河套平原五原地区地下水Fe-As-H_2O体系中砷的吸附释放趋势  

A study of arsenic adsorption and release in Fe-As-H_2O system in Wuyuan County,Hetao Plain

作　　者：张翼龙[1] 曹文庚[1] 李江 刘海坤[1] 殷夏[1] 闫丰录[1] 董秋瑶[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北正定050803 [2]内蒙古地勘基金管理中心,内蒙古呼和浩特100010

出　　处：《地学前缘》2010年第6期67-71,共5页Earth Science Frontiers

基　　金：中国地质调查局"全国地下水资源及其环境问题调查评价"项目子项"河套平原地下水资源及其环境问题调查评价"(1212010913010)

摘　　要：通过在河套平原五原地区建立典型剖面,对从剖面上采集的水样进行测试分析,结合地质环境特征,得出五原剖面上各地质、地貌单元条件下砷在浅层地下水的赋存形态。应用美国地质调查局专业水文地球化学软件Phreeqc进行水文地球化学模拟,对五原地区地下水Fe-As-H2O体系中砷的吸附释放趋势进行讨论,得出五原剖面上扇前洼地砷酸盐主要表现为从羟基铁上解离释放出来;而黄河冲湖积平原地下水中As主要表现为在水中解离。黄河冲湖积平原地下水中Fe(OH)3对砷释放的抑制力远远高于扇前洼地。By establishing typical profiles in Wuyuan County,collecting water samples and making analyses,and combing the geological environmental characteristics,we got to know the occurrence state of arsenic species in shallow groundwater.Using USGS professional software Phreeqc to model hydrogeochemical condition,we have discussed the adsorption and release of arsenic in Fe-As-H2O system.The trends of the arsenic adsorption and release are affected by iron oxides and hydroxide;in the depression in front of the fan,the arseniate is mainly dissociated and released from the carbonyl iron;in the alluvial lacustrine plain of the Yellow River,the concentration of H3AsO4 progressively reduces and the arsenic is dissociated from water.The inhibition of Fe（OH）3 for the release of arsenic in the alluvial lacustrine plain is stronger than that in the depression in front of the fan.

关 键 词：河套平原 地下水 砷 铁 吸附释放 水文地球化学软件Phreeqc 

分 类 号：P641.3[天文地球—地质矿产勘探]