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高纯氧化钇中痕量稀土杂质的测定,多采用发射光谱分析法,直接测定灵敏度不够,必须先将痕量稀土杂质富集分离。阳离子交换色层法是较常用的富集分离方法。曾采用醋酸铵、HEDTA 作淋洗剂,从基体中富集分离出重稀土杂质。由于醋酸铵的分离因数小。HEDTA 分离因数虽较大,但由于氨基多羧酸类络合剂与稀土的络合、离解及交换反应速度慢,使淋洗峰宽。故富集杂质50—100倍,均需40多小时。
Determination of trace rare earth impurities in high-purity yttrium oxide, more use of emission spectroscopy, the direct determination of sensitivity is not enough, you must first trace of rare earth impurities enrichment separation. Cation exchange chromatography is the most commonly used enrichment and separation method. Had used ammonium acetate, HEDTA as eluent, from the matrix enrichment separation of heavy rare earth impurities. Due to the small ammonium acetate separation factor. HEDTA separation factor is large, but due to amino polycarboxylic acid complexing agent complexation with rare earth, dissociation and exchange reaction slow, so that the rinse peak width. It is 50-100 times more enriched impurities, both more than 40 hours.