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偶氮胂Ⅲ由于1959年合成。该试剂能与不少元素形成稳定的有色内络合物,在强酸介质中与钍、锆、铪及铀(Ⅳ);在弱酸性介质中与铀(Ⅵ)、铋及稀土等元素形成有色络合物,现已应用于钍、铀、镤、钚、镎、钛、锆、铪、铌、钽和稀土元素的光度测定。由于在一般测定稀土元素的条件下,许多元素也能与试剂产生有色反应,对稀土元素测定的选择性并非十分理想。因此,有干扰离子共存时,往往需经分离手续。本文研究了偶氮胂Ⅲ光度测定稀土元素的掩蔽效应,提出了在混合掩蔽剂存在下,不经分离,直接测定
Arsenazo Ⅲ since 1959 synthesis. The reagent can form a stable colored complex with many elements, with thorium, zirconium, hafnium and uranium (Ⅳ) in a strong acid medium, and forms colored with uranium (Ⅵ), bismuth and rare earth elements in weakly acidic medium Complexes have been used in the photometric determination of thorium, uranium, gallium, plutonium, titanium, zirconium, hafnium, niobium, tantalum and rare earth elements. Due to the general determination of rare earth elements, many of the elements also react with the reagents, the selectivity of rare earth elements is not very good. Therefore, interference ions coexist, often subject to separation procedures. In this paper, the arsenazo Ⅲ photometric determination of rare earth elements masking effect, proposed in the presence of mixed masking agent, without separation, direct determination