郊区污灌区铅含量调查及潜在生态风险评价  

Investigation of Lead and Its Potential Ecological Risk Evaluation inWastewater Irrigation Area in Suburbs

作　　者：张庆辉[1] 王贵[2] 赵捷[1] 朱晋[1] 

机构地区：[1]包头师范学院资源与环境学院,内蒙古包头014030 [2]鄂尔多斯职业学院,内蒙古鄂尔多斯017000

出　　处：《中国农学通报》2012年第23期237-241,共5页Chinese Agricultural Science Bulletin

基　　金：内蒙古自治区高等学校科学研究项目"包头市四道沙河流域工业废水对生态环境的影响"(NJ09142)

摘　　要：为了评价包头市南郊污水灌溉区农田表层土壤、水系沉积物Pb潜在生态风险,按照线型、剖面型和"梅花型"取样,测定不同研究点、区水系沉积物和土壤重金属Pb含量,分析重金属Pb对生态环境的影响,并对灌溉区农田表层土壤环境质量进行评价。结果表明,研究区污水灌溉农田土壤重金属元素Pb含量是北郊地下水灌溉农田土壤重金属元素Pb含量的1.25倍。研究区主污渠滨岸泛滥区Pb含量最大值为565.40mg/kg,其中污灌区农田土壤Pb含量最大值为22.12mg/kg、平均值为19.46mg/kg;种植粮食和蔬菜的Pb单因子污染指数最大值分别为0.28、0.44,污染指数Pi<0.7;潜在生态风险综合指数Ei为41.18,即Ei<90。说明土壤质量状况尚未达到污染级别,且潜在生态风险程度属于轻度。但是,人类活动导致污灌区Pb明显积累,应该引起重视。In order to evaluate the environmental quality of heavy metal Pb in the surface soil and stream sediment in wastewater irrigation area of Baotou southern suburbs （WIBS）. Samples were collected by using linear, profile-based and quincunx to determine the content of Pb in stream sediment and soil in different locations and regions, to analyze effects of Pb on the ecological environment, and the soil environmental quality in the research area. The results showed that the content of soil Pb in the WIBS was larger than 1.25 times of the farmland in groundwater irrigation in Baotou northern suburbs. The highest content of Pb in the main inundation sewage drainage of the research area was 565.40 mg/kg, and the highest content of soil Pb in the WIBS was 22.12 mg/kg, the average value was 19.46 mg/kg, the maximum monomial pollution index of Pb growing crop and vegetables were 0.28 and 0.44, and pollution index （Pi） was less than 0.7. Composite index of potential ecological risk was 41.18 and composite index （Ei） was less than 90. It indicated that the environmental quality of heavy metal Pb in the WIBS was lower than pollution levels and potential ecological risk degree belonged to mild. Heavy metals Pb was accumulated in the WIBS as human activities, people should pay attention to lead pollution with potential ecological risk.

关 键 词：铅 潜在生态风险 调查 污灌区 郊区 

分 类 号：X833[环境科学与工程—环境工程]