PMBP─苯萃取光度法测定磷肥中稀土总量

Spectrophotometric Determination of Total Rare Earth in Phosphate Fertilizer

用ＰＭＢＰ──苯萃取、甲酸反萃取分离稀土，在ＫＣｌ介质中用偶氮肿Ⅲ显色剂光度法测定了三种磷肥样品中的稀土总量。对每种样品１１次测定统计结果为标准偏差＜０．０１６，变动系数＜８％。

It has been reported that the total rare earth in phosphate fertilizer,which is extracted bv PMBP-benzene and reextracted by formic acid,is determined by spectrophotometry with arsenazo Ⅲ in KCl solution.For each of three samples,the statistical results show that the standard deviation is less than 0.016and the variation coefficient is less than 8%.