胺类萃取剂高效分离Hf(Ⅳ)与W(Ⅵ)的方法研究

Separation of Hafnium(Ⅳ) From Tungsten(Ⅵ) by Solvent Extraction Using Amines as Extractants

摘要: 针对某些环境样品中¹⁸²Hf的加速器质谱（AMS）分析，以N₁₉₂₃和TOA为萃取剂，研究了不同无机酸、酸浓度、络合剂浓度、萃取剂浓度、稀释剂类型等因素对Hf(Ⅳ)与W(Ⅵ)萃取行为的影响，建立了胺类萃取体系分离Hf(Ⅳ)与W(Ⅵ)的方法。该法对Hf(Ⅳ)的回收率大于90%，对毫克量级W(Ⅵ)的去污因子为4.4×10⁷。

Abstract: In order to measure ¹⁸²Hf in some environmental samples by accelerator mass spectrometry(AMS), a method for separation of hafnium(Ⅳ) from tungsten(Ⅵ) has been developed by solvent extraction using N₁₉₂₃ and TOA as extractants. The effects of different mineral acids, acid concentration, complexing agent concentration, extractant concentration and diluent on the extraction behavior of both elements were investigated. The recovery of hafnium(Ⅳ) is better than 90% and the decontamination factor for milligram amounts of tungsten(Ⅵ) is 4.4×10⁷ using the present separation procedure.