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当有铀和钍存在的情况下,用氯化锌或硫酸锌以络黑T进行反滴定对稀土元素不可能进行测定。我们所推荐的方法是基于pH～10时按紫尿酸铵(MEPEKCИД)用氯化镍溶液滴定剩余的特里龙Б的这一原理。此法适用于测定钍以及钍和稀土元素的总量,用其它方法测定钍后即可计算出稀土元素的含量,从一个样品的溶液中同样能分别测定稀土元素和钍。络合法滴定时,铵盐可使紫脲酸铵指示剂颜色转变不好;在滴定溶液中铵盐的允许含量不超过300毫克。在酸性介质中,用络合法测定钍时,阴离子有干扰,用该方法时,在溶液中阴离子
In the presence of uranium and thorium, it is impossible to measure rare earth elements with zinc titanate or zinc sulphate with deoxyretintrometry. Our recommended method is based on the principle that titration of the remaining terriborobes by ammonium chloride solution (MEPEKCИД) with nickel chloride solution at pH ~ 10. This method is suitable for the determination of total thorium and thorium and rare earth elements, and other methods for the determination of thorium after the content of rare earth elements can be calculated from a sample of the same solution can be measured rare earth elements and thorium. Complexometric titration, ammonium salt can make ammonium thiocyanate indicator color transition is not good; in the titration solution ammonium salt does not exceed the allowable content of 300 mg. In acidic media, the complexation method for the determination of thorium, the anion interference, with this method, the solution of anions