浑河冲洪积扇土壤硝酸盐污染特征及相关因素分析

土壤硝酸盐是地下水硝酸盐的重要来源,因此土壤硝酸盐特征研究对于土壤和地下水污染控制与修复具有重要意义。为了探讨沈阳浑河冲洪积扇硝酸盐污染特征,在浑河洪积扇横跨浑河设计了5个监测断面、50个取样点,每个取样点按0.8m进行了垂向深度取样和硝酸盐测定。随后,利用Hazen概率曲线确定了浑河冲洪积扇土壤硝酸盐含量的标准值,采用单因子指数法和内梅罗污染指数评价法,对不同断面和不同深度土壤硝酸盐的污染特征进行了分析,并将区域污染特征与区域土地利用类型、区域有机质含量进行关联分析,判定其对硝酸盐污染的影响。研究结果显示,本区硝酸盐浓度标准值约为2.58mg/kg;区域硝酸盐中度污染;排污河的存在、区域土地利用类型和区域有机质含量对区域硝酸盐污染关系密切,在分析硝酸盐污染过程中应予以重点考虑。

Characteristics and Factors of Nitrate Pollution in Soil in the Alluvial-pluvial Fan of Hun River

Soil nitrate is one of the critical sources of groundwater nitrate; therefore the study of the characteristics of soil nitrate is important for the control and remediation of soil and groundwater pollution. In order to investigate the pollution characteristics of soil nitrate in the alluvial-pluvial fan of Hun River, five monitoring sections and 50 sampling locations were designed in the alluvial-pluvial fan across the Hun River, and the soil samples were collected and conducted nitrate measurement in a vertical interval of every 0.8 m at each sampling location. The Hazen probability curve was used to determine the standard values of soil nitrate in the alluvial-pluvial fan of Hun River, and the single factor index method and Nemero pollution index evaluation method were used to analyze the pollution characteristics of soil nitrate at different depths and sections. The pollution characteristics were analyzed in association with the regional land use type and regional organic matter content to determine their impacts on nitrate pollution. The results showed that the standard nitrate concentration is 2.58 mg/kg and nitrate has medium level pollution in this area, and the existence of sewage river, regional land use type, and regional organic matter content can have significant impacts on nitrate pollution.