The Role of Temperature on Radio Iodine Adsorption Behavior in the Sandy-loam Soil

The sorption capability of the Sandy-Loamy soil for radio nuclides can be improved substantially by physical factors. Therefore, the present study was conducted to determine the effect of different temperatures on adsorption and desorption of radio iodine in the sandy-loamy soil. To the end, cultivated and non-cultivated soil samples were collected from Pardis (student’s dormitory) and Kalate razagh zadeh, in Zahedan, Iran. Furthermore, the samples were tested in batch experiments with radio iodide. Prior to the actual experiment phase, the samples were pre-treated under low and high temperature with 20 cc radio iodine 125. The results indicated that, an increase in temperature has a remarkable effect on iodide adsorption. In other words, in batch experiments with equilibrium temperatures of -10, -8, 0, 5, 60 and 70°C, iodide adsorption increases with increasing temperature. However, higher temperatures raise radio iodide adsorption only to a certain extent, but this is more pronounced for cultivated soils. In conclusion, the role of temperature was found to be the same as effects of organic matter in the soil.