【摘要】 <正> 当共存大量非金属和金属离子（其中包括铌）时,作为钽的特效沉淀剂未见文献报道.梶山绿朗提出,用氯化四苯鉮盐酸（TPAC）在8mol·L^-1以上氢氟酸介质中定量沉淀铌钽合量.作者曾在此基础上探索了铌钽分离.研究结果表明,在0.11—0.22mol·L^-1的NH₄HF₂介质中铌钽分别以TaF₆^-1和NbOF₅^-2状态存在,TPAC只能与前者形成氟钽酸四苯鉮（（C₆H₅）₄AsTaF₆,简称TPAFTa）离子缔合物沉淀,而后者不沉淀,从而使铌钽定量分离. 本文以TPAC作为沉淀剂用重量法测定含铌复杂基体中钽的可能性.研究结果表明,TPAFTa经分解定量地转化为五氧化二钽,并以此为称量形式.对20多种共存离子的吸附或更多还原

【Abstract】 A new gravimetric method has been developed for the quantitative determination of tantalum in a complex sample containing niobium by using tetraphenylarsonium chloride hydrochloride （TPAC） as a highly selective precipitant for fluorotantalate, namely through the formation of an ionic associate, （C₆H₅）₄AsTaF₆, which is a white needle with good thermal stability. It decomposes to tantalum pentaoxide after heating to 900℃.The coexistence of 20 foreign ions examined in the original sample shows no harmful effect in the determination of tantalum. Some physicochemical properties and physical constante of （C₆H₅）₄AsTaF₆ have been studied in detail and recorded.The recovery of tantalum was 98.1-101.8% and the result of analyses of a nickel-based alloy was 1.80±0.027% Ta.更多还原