内蒙古河套平原地下水砷异常分布规律研究

通过对内蒙古河套平原砷异常区的实际调查、现场取样、测试、室内实验以及数据分析,得出本区高砷地下水的分布具有明显的地带性,其中双庙和三道桥、沙海和蛮会、白脑包和狼山、塔尔湖及胜丰5片为高砷水地带,从西向东呈不连续的条带状展布,而且与盆地沉降中心带相一致。同时分析了高砷地下水的分布规律及其与古地理环境特征、地下水环境演化的关系。通过研究,可以看出以还原环境为主的富含有机质的湖沼相沉积环境、特定的地质、地形条件为地下水砷异常的原因。

Distribution of abnormal groundwater arsenic in Hetao Plain, Inner Mongolia

This article reports our investigation of groundwater As in Hetao plain, Inner Mongolia. Based on field surveys, groundwater sampling, water analysis, laboratory experiments and data analysis, we found that the distribution of high As in groundwater exhibits a distinct spatial zonation. Five high As zones have been detected, including Shuangmiao-Sandaoqiao, Shahai-Manhui, 13ainaobao-Langshan, Taerhu, and Shengfeng, which are coincident with subsidence center of the basin. The relationship of the distribution of high As groundwater to the paleo-geographical environment and to the groundwater environmental evolution are discussed in details. We propose that As anomalism in groundwater possibly resulted from the combined effects of organic matter-enriched lacustrine sediments, geological setting and topographical characteristics.