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利用溶剂萃取,使铀同干扰离子分离,可提高测定铀的选择性。但是往往稀土、钍、钙、钒、铌、钽、锆、铪及钛等仍有严重干扰。T(?)Yamamoto等报导了用三正辛胺-苯-乙醇-盐酸体系萃取铀(Ⅵ),以偶氮氯膦Ⅲ(CPAⅢ)作显示剂测定海水中微量铀。我们在此基础上研究了国产N235(叔胺类萃取剂)-苯-盐酸体系中铀的萃取。发现在4N以上盐酸介质中能定量萃取铀,在4.5～6.5N盐酸介质中,能使铀有效地同稀土、钍、锆、铌、钽及钛等离子分离。然后在氯化型N235-苯-乙醇-盐酸体系中,加入CPAⅢ形成蓝绿色的铀(Ⅵ)-CPAⅢ-N235
The use of solvent extraction, uranium interference with the ion separation can improve the determination of uranium selectivity. However, rare earth, thorium, calcium, vanadium, niobium, tantalum, zirconium, hafnium and titanium are still often seriously disturbed. T (?) Yamamoto et al. Reported the extraction of uranium (Ⅵ) with trioctylamine-benzene-ethanol-hydrochloric acid system and the determination of trace uranium in seawater with chlorophosphonazo Ⅲ (CPAⅢ) as a display reagent. On this basis, we studied the extraction of uranium from the domestic N235 (tertiary amine extractant) -benzene-hydrochloric acid system. It was found that uranium can be extracted quantitatively from 4N hydrochloric acid medium and can be effectively separated from rare earth, thorium, zirconium, niobium, tantalum and titanium in 4.5 ~ 6.5N hydrochloric acid medium. Then chlorination of N235-benzene - ethanol - hydrochloric acid system, adding CPA Ⅲ to form a blue-green uranium (Ⅵ) -CPA Ⅲ-N235