Abstract

A simulation of the initial stages of nuclear-fuel reprocessing has been made by adding potassium iodide to hot nitric acid and sparging with a stream of air. The concentration and nature of the iodine- containing species remaining in the acid have been investigated by use of an iodide selective electrode, a radioactive iodine-125 tracer in conjunction with paper chromatography and column chromatography, differential pulsed polarography and visible region spectroscopy. The residual iodine in the nitric acid was identified as molecular iodine and iodate. The iodine which was volatilised from the nitric acid by the sparging process was adsorbed onto silver- impregnated silica. Iodine-129 Mössbauer spectroscopy showed that some of the adsorbed iodine underwent conversion to silver iodide and iodine when subjected to moderate thermal treatment.

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