Abstract
2 : 4-Di- chlorophenoxyacetic acid can be used as a reagent for the determination and extraction of thorium present in industrial wastes like worn-out gas mantles and tungsten filaments. At a pH of 2.8 to 3 thorium gives a voluminous precipitate with 2 : 4-D, which filters, washes, and ignites readily. The voluminous nature of the precipitate is advantageous in the detection and determination of the very small quantity of thorium present in the filaments. The % recovery of thorium from gas mantles and tungsten filaments is 89.5 and 0.8 respectively. The process can only be utilised for the extraction of thorium from the filaments if a huge quantity of such materials can be procured at a time.
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