Abstract:This study is to develop an inductively coupled plasma mass spectrometry (ICP-MS) method for the determination of iodine in soils by hot-alkali extraction. The optimal extraction conditions were obtained by exploring the three parameters of pretreatment process-alkalinity, temperature and time. The results showed that the linear range of the established method was between 0 and 500 μg/L with the linear correlation coefficient of 0.9998, the detection limit was 0.12 μg/g, the recovery rates ranged from 91.0% to 104%, RSD were all lower than 5%. In conclusion, the method is rapid, sensitive and accurate in determining iodine in soils.