通过银氧化、亚铁还原和重铬酸盐滴定法电位测定钚。

Potentiometric determination of plutonium by argentic oxidation, ferrous reduction and dichromate titration.

作者信息

Drummond J L, Grant R A

机构信息

U.K.A.E.A., Reactor Group, Dounreay Experimental Reactor Establishment, Thurso, Caithness, Scotland.

出版信息

Talanta. 1966 Mar;13(3):477-88. doi: 10.1016/0039-9140(66)80066-8.

DOI:10.1016/0039-9140(66)80066-8

PMID:18959901

Abstract

A simple and rapid method is described for the routine determination of plutonium with a coefficient of variation of better than 0.2%. It is directly applicable to nitrate solutions containing a large amount of uranium; moderate amounts of iron, molybdenum, fluoride and phosphate do not interfere. Chromium, cerium and manganese interfere quantitatively, and the procedure may also prove convenient for the determination of these elements. The plutonium is oxidised to the sexivalent state with argentic oxide in nitric acid solution, and the excess of oxidant is destroyed by reaction with sulphamic acid. A weighed small excess of iron(II) solution is then added, and the excess is titrated potentiometrically with standard potassium dichromate solution using polarised gold indicator electrodes. The whole determination is performed in one vessel at room temperature, and takes about 20 min.

摘要

描述了一种简单快速的方法用于常规测定钚，其变异系数优于0.2%。该方法可直接应用于含有大量铀的硝酸盐溶液；适量的铁、钼、氟化物和磷酸盐不产生干扰。铬、铈和锰会产生定量干扰，该方法也可能适用于这些元素的测定。在硝酸溶液中用氧化银将钚氧化至六价态，并用氨基磺酸与过量的氧化剂反应将其破坏。然后加入称量好的少量过量铁（II）溶液，并用极化金指示电极以标准重铬酸钾溶液对过量部分进行电位滴定。整个测定在一个容器中于室温下进行，耗时约20分钟。