江苏平原地区(淮河流域)潜水碘含量控制因素探讨

本文通过工作区潜水碘含量的分布特点,与所处土壤、水文地质条件、地形地貌等一起进行综合分析,对地下水中碘的控制因素有了一个全新的认识:与前人认为地下水中碘的含量与有机质成正比的观点不同的是,本文认为地下水中碘的含量与有机质含量无固定关系,但有机质有助于促进水溶性碘的增加,相似水文地质条件下成正比;地下水径流条件对潜水碘含量影响重大,径流条件较好的丘陵、岗地往往较低,地势低平、径流条件较差的洼地和泛滥沉积区往往为高碘地区;相同水文地质条件下,地下水中的碘含量与土壤中的含量成正比;碘的另一重要特征是在地下水中的浓度较为稳定,随时间、开采而变化不大。

A Tentative Discussion on the Control Factors of Iodine Content in Phreatic Water in Huaihe River Plains of Jiangsu Province

Based on an analysis of the distribution of iodine content in phreatic water, soil and hydrogeological conditions and land form, the authors have a new understanding on the control factors of iodine content in groundwater: The previous researchers hold that the iodine content in groundwater is proportional to the organic matter, whereas the authors consider that there is no fixed relationship between the iodine content and organic matter content in groundwater, but the organic matter contributes to the increase of water-soluble iodine content, and they are directly proportional in some areas. Groundwater flow conditions impact significantly the iodine content. The iodine content is often low and in compliance with drinking water standards in hilly land where the runoff conditions are better, whereas the iodine content often exceeds drinking water standards in low-lying areas of poor runoff conditions; The iodine content in groundwater is directly proportional to the content in soil under the same hydrogeological conditions. Another important feature of the iodine concentration in groundwater is that it is very stable and changes very little with time and mining activity.