摘要
为了解华北平原地下水中硝酸盐的分布状况及影响因素,对石家庄市滹沱河冲洪积扇四个地下水单元的地下水样品进行采集与分析。结果表明:在115个样品中,64.35%的样品水质符合《地下水质量标准》(GB 14848—1993)Ⅴ类标准,地下水质量总体较差,主要的污染指标为硝酸盐和总硬度,超标点位主要分布在西北部两个地下水单元。硝酸盐的浓度范围为0.24~440 mg·L^(-1),其平均浓度与最高浓度分别为GB/T 14848—1993中硝酸盐Ⅲ类标准值的3倍与22倍,属于严重污染;不同地下水单元中硝酸盐浓度差异较大,在研究区内基本呈现从西北到东南、从浅层到深层逐渐降低趋势。除水文地质条件对地下水中硝酸盐含量有重要影响外,污染源类型及其分布也起到了重要作用。通过相关性分析,初步认为研究区西北部两个地下水单元中硝酸盐污染主要来源于点源类型的生活污水及畜禽养殖废水,东南部的两个地下水单元的硝酸盐污染主要来源于面源类型的农业施肥。
In order to identify the contamination profiles and spatial distribution of nitrate in the North China Plain,115 groundwater samples,collected from Hutuo River pluvial fan in Shijiazhuang City,Hebei Province,were analyzed according to the parameters listed in the Quality Standard for Ground Water(GB 14848—1993).Results indicated that the water quality was generally poor.The 64.35% of total samples only met the Class V standards.Nitrate and hardness were the main failed indicators.The sampling sites with poor water quality were mainly located in the two groundwater units in the northwest area.The nitrate concentrations ranged from 0.24 to 440 mg·L^(-1),with the maximum and the average concentrations being 22 and 3 times higher than the Class Ⅲ standard value,respectively.The nitrate concentrations spatially decreased from the north-west to the south-east and from shallow to deep stratum of the research area.Hydrogeological conditions had an important effect on the distribution of nitrate in groundwater.In addition,the type and distribution of pollution sources also had great contributions.Correlation analysis between chloridion and nitrate,and between total hardness and nitrate indicated that nitrate in the two units of the north-west area came from the discharges of domestic wastewater and livestock and poultry breeding wastewater from the point sources,while nitrate in the other two units located in the south-east area was mainly resulted from the agricultural non-point sources.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2016年第5期947-954,共8页
Journal of Agro-Environment Science
基金
环保公益性行业科研专项(201409029)
关键词
硝酸盐
地下水
污染特征
空间分布
滹沱河冲洪积扇
nitrate
groundwater
pollution profile
spatial distribution
alluvial-pluvial fan of Hutuo River