Spatial variability and health risk assessment of nitrogen pollution in groundwater in Songnen Plain
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Abstract:
In order to present the pollution distribution and influence of nitrogen in groundwater in Songnen Plain, characteristics of nitrate-nitrogen, nitrite-nitrogen, and ammonium-nitrogen are analyzed by statistics software. Semivariograms graph and spatial distribution maps of groundwater nitrate-nitrogen are described by ArcGIS. Then the risk of groundwater nitrate-nitrogen to human health is evaluated by the model of water environmental health risk assessment. The results show that the nitrate-nitrogen is the most serious pollution in groundwater and has a strong spatial variability (variation coefficient of it is 1.686). The groundwater nitrate-nitrogen fits the second spherical model well and the nugget is 2.423, the substrate effect is 0.575, which implies that nitrate-nitrogen concentration distribution is controlled by structural factors and random factors and the later has a stronger effect. The high risk of nitrate-nitrogen pollution mainly distributes in east and central high plain, which accounts for 88.78% of the total area. It should be paid more attention because the water in this region are mostly third class of water quality and has high risk to human health.
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Supported by National Natural Science Foundation of China(41072255) and Occurrence and Distributive Regularity of As， F and Salinity of Groundwater in Northeast Endemic Area(1212010634701).
