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近年来,稀土元素化学分析的发展十分迅速。特别是一系列不对称变色酸双偶氮氯膦类衍生物的合成及其性能的研究,使之成为一类性能良好的稀土显色剂。从结构上看,这类显色剂由于具有较强的成盐基团膦酸基(—PO_3H_2),而且在偶氮基的对位上引入了一个电负性强的Cl原子,因而能在较强的酸性介质中与稀土元素反应,增强了对许多金属离子的抗干扰能力。另外还有选择性好、灵敏度高、测定简便等优点。许多单位应用这类显色剂并取得了不少成果。如偶氮氯膦-mA、
In recent years, the chemical analysis of rare earth elements has developed rapidly. In particular, a series of asymmetric chromotropic acid bis-chlorophosphonates derivatives of synthetic and its performance research, making it a good performance of rare earth developer. From the structural point of view, this kind of developer has a strong salt-forming phosphonic acid group (-PO 3 H 2) and a strong electronegativity Cl atom in the para-azo group, Strong acidic medium with rare earth elements, enhanced resistance to many metal ions anti-interference ability. In addition there are good selectivity, high sensitivity, simple determination and so on. Many units use this type of developer and have achieved a lot. Such as chlorophosphonazo-mA,