地下水NO3--N污染已成为当今世界上一个日趋严重的环境问题和社会问题.本文在水文地质调查基础上, 应用地质统计学方法对所采集样品测试数据进行了分析, 结果表明呼和浩特市托克托县浅层地下水NO3--N分布极不均匀, NO3--N含量大于20 mg/L的地下水分布面积占全区总面积的72.1%, 广泛分布于古城镇以南的区域.少数井点地下水NO3--N含量已大于100 mg/L, 最高达304.6 mg/L, 已发展成为硝酸型地下水.通过采用水质解析法和化学平衡法分析地下水NO–3-N污染来源, 揭示了人类污水灌溉、粪便堆放、化肥施用等活动对托克托县地下水NO3--N污染有重要的驱动作用.%Groundwater NO3--N pollution has become an increasingly serious environmental and social problem in the world at present. Based on hydrogeological survey, the authors analyze the collected data by using the geostatistics method. The results show that the nitrate pollution in shallow groundwater in Togtoh county is not evenly distributed. The area of groundwater with NO3--N content higher than 20 mg/L covers about 1 015.71 km2, accounting for 72.1% of the whole area, and occurs extensively in the place south of Gucheng Town. The content of NO3--N in a small number of wells has been higher than 100 mg/L, up to 304.6 mg/L. Nitric acid groundwater has been found. Groundwater nitrate pollution source is analyzed by Water Quality Analysis and Chemical Balance Method. The results reveal that waste stacking, chemical fertilizer application, and sewage irrigation of the human activities have exerted an important driving role in the groundwater nitrate pollution of Togtoh county.
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