Reversed phase extraction chromatographic separation of thorium with Amberlite LA-1 from malonate solutions

Thorium was extracted at pH 5.0 from 0.01M malonic acid on a column of silica gel coated with Amberlite LA-1. Thorium was separated from alkali and alkaline earths, manganese, iron, cobalt, nickel, zinc, tin, in binary mixtures by taking advantage of the pH differences in the formation of malonato complexes. Thorium was separated from zirconium, uranium, scandium, molybdenum, titanium by exploiting the differences in the stability of malonato complexes. The method was extended to the analysis of thorium in monazite. (author)