摘要
在区域自然地理和水文地质条件分析的基础上,对呼和浩特市托克托县潜水的pH值、氧化还原电位(Eh)、化学需氧量(CODMn)、氨氮、亚硝态氮、硝态氮6项指标的相关性进行了分析,结果表明:地下水中氨氮浓度与Eh值呈负相关关系,与CODMn浓度呈正相关关系。结合区域地下水流动系统特征,揭示了潜水中NH3-N,NO2-N,NO3-N的浓度空间分布特征及变化的原因:地下水的补、径、排特征控制着区域潜水的氧化还原环境,由补给区到排泄区氧化还原电位呈逐渐降低趋势;受地下水所处氧化还原环境影响,东南部地下水补给区潜水中硝态氮浓度普遍较高,氨氮浓度普遍较低,向西至大黑河沿岸硝态氮浓度逐渐降低,而氨氮浓度相对升高;牧业养殖废水和废物的无序排放是局部区域地下水中氮化物含量异常升高的主要原因。
The physical geography and hydrogeological condition in unconfined water of Tuoketuo County, Inner Mongolia were studied toanalyze the correlations of pH value, redox potential（ Eh） , chemical oxygen demand（C0DMn ） , ammoniacal nitrogen, nitrite nitrogen andnitrate nitrogen concentrations. The analysis finds out that the NH4 -N concentration in the groundwater is negatively correlated with Eh, butpositively correlated with CODMn. Combined with the feature of regional groundwater flow system feature, the spatial distribution and formationmechanisms of NH3 -N,NO2 -N and NO3 -N in unconfined water are revealed： the oxidation-deoxidation environment of groundwater is affectedby the groundwater flow field, the redox potential decreases from recharge area to drainage area. Influenced by oxidation-deoxidationenvironment, in the groundwater recharge area of the northeast, the content of NO3 -N is high and the content of NH3 -N is low generally. Tothe west direction along the Dahei River the NO3 -N concentration decreases and the NH3 -N increases. The unreasonable discharge of animalmanure and wastewater are the major factors that caused nitrogen pollution in the groundwater of sub-area.
出处
《人民黄河》
CAS
北大核心
2016年第8期73-76,共4页
Yellow River
基金
国家自然科学基金资助项目(41562020)
