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稀土元素与DBC[2-(2-肺酸基苯偶氮)-7-(2,6-二溴-4-氯苯偶氮)-1,8-二羟基-3,6-二磺酸萘,简称DBC或DBC偶氮胂]反应速率常数随着原子序数的增大而减小,所以Pr、Er之间速率常数差别大。在0.24mol/L HCl介质中Pr与DBC一混合反应即达到平衡,而铒与该试剂反应的半衰期为36秒。利用此反应,本文提出用线性外推法同时测定Pr、Er混合物中的单一稀土,推导了测量方程,用线性外推法测量了5个Pr、Er混合物试样,方法准确度约为5％。此方法简便,并不需要进行复杂的计算。
Rare Earth Elements and DBC [2- (2-hydroxyphenylazo) -7- (2,6-dibromo-4-chlorophenylazo) -1,8-dihydroxy-3,6-disulfonic acid Naphthalene, referred to as DBC or DBC arsenazo] reaction rate constant decreases with increasing atomic number, so Pr, Er between the rate constant difference. In 0.24mol / L HCl medium Pr and DBC a mixed reaction to achieve equilibrium, and erbium and the reagent half-life of 36 seconds. Using this reaction, we proposed a linear extrapolation method for the simultaneous determination of single rare earths in Pr and Er mixtures. The measurement equation was deduced. Five Pr and Er mixtures were measured by linear extrapolation. The accuracy of the method was about 5% . This method is simple and does not require complex calculations.