铀、钼有机萃取剂中无机磷的分析方法研究

Study on analytical method of inorganic phosphorus in organic phase

研究和建立了铀、钼有机萃取剂中无机磷含量的分析方法。采用100 g·L^-1的Na2CO3溶液为反萃取剂反萃取有机相,反萃取相比为1:1,反萃取时间为1 min,连续萃取3次,温度为25~30℃,无机磷的反萃取率优于98.0%。采用磷钼蓝比色法测定反萃取溶液中磷的含量,该方法的相对标准偏差小于5%,加标回收率为96.3%~101.0%。该方法简单、快速,精密度、准确度良好,加标回收率符合要求,适用于铀、钼萃取有机相中无机磷含量的分析。

A method for the determination of inorganic phosphorus in organic phase has been developed.The organic phase was extracted back with a reverse extractant(100 g·L^-1 Na2CO3 solution).The ratio of each reverse extraction was 1:1,the time of the reverse extraction was 1 minute,three times in a row,and the temperature ranged from 25 to 30℃.The reverse extraction rate of phosphorus is better than 98.0%.The phosphorus content in the reverse extraction solution was determined by phosphomolybdenum blue colorimetry.The relative standard deviation of this method is less than 10%,and the recovery of standard addition is 96.3%~101.0%.