比例方程法测定重稀土二元混合物

比例方程法是速差动力学分析中常用的方法,Яцимирский和Степаиов^1,2]曾用此法测定稀土混合物。此法的缺点是需要准确控制时间,手工操作时误差较大。

The Determination of Binary Heavy Rare Earth Mixture by Proportional Equation Method

When a binary mixture was determined with the proportional equation method according to the difference of reaction rates, the two equations could be set up by selecting two special times. t=0 and t→∞, if the reaction is reversible. Because of the initial concentration and the equilibrium concentration are independent of the reaction rate, the strict control of time in the experiment is unnecessary and a good result could be obtained. Based on this principle, the possibility of determining the binary heavy rare earth mixture by means of the ligand exchange reaction between RE arsenazo Ⅲ and CyDTA is discussed. Experimental results show that the relative error is less than 5% when the mixture of Dy and Er is in the range of 1 : 5～5 : 1 at 10～100 μg/25 mL level.