地下水亚硝酸盐污染风险分析：以沈阳冲洪积扇农业灌区为例

为验证亚硝酸盐污染地下水的风险评价方法，针对农业非点源污染引起的地下水亚硝酸盐污染问题，以沈阳冲洪积扇区为例，进行亚硝酸盐污染地下水风险分析。采用SPSS18.0软件的因子分析法，对包气带岩性样品的X衍射结果以及相应的有机质、亚硝酸盐含量等进行因子分析，确定土壤中亚硝酸盐主要来源于氮肥。在此基础上，针对传统DRASTIC模型的不足，结合研究区实际特征提出地下水脆弱性DRSICLN模型。基于GIS软件，确定沈阳冲洪积扇区地下水亚硝酸盐污染风险的3个等级，并结合地下水中NO2-N等值线图进行对比，结果表明，DRSICLN模型适用于研究区地下水污染风险评价。

Analysis of Nitrite Pollution Risk of Groundwater: An Example of Proluvial Fan Agriculture Irrigation District of Hunhe River

In order to verify the nitrite pollution risk assessment method. Pointing at nitrite pollution risk of groundwater caused by agricultural nonpoint-source pollution, alluvial-proluvial fan in Shenyang is as an example to analyze nitrite contamination risk of groundwater. Factor analysis in SPSS18.0 is used to analyze X-ray diffraction results,organic matter and nitrite content of vadose zone lithology samples, nitrogenous fertilizer is determined as the source of nitrite in the soil. On this basis, pointing at the lack of traditional DRASTIC model, combing with the actual characteristics of the study area, we propose DRSICLN model. Based on GIS software, nitrite pollution risk in the study area is graded in three levels, combing with the NO2-N contour map of groundwater. The results show that the DRSICLN model is fit to assess pollution risk of groundwater.