目前,已研究过氯、溴和碘取代基对偶氮氯膦类试剂显色性能的影响,而对于氟取代基的影响尚未见报道。我们新合成了对(间)氟偶氮氯膦显色剂,并研究了该试剂与稀土元素的显色反应及测定钢中稀土元素的方法。 试验采用的仪器为UV-3000型分光光度计,721型分光光度计。主要试剂为0.05％的 At present, the effects of chlorine, bromine and iodine substituents on the color development of chlorophosphonazo reagents have been studied, and the effect on fluorine substituents has not been reported. We have newly synthesized p-chlorophosphazene chlorophosphite reagent, and studied the reagent and the rare earth element color reaction and determination of rare earth elements in steel. The instruments used in the experiment were UV-3000 spectrophotometer and 721 spectrophotometer. The main reagent is 0.05%