Investigation of Iodine Stability and Uptake in Iodized Salt: Effects of Temperature, pH and Radiation

Abstract

Iodine is a trace element which needed in human being since it plays vital role for metabolism rate. The iodine will be adsorbed by thyroid gland to secrete hormone for controlling metabolism. Iodine is volatile as it readily sublimes at high temperatures. Thus, it is important to keep iodine at suitable temperature and important for the consumers to take enough iodine in our daily meals. Therefore, the objectives of this research are to verify the temperature and pH properties of iodine, to investigate the effect of radiation on iodized salt and to evaluate the suitability amount of iodine uptake by human thyroid. This research involved the titration method. The amount of thiosulfate used in the titration is proportional to the amount of iodine in the salt. The absorption peak and functional group present in salt solution is analysed using UV-Visible spectroscopy and FTIR spectroscopy. The iodized salt is radiate with Cs-137 to analyse its composition using FESEM-EDX. Concentration of iodine resulted from titration is converted into parts per million, ppm to determine the iodization level in the salt that approved by World Health Organization, WHO and the suitable amount of iodine uptake for healthy thyroid. From this study, the iodine content is low at high temperature and in acidic condition. The UV and infrared absorption in salt sample solution had shown its peak value and the functional group present in the sample. The non-irradiated and irradiated iodized salts had shown their elemental composition using FESEM with EDX. Also, the iodine concentration in iodized salt and its suitability of iodine consumption in human followed the iodization level by WHO.