南方典型农田区浅层地下水污染特征

发布时间：2018-03-30 13:42

  本文选题：天然水化学　切入点：有机物　出处：《环境科学》2016年12期

【摘要】：为分析我国南方农田生态系统浅层地下水污染特征及主要污染物的地球化学行为,以太湖流域典型农田区域为对象,联合常规水质分析方法、荧光光谱技术和多元统计分析手段,研究了浅层地下水的水化学特性、溶解性有机物和重金属分布特征及其成因.结果表明,研究区水体呈还原态,浅层地下水的水化学类型为HCO3-Ca·Na,三氮含量中硝态氮最高,氨氮、亚硝态氮次之.类腐殖酸、类色氨酸和类酪氨酸为浅层地下水中溶解性有机物的主要组分,由陆源与生物内源双重贡献.影响地下水中溶解性有机物分布的主要因素为地表水补给及地下水流方向.所检测的9种重金属元素,Fe和Cr平均浓度高于国家地下水环境质量Ⅲ类标准,且部分点位的Fe、Cr、Mn、Zn含量存在超标.相关性分析结果显示,荧光性有机物变化特征可较好反映浅层地下水的污染状况,其中类蛋白物质与氨氮密切相关;Cu、Ni分布与DOC相关,且主要络合于小分子荧光性有机物上.
[Abstract]:In order to analyze the characteristics of shallow groundwater pollution and the geochemical behavior of main pollutants in the farmland ecosystem of southern China, the typical farmland area of Taihu Lake Basin is taken as the object, and the conventional water quality analysis method is combined. The characteristics of hydrochemistry, the distribution of dissolved organic matter and heavy metals and the causes of formation of shallow groundwater were studied by fluorescence spectroscopy and multivariate statistical analysis. The results showed that the water bodies in the study area were reduced. The hydrochemical type of shallow groundwater is HCO3-Ca Na, the nitrate nitrogen is the highest, ammonia nitrogen and nitrite nitrogen are the second, humic acid, tryptophan and tyrosine are the main components of dissolved organic matter in shallow groundwater. The main factors affecting the distribution of dissolved organic matter in groundwater are the recharge of surface water and the direction of groundwater flow. Class 鈪，

本文编号：1686171