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混合稀土中钦、铒、铥的测定,长期以来一直采用其盐类(氯化物、硝酸盐等等)溶液本身对光的吸收来进行比色分析。这个方法虽然操作简便,一般不须作烦琐的稀土元素分离工作,但灵敏度不高,仅适用于测定常量和高含量的单一稀土元素(一般含量约在10％以上),不适于低含量稀土元素的测定。为此,我们对最近报导的在水-丙酮溶液中应用二苯酰甲烷测定钬、铒、铥的方法进行了试验。实践证明本方法具有灵敏度高,选择性好,溶液颜色稳定的优点。用于混合稀土中钬、铒、铥的测定,获得较满意的结果。本法灵敏度为:每毫升Ho_2O_3 1.29、Er_2 O_3 3.68、Tm_2O_3 20.9微克。
Determination of mixed rare earth Qin, erbium, gallium, has long been its salt (chloride, nitrate, etc.) solution itself for light absorption colorimetric analysis. Although this method is simple and convenient, it generally does not need to be a trivial rare earth element separation work, but its sensitivity is not high. It is only suitable for the determination of a single rare earth element with a constant content and a high content (generally about 10% or above) and is not suitable for low content rare earth elements The determination. For this reason, we tested the recently reported method for the determination of holmium, erbium, and 二 using dibenzoylmethane in a water-acetone solution. Practice has proved that the method has the advantages of high sensitivity, good selectivity, solution color stability. Used for mixing rare earth holmium, erbium, 铥 determination, to obtain more satisfactory results. The sensitivity of the method is as follows: Ho 2 O 3 1.29 per ml, 3.68 Er 2 O 3, and 20.9 μg Tm 2 O 3.