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研究了DCF-CPA与稀土元素显色反应的条件。实验表明,DCF-CPA的最大吸收峰位于543nm处,试剂在高酸度下可与稀土元素形成稳定的蓝色络合物(λ_(max)=640～647nm,ε=0.50～1.21×10~5)。大多数常见金属元素的共存允许量可达毫克级以上。可用于铅、锡合金中稀土总量的直接测定。在2mol·l~(-1)盐酸体系中测定了铝合金中的稀土总量,结果令人满意。
The conditions for the color reaction of DCF-CPA with rare earth elements were studied. The experimental results show that the maximum absorption peak of DCF-CPA is located at 543nm. The reagent can form a stable blue complex with rare earth elements (λ max = 640 ~ 647nm, ε = 0.50 ~ 1.21 × 10 ~ 5 ). The coexistence of most common metal elements allows up to milligrams. Can be used for direct determination of the total rare earths in lead and tin alloys. The content of rare earth in aluminum alloy was measured in 2 mol·L ~ (-1) hydrochloric acid system and the result was satisfactory.