淮北平原干沟控制排水区地下水氮污染及健康风险评估  

Groundwater Nitrogen Pollution and Assessment of its Health Risks in a Drainage Zone Controlled Through Main Drainage Ditch in Huaibei Plain

作　　者：杨源[1] 李如忠[1] 王友贞[2] 沈涛[2] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]安徽省水利部淮委水利科学研究院,安徽蚌埠23300

出　　处：《安徽建筑大学学报》2014年第4期82-87,共6页Journal of Anhui Jianzhu University

基　　金：国家自然科学基金项目(51179042)

摘　　要：为了解干沟控制排水对地下水氮素污染的影响,于2012年8月至2013年7月,对利辛县车辙沟干沟控制区内的14个农田水位观测孔和13个农户水井,开展地下水位观测和各形态氮含量检测。在此基础上,对该区域地下水氮污染特征和健康风险状况进行分析与评估。结果表明:1研究区地下水NH4-N污染较为严重,而NO3-N和NO2-N则污染较轻,农田地下水的NH4-N、NO3-N、NO2-N和TN平均浓度分别为0.49、2.10、0.028和3.56mg·L-1,农户井水平均值分别为0.22、0.93、0.030和1.37mg·L-1;2农田地下水NH4-N与NO2-N、NO3-N与TN浓度表现出相似的变化特征,而井水中NO3-N和TN变化特征基本一致;3饮水暴露途径和皮肤接触吸收暴露途径的氮危险指数平均值分别为3.73×10-2和3.10×10-4,均远低于可接受阈值1.0,对人体健康的影响可以忽略不计。To investigate the effect of controlled drainage on groundwater nitrogen pollution ,14 obser-vation wells and 13 farmers＇wells in the Chezhegou control drainage zone in Lixin County ,situated in Anhui Huaibei Plain （China） ,were chosen to observe underground water levels and determine differ-ent types of nitrogen concentrations periodically ,from August 2012 to July 2013 .And then ,ground-water nitrogen pollution features were analyzed and its health risks were evaluated for the study areas . Results show that ① pollution of ammonium nitrogen （NH4 -N） in groundwater is worse than that of nitrate （NO3 -N ） and nitrite （NO2 -N ） nitrogen ,and mean concentrations of N H4 -N ,NO3 -N , NO2 -N and TN in agricultural areas are 0 .49 ,2 .10 ,0 .028 and 3 .56 mg L -1 ,respectively ,while 0 . 22 ,0 .93 ,0 .030 and 1 .37 mg L -1 for residential areas ,respectively .② In agricultural areas ,similar change characteristics are shown for NH4 -N and NO2 -N concentrations ,and NO3 -N and TN con-tents ,whereas in farmers＇wells ,it is displayed between NO3 -Nand TN .③ The mean values of haz-ard indexes for oral and dermal exposure paths are 3 .73 ＆#215; 10-2 and 3 .10 ＆#215; 10-4 ,respectively ,far be-low the accepted threshed value 1 .0 .

关 键 词：地下水 氮污染 健康风险评价 干沟 淮北平原 

分 类 号：X523[环境科学与工程—环境工程]