兰州地区DDT的环境多介质迁移和归趋模拟  

Simulation of multi-media transfer and fate of DDT in the Lanzhou Region

作　　者：董继元[1] 王式功[2] 高宏[1] 尚可政[2] 姚焕炬[1] 成刚[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,甘肃兰州730000 [2]兰州大学大气科学学院,甘肃兰州730000

出　　处：《生态环境学报》2009年第2期519-522,共4页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(40675077);国家"十一五"科技支撑计划项目(2007BAC03A10);国家科技支撑计划项目(2008BAC40B04-6)

摘　　要：利用LevelIII逸度模型模拟了稳态假设下DDT在兰州地区大气、水体、土壤和沉积物中的浓度分布。根据模拟结果计算了相间迁移通量。结果表明:农业施用是该区域DDT的主要来源,其主要的迁移过程是气-土沉降、气-水沉降、土壤侵蚀,土壤中降解和大气平流输出,这是DDT从研究区域消失的主要途径。土壤中DDT占总残留量的99.83%。在大气、水体、土壤和沉积物中的浓度分别为2.80×10-11mol·m-3,2.72×10-7mol·m-3,2.47×10-3mol·m-3和3.16×10-5mol·m-3。模型计算浓度与同期实测浓度吻合较好,验证了模型的可靠性,并通过灵敏度分析,确定了模型的关键参数。A level III fugacity model was used to simulate the concentration distribution of DDT in air, water, soil, and sediment in the Lanzhou region under steady-state assumptions. Based on simulation results, among-phase transfer fluxes were calculated. The results indicated that agricultural application was the main source of DDT in this region. The main transfer processes of DDT were deposition from air to soil, deposition from air to water, and soil erosion. The degradation in soil and air advection to leeward were the major route for DDT to disappear from the study area. DDT found in soil accounts for 99.83% of the total amount of residual. The DDT concentrations in air, water, soil, and sediments were 2.80×10^-11 mol·m^-3, 2.72×0^-7 mol·m^-3, 2.47×10^-3 mol·m^-3, and 3.16×10^-5 mol·m^-3, respectively. The reliability of the model was verified by the agreement between the calculated and measured concentrations in the same period. The key model parameters were determined by means of sensitivity analysis.

关 键 词：兰州地区 DDT 多介质逸度模型 迁移 归趋 

分 类 号：X142[环境科学与工程—环境科学]