Savariar C P, Joseph J
Department of Chemistry, University of Calicut, Kerala, India.
Talanta. 1970 Jan;17(1):45-50. doi: 10.1016/0039-9140(70)80048-0.
N-Acetylsalicyloyl-N-phenylhydroxylamme is proposed for the separation of niobium(V) and tantalum(V) and their gravimetric determination. Niobium is precipitated at pH 5.5-6.5 by the reagent and the complex is weighed directly. Tantalum is precipitated from 1-2M hydrochloric acid solutions and the complex is ignited to tantalum pentoxide. The method is fairly selective. In the presence of thiocyanate the reagent forms an extractable complex with niobium. The reaction forms the basis of a selective and sensitive spectrophotometric determination of niobium.
N-乙酰水杨酰-N-苯基羟胺被提议用于铌（Ⅴ）和钽（Ⅴ）的分离及其重量法测定。在pH 5.5 - 6.5时，试剂使铌沉淀，该络合物可直接称重。钽从1 - 2M盐酸溶液中沉淀出来，其络合物被灼烧为五氧化二钽。该方法具有相当高的选择性。在硫氰酸盐存在下，试剂与铌形成可萃取的络合物。该反应构成了铌的选择性和灵敏分光光度测定法的基础。
