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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。
This article describes the trace actinides unconventional complexometric titration method for the determination of trace plutonium. Firstly, plutonium is reduced to Pu ~ (4+) with Na2SO4 in the presence of formaldehyde and excess DTPA standard solution at pH ~ 2-3. Then Tiron is used as an indicator and Tb3 + standard solution is used for fluorescence complexation Titration. Plutonium sampling volume of 30-40μg, accuracy and precision (RSD) are less than 0.1%.