多种方法识别青岛大沽河平原区地下水硝酸盐污染来源  

Multiple methods to recognize sources of underground water nitrate contamination in plain area of Dagu River,Qingdao,China

作　　者：刘贯群[1,2,3] 周书玉[2] 黄修东 王婷[2] 徐栋[2] 岳彩东[2] 

机构地区：[1]海洋环境与生态教育部重点实验室中国海洋大学,青岛266100 [2]中国海洋大学环境科学与工程学院,青岛266100 [3]山东省海洋环境地质工程重点实验室,青岛266100 [4]青岛水文局,青岛266071

出　　处：《环境科学学报》2017年第1期347-356,共10页Acta Scientiae Circumstantiae

基　　金：水利部科技推广计划项目(No.TG 1519);青岛市应用基础研究计划项目(No.14-2-4-24-jch)~~

摘　　要：硝酸盐是地下水中最常见的一种污染物,其来源的确定对于硝酸盐污染的治理非常重要.大沽河是山东半岛主要河流之一,其地下水含水层是重要的饮用水来源,但近年硝酸盐含量普遍很高,除了少数位置外,都超过了中华人民共和国国家标准,有必要对其污染来源进行研究.采用N同位素、N-O同位素和卤化物比率3种方法综合确定了硝酸盐污染来源.研究发现:该区地下水的N同位素比率值表明76%的取样点的硝酸盐来源与粪肥、污水、大气沉降、化肥和土壤N有关;氮氧同位素的结果显示80%的硝酸盐污染源为粪便或污水;卤化物比率也证明了这一来源.这和该区蔬菜生产大量施用粪肥和化肥进行农业种植是一致的,两者的混合施用使同位素比率和卤化物比率偏高,硝酸盐的主要污染来源是化肥和粪肥.多种方法相结合能够更准确地确定地下水硝酸盐的污染来源.Determination of pollutant sources is very important for controlling nitrate contamination,one of the most common groundwater contaminants in the world. The Dagu River is one of the major rivers in Shangdong Peninsula and its alluvium aquifer of groundwater is an important water source for drinking water,which was found to exceed the Drinking Water Standards of China except local areas. Thus,it is necessary to study the pollutant sources.Nitrogen isotope（15N）,isotope ratio of nitrogen and oxygen（ δ18O and δ15N）,and the halide ratios were therefore used to identify nitrogen contamination sources. The δ15N value shows that 76% of groundwater samples were related to manure,sewage,precipitation,fertilizer,and N in soil; the δ18O andδ15N ratio indicated that 80% of the samples were focused on sewage or manure; halide ratios also supported the same conclusion. The combination use of manure and fertilizer made the δ15N and I / Na Br high,indicating manure and fertilizer are main sources for nitrate. Using varied methods can be more accurate in the determination the nitrate sources.

关 键 词：大沽河 地下水 硝酸盐污染 稳定同位素比率 卤化物 

分 类 号：X523[环境科学与工程—环境工程]