两性离子交换纤维柱富集-电感耦合等离子体原子发射光谱法测定水样中稀土元素

ICP-AES Determination of Rare Earth Elements in Water Sample After Separation and Enrichment by Amphiprotic Ion Exchange Fiber Column

提出了两性离子交换纤维柱吸附富集镧、钕、铕、钆、铒和镱,1.5mol·L^(-1)硝酸溶液作洗脱剂,电感耦合等离子体原子发射光谱法测定水样中上述痕量稀土元素含量的方法。在优化的试验条件下,两性离子交换纤维柱对镧、钕、铕、钆、铒和镱的吸附容量分别为7.32,7.61,8.04,7.95,9.12,8.49 mg·g^(-1);镧、钕、铕、钆、铒和镱的检出限(3S/N)分别为0.032,0.068,0.033,0.053,0.045,0.019μg(-1)。方法用于水样中镧、钕、铕、钆、铒和镱含量的测定,回收率在90.0%～101.0%之间,相对标准偏差(n=5)在1.7%～5.4%之间。

Trace amounts of rare earth （RE） elements, including La, Nd, Eu, Gd, Er and Yb in water sample were adsorbed and enriched by amphiprotie ion exchange fiber column, and desorbed from the column by eluting with 1.5 mol ·L^-1 HNO3. The solution obtained was used for ICP-AES determination of the RE elements mentioned above. Under the optimum conditions, the adsorption capacity of the amphiprotic ion exchange fiber column toward La, Nd, Eu, Gd, Er and Yb were found to be 7. 32, 7. 61, 8. 04, 7. 95, 9. 12 and 8.49 mg· g^-1 respectively. Values of detection limits （3S/N） of this method were 0. 032 , 0. 068, 0. 033, 0. 053, 0. 045 and 0. 019 μg· L^-1 respectively. The proposed method was applied to the determination of trace amounts of the RE＇s in water samples, giving the values of recovery in the range of 90. 0 %- 101% and RSD＇s （n= 5） ranged from 1.7 % to 5.4%.