宁夏银北平原地下水中砷的分布特征及其富集因素  

Distribution and Enrichment of As in Groundwater in Northern Yinbei Plain

作　　者：田春艳[1] 张福存[2] 

机构地区：[1]中国地质大学生物地质与环境地质教育部重点实验室,武汉430074 [2]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《安全与环境工程》2010年第2期22-25,共4页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(40872157;40830748);中国地质调查局调查项目(1212010634714);中俄合作基金项目(NSFC-RFBR-40711120189);教育部新世纪优秀人才支持计划项目(NCET-07-0733)

摘　　要：通过对宁夏银北平原地下水中砷的分布特征、来源及富集因素进行研究,结果表明:银北平原地下水砷异常地段的分布具有明显的地带性,从山前洪积倾斜平原前缘向冲湖积平原中心,地下水中砷含量递增,高砷地下水沿黄河河道自南向东北局部呈点状分布,总体上呈条带状展布,且东北部砷含量普遍高于西南部,主要富集在0～40 m深度的含水层中;引黄灌溉的黄河水与贺兰山区的煤系地层是平原内地下水中砷的主要来源;特殊的古地理环境特征、地下水径流条件、氧化还原环境及干旱半干旱的气候条件是地下水中砷富集的重要因素。This paper discusses the distribution, sources and enrichment factors of arsenic in the groundwater in Northern Yinchuan Plain. The study indicates that： first, the distribution of high As in groundwater exhibits a distinct spatial zonation. From the piedmont alluvial plain to the center of the alluvial-lacustrine plain, the content of As in the groundwater becomes higher. High-arsenic groundwater is distributed by spotted state regionally,but by banding macroscopicly,stretching south-northeast in Yinchuan Plain. High-arsenic groundwater is mostly enriched in the depth of 0-40 mSecond, the imported water from the Yellow River and from the coal measure strata in the Helan Mountain is the main source of arsenic in groundwater in the plain. And third, the special paleo-geographical environmental feature, groundwater run-off condition, anoxic environment and arid or semi-arid climate play great important role in arsenic enrichment.

关 键 词：地下水 砷 分布特征 富集因素 银北平原 

分 类 号：X523[环境科学与工程—环境工程]