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Abstract

In irradiation experiments the precise determination of the chief constituents is necessary. Existing methods for the determination of neptunium are based on the potentiometric titration of the Np(IV)/Np(VI) couple or on the coulometric determination with constant potential using the Np(III)/Np(IV) couple. In the present work the Np was oxidized to Np(VI) with AgO, the excess of AgO was destroyed by heating or by addition of sulphamic acid. After cooling the Np(VI) was reduced to Np(VI) by an excess of Fe(II), which was backtitrated with Ce(IV). The precision was better than 0.2 %. It could be achieved using a piston pipette device connected to an automatic titrator. The accuracy was checked against NpO-2, which was examined for trace impurities by spectrometric methods and was brought to an O/M ratio of 2.000. All possible influencing parameters (factor determination, acid concentration, temperature, waiting time etc.) were examined. The results are presented in tables.

Additional information

Authors: CROMBOOM O, JRC KARLSRUHE ESTAB. (GERMANY);KUTTER H JRC KARLSRUHE ESTAB. (GERMANY), JRC KARLSRUHE ESTAB. (GERMANY)
Bibliographic Reference: KARLSRUHE INTERNATIONAL CONFERENCE ON ANALYTICAL CHEMISTRY IN NUCLEAR TECHNOLOGY, KERNFORSCHUNGSZENTRUM KARLSRUHE (GERMANY), JUNE 3-6, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32130 ORA
Availability: Can be ordered online
Record Number: 1989124014900 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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