Abstract The suitability of perrhenate (Re(VII)) to act as an analog for pertechnetate (Tc(VII)) was tested using solvent extraction and the carrier/tracer systems 99Tc(VII)/99mTc(VII) and 185/187Re/186/188Re(VII). Perrhenate is often used as a non-radioactive analogue of pertechnetate, but scarce data is available for the comparison of these metals for liquid-liquid extraction applications. Results show that neither Tc(VII) nor Re(VII) extraction is influenced by pH in the 2–8 range. The anion extractant also separates electrolyte anions, with increasing extraction following the order Cl− < NO3− ≪ ClO4−, resulting in a decreased Tc(VII) and Re(VII) extraction in presence of salt. In particular, the extraction of Re and Tc is suppressed in presence of NaCl at concentrations higher than 1 mM. While Tc extraction is larger than that of Re in absence of electrolyte, they are statistically identical in presence of enough electrolyte. Furthermore, tetraphenylphosphonium chloride (Ph4PCl) is a stronger extractant than iodonitrotetrazolium chloride (INT).

中文翻译：

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溶剂萃取系统中 ReO4− 和 TcO4− 的比较

摘要 使用溶剂萃取和载体/示踪剂系统 99Tc(VII)/99mTc(VII) 和 185/187Re/186 测试了高铼酸盐 (Re(VII)) 作为高锝酸盐 (Tc(VII)) 类似物的适用性/188Re(VII)。高铼酸盐通常用作高锝酸盐的非放射性类似物，但可用于比较这些金属在液-液萃取应用中的数据很少。结果表明，Tc(VII) 和 Re(VII) 萃取均不受 2-8 范围内 pH 值的影响。阴离子萃取剂还分离电解质阴离子，按照 Cl− < NO3− ≪ ClO4− 的顺序增加萃取，导致在盐存在下 Tc(VII) 和 Re(VII) 萃取降低。特别是，当 NaCl 浓度高于 1 mM 时，Re 和 Tc 的提取受到抑制。虽然在没有电解质的情况下 Tc 提取比 Re 大，但在有足够电解质的情况下，它们在统计上是相同的。此外，四苯基氯化鏻 (Ph4PCl) 是比碘硝基四唑氯化物 (INT) 更强的萃取剂。