A study of iodine loss during the preparation and analysis of samples using 131I tracer and neutron activation analysis

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Xiaolin Hou, Xiangqian Feng, Qinfang Qian, Chifang Chai and Xiaolin Hou


Abstract

The recoveries of various species of iodine, such as I, IO3 and organic iodine, in the procedures of acid digestion, ashing, freeze-drying, evaporation drying and neutron irradiation were studied using 131I tracer and instrumental neutron activation analysis. The recoveries of iodine were over 99% after drying at room temperature and 60–80 °C for various iodine species in all kinds of media. The organic iodine in various media, I and IO3 in biological materials and IO3 in alkaline solution were not lost after freeze-drying, whereas I in aqueous solution and IO3 in acidic and neutral solution were significantly lost. The recoveries of iodine were different under various acid digestion conditions. Under the optimum conditions, more than 96% of iodine remained in the digestion solution. With ashing, the recovery of iodine was less than 2%. Addition of alkali to the samples can significantly improve the iodine recovery, but the ashing is incomplete in this case. Only 90% of iodine was recovered using alkali ashing at 650 °C. Neutron irradiation did not cause any loss of iodine.


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