Analysis on the Distribution Characteristics and Influencing Factors of"Three Nitrogen"in Shallow Groundwater in the Central Urban Area of Zhengzhou
The landform types in the central urban area of Zhengzhou are divided into Yellow River alluvial plain,mountain front alluvial plain,and loess hills.Different landform types have different hydrogeological characteristics.Based on the distribution characteristics of three landform types and their pollution sources,groundwater sampling points are set up to study the relationship between the"three nitrogen"content in shallow groundwater and the distribution of pollution sources,the depth of groundwater level,the lithology of the aeration zone,and the hydrochemical environment.The results show that the groundwater quality in the central urban area of Zhengzhou is greatly affected by the content of nitrate nitrogen and ammonia nitrogen,and is less affected by the content of nitrite nitrogen.The range of nitrate nitrogen content exceeding the standard in 2023 has significantly decreased compared to 2020,and there has been a local increase in ammonia nitrogen content.The changes in"three nitrogen"content,especially ammonia nitrogen content,in the Yellow River alluvial plain area should be taken seriously.The changes in the acid-base and redox environments of groundwater can to some extent cause changes in the"three nitrogen"content in groundwater.When groundwater is in an oxidizing environment,the nitrate nitrogen content in groundwater increases while the ammonia nitrogen content decreases.
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