidized to TcO4−and RuO4−by NaClO are separated by extraction with CCl4at pH 4. The RuO4−is reduced to low valence and technetium is kept in the TcO4−state with H2O2. Technetium, ruthenium, and other nuclides are subsequently separated by solvent extraction with cyclohexanone and 5% TIOA/xylene. The decontamination of the procedure is 1.35·105for103Ru and 1.66·105for110mAg. The chemical yield of technetium-99 is 55%.