本文设计、合成了一组新的不对称变色酸双偶氮胂类稀土显色剂。对新试剂进行了提纯鉴定,确定了组成及结构,研究了它们与稀土、钍、锆的显色反应性能。实验证明,试剂分子结构对其反应性能的影响有一定的规律性。其中o-As-DBN试剂是较优良的钍显色剂,毫克级的稀土、铀不干扰测定。 In this paper, we designed and synthesized a new group of asymmetric chromotropic acid arsine azo dyes. The new reagent was purified and identified, the composition and structure were determined, and their color reactivity with rare earth, thorium and zirconium was studied. Experiments show that the molecular structure of the reagent has a certain regularity on its reaction performance. Which o-As-DBN reagent is a better thorium developer, milligrams of rare earth, uranium does not interfere with the determination.