Abstract
Detailed study of the chemical analysis results of 14 shallow groundwater samples, representing different land use types, were carried out in an attempt to identify the hydrochemical properties and influencing factors of nitrogen pollution for the Urban planning area in Suzhou city, China. Hydrochemical properties were analyzed by water quality and its’ main influential factors of nitrogen pollution were analyzed by using ArcGIS geostatistics module and factor analysis method. The results show that the water chemistry type of shallow groundwater in the study area was mainly HCO3-Ca·Na type, the shallow groundwater was in a strong reducing geological environment rich in organic matter. Shallow groundwater shows a significant nitrogen occurrence with high ammonia and low nitrate owing to the strong reducing geological environment with abundant organic matter and low oxygen in the study area.The occurrence forms of nitrogen in shallow groundwater were controlled by the oxidation-reduction environment. Factor analysis shows that the nitrogen content and pollution of shallow groundwater are mainly controlled by human activities and geological conditions, followed by formation lithology, redox conditions and topography.
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