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在过量硝酸盐存在下,稀土能与硝酸根形成配阴离子RE(NO_3)_n~(3-n)(n=4～6),用偶氮肿Ⅲ显色后,可被强碱性阴离子交换树脂吸附。吸附有配合物的树脂相即可用于稀土测定。λ_(max)=663nm,ε=0.97×10~5～1.5×10~5。变异系数4.50％。
In the presence of excess nitrate, the rare earth can form anions with RE (NO_3) _n ~ (3-n) (n = 4 ~ 6) with nitrate, which can be strongly basic anion exchanged Resin adsorption. The resin phase adsorbed with the complex can be used for rare earth determination. λ max = 663 nm and ε = 0.97 × 10 -5 to 1.5 × 10 -5. Coefficient of variation 4.50%.