Abstract
The selective cation exchange separation of thorium on AG 50W-X12 resin is combined with a sensitive EDTA titration method using Xylenol Orange as indicator to determine thorium in low-grade ores. The end point is sharp when a back-titration with thorium solution is used. Small amounts of fluoride influence both the sharpness of the end point and the titration volume. Procedures for the determination of thorium in carbonatites and in complex tantaloniobates are described. Interference from traces of ferric iron which blocks the indicator can be suppressed by reduction to the ferrous state with hydroxylamine hydrochloride.
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