山西晋中地区地下水高碘的地球化学特征研究  

High iodic geochemical characteristics of the groundwater in central Shanxi Province

作　　者：徐清[1] 刘晓端[1] 汤奇峰[1] 刘久臣[1] 黄园英[1] 张玲金[1] 

机构地区：[1]国家地质实验测试中心 中国地质科学院生态地球化学重点实验室,北京100037

出　　处：《中国地质》2010年第3期809-815,共7页Geology in China

基　　金：中国地质局地质大调查项目(1212010634714)资助

摘　　要：研究区位于山西省太原盆地西南部的冲积平原内。通过对研究区内950个样品中碘含量的分析测定可知,浅层水(<50m)、中层水(50～200m)和深层水(>200m)碘含量超标率分别为76.8%、70.3%和85.2%,其中,浅层水碘含量最高可达4117μg/L,是国家饮用水标准值(GB/T19380-2003,150μg/L)的27倍。地下水无机碘主要以I-存在,IO3-含量极少;约60%的样品中存在有机碘。研究结果表明,特殊的地形地貌及地下含水层结构特点是造成该地区地下水高碘的主要原因。此外,当地普遍采用中层或深层地下水进行农业灌溉的耕作方式及低洼地区的地表盐化都大大加剧了浅层地下水碘的积蓄。地下水碘的来源与研究区的海相、湖相和河相沉积有着不可分割的联系。本研究将为中国高碘地区的改水工程提供科学依据。The study area is located in southwest Taiyuan basin of Shanxi Province. Totally 950 water samples were collected from the shallow wells （≤50 m）, middle wells （50-200 m） and deep wells ≥200 m） . With ICP- MS and HPLC-ICP-MS methods, the authors determined the total iodine content and inorganic iodine content, which included iodine ion and iodine acid radical （I- and IO3-）. The results indicate that the proportions of iodic concentration that exceeds the standard are 76.8%, 70.3% and 85.2% in groundwater of three layers, respectively. The highest iodic concentration in the shallow groundwater is up to 4117μg/L, which is 27 times higher than the national standard of drinking water （150μg/L）. The main form of iodine in the groundwater is ionized iodine, with small amounts of iodate. About 60% water samples have organic iodine. The main causes for high iodine concentration in groundwater are special topography and aquifers in the study area, which results in hindered movement of groundwater. Furthermore, local agricultural irrigation using the middle or deep layer groundwater and salinization of surface soils in the low-lying lands has led to the increase of iodine in the shallow layer groundwater. Iodic source in groundwater is closely related to geological environment of marine, lacustrine and fluvial sediments. The results could offer scientific means to reforming water projects in high iodic water areas of China.

关 键 词：碘 地下水 太原盆地 

分 类 号：P641.3[天文地球—地质矿产勘探]