合成了新的稀土显色剂对三氟甲基偶氮氯膦。研究了用此显色刑测定铝合金中稀土总量的分光光度法。在酸性介质中与稀土元素成正序反应。轻稀土λ_(max)=668nm,ε=0.96～1.02×10~5·L·mol~(-1)·cm~(-1);重稀土λ_(max)=659nm,ε=1.03～1.29×10~5L·mol~(-1)·cm~(-1)。 Synthesis of a new rare earth color reagent on trifluoromethyl chlorophosphonazo. The spectrophotometric method for the determination of the total rare earth content in aluminum alloy by using this colorimetric method was studied. Reacts positively with rare earth elements in acidic media. Light rare earth λ max = 668 nm, ε = 0.96-1.02 × 10 -5 L · mol -1 cm -1; λ max = 659 nm, ε = 1.03-1.29 × 10 ~ 5L · mol ~ (-1) · cm ~ (-1).