Authors:N. Singh, S. Mohan, and G. Balasubramanian
A very sensitive extraction spectrophotometric method for the analysis of uranium based on the extraction of a uranium—benzoate—crystal
violet complex by a mixture of xylene and benzene is described. The absorbance maximum is at 606 nm and molar absorptivity
is 4.28·104 l·mol−1·cm−1. The interference due to a number of anions and cations studied without any pre-extraction was found to be within permissible
limits. The method has been used for determining uranium in a synthetic solution, i.e., uranium in the presence of various
other ions. The interference due to some cations was eliminated by the use of a masking agent (boric acid).
Authors:N. Singh, T. Thankachan, and G. Balasubramanian
A very sensitive spectrophotometric method for analysis of thorium based on thoriumbenzoate-aniline blue complex is described.
The maximum absorbance is found to be at 660 nm. The molar absorptivity of the complex is 3.16− 103 1− mol−1-cm−1. The interference due to many ions was found to be within acceptable limits. This method has been used to determine the quantity
of thorium from a synthetic solution.
Authors:A. Palamalai, S. Mohan, M. Sampath, R. Srinivasan, P. Govindan, A. Chinnusamy, V. Raman, and G. Balasubramanian
Some batches of233U oxide product obtained from the reprocessing treatment of irradiated thorium rods, called J-rods in our plant, have been found to contain thorium as much as 85% and iron above 5% as impurities. This product has to be purified before sending for fabrication of the fuel. The present purification method consists of the following three steps: (1) preferential dissolution of U3O8 as compared to thoria, (2) a novel solvent extraction process, and (3) preferential precipitation of Th as oxalate leaving behind the entire U in the filtrate. Development and application of the present purification method to the above233U oxide proxduct are presented in this paper.