痕量锕系元素的精密测定  Ⅲ、荧光络合滴定法测定Pu(SO_4)_2·4H_2O中钚的含量

PRECISE DETERMINATION OF TRACE ACTINIDES III.FLUORESCENCE COMPLEXOMETRIC TITRATION OF Pu IN Pu(SO_4 )·4H_2O

摘要: 本文叙述将痕量锕系元素的非常规络合滴定法用于痕量钚的精密测定。先将钚在pH～2—3的甲醛及过量DTPA标准溶液存在下,用Na_2S_2O_4还原为Pu~(4+),然后用Tiron作指示剂,用Tb~(3+)标准溶液作荧光络合滴定。钚的取样量为30—40μg时,准确度及精密度(RSD)均在0.1％以内。

Abstract: The procedure of unusual fluorescence complexometric titration is applied to the determination of Pu in Pu(SO4)·4H2O. Both accuracy and precision for the determination of 30-40 μg Pu are within 0.1%.