摘要
通过采集地下水样品进行分析测定,运用单因子指数法进行污染评价,利用GIS获取污染物NO_3^--N的空间分布特征,对NO_3^--N的污染特征进行分析,借鉴美国环境保护署的人体健康风险评价模型对泾惠渠灌区地下水污染物NO_3^--N的人体健康风险做出评价。结果表明:研究区地下水中NO_3^--N的含量严重超标,平均含量为29.78mg/L,区域内99.40%超过《生活饮用水卫生标准》(GB5479-2006)标准值;化肥、人畜粪便和工业废水是造成泾惠渠灌区地下水NO_3^--N污染的主要来源;地下水中NO_3^--N含量主要受地下水埋深、包气带岩性等因素的影响;NO_3^--N的非致癌风险值超限值1,对当地居民会造成一定的健康危害,非致癌风险区域面积比例达66.55%。
In order to investigate the contamination characteristics and the potential human health risk of nitrate in shallow groundwater at Jinghui irrigation district in Shaanxi province,samples of groundwater were collected and their physical and chemical characteristics were analyzed by laboratory test. The contamination was evaluated by single factor index method,and the spatial distribution of NO3～--N was obtained by GIS. The human health risk was assessed by using Human Health Risk Assessment Model. The results show that the concentration of NO3～--N of groundwater in study area has exceeded the limits,the average concentration of NO3～--N in groundwater is 29. 78 mg/L. The fertilizer,human and animal wastes from towns and villages as well as industrial wastewater are the main sources of nitrate contamination. Soil type,groundwater depth,season are the impact factors that influence the distribution and transformation of nitrate in groundwater. The non-carcinogenic hazard index of NO3～--N significantly exceeded the limits of 1. At the spatial distribution aspect,the area ratios of the non-carcinogenic risk caused by NO3～--N is 66. 55%.
作者
徐斌
张艳
XU Bin;ZHANG Yan(School of Environmental Science and Engineering, Chang＇ an University, Xi＇ an 710054, China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang＇ an University, Xi＇ an 710054, China;School of Earth Science and Resources, Chang＇ an University, Xi＇ an 710054, China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2018年第7期70-75,共6页
Journal of Arid Land Resources and Environment
基金
国家外专局和教育部项目
高等学校学科创新引智计划(B08039)
国家自然科学基金项目(41273104)
中央高校基本科研业务费专项资金(310829171005
310827171006)资助
关键词
地下水
硝酸盐污染
人体健康
风险评价
泾惠渠灌区
groundwater
nitrate contamination
human health
risk assessment
Jinghui irrigation district
