Key Laboratory of Semi-Arid Climate Change, Ministry of Education, Lanzhou University, Lanzhou 730000, China.
Chemosphere. 2010 Sep;81(4):529-35. doi: 10.1016/j.chemosphere.2010.07.035. Epub 2010 Aug 17.
A level IV fugacity model is used to simulate the fate and transfer of DDT in the Lanzhou area over a 67-year period from their introduction into agricultural field until 2019. The established model is successfully applied to simulate the transfer processes and the concentration distribution of DDT in four environmental compartments: air, water, soil, and sediment in Lanzhou area under non-steady state assumptions. Furthermore, the calculated results agree well with monitoring data from the literature in same period of time. We assume 20% of the total usage of DDT enters into air and 80% enters the soils. The results indicate that the main source of DDT in the area is agricultural application, the biggest bulk sink is soil (accounting for 99.8% of total amount in the environment). Among all the transfer processes, the deposition from air to soil, deposition from air to water, soil erosion, and sedimentation from water to sediment are the primary processes, and the degradation in soil and air are the key process of DDT disappearance.
采用 IV 级逸度模型模拟了滴滴涕（DDT）在兰州地区从引入农田到 2019 年 67 年间的归宿和迁移。在所建立的模型中，成功模拟了 DDT 在四个环境介质（空气、水、土壤和沉积物）中的迁移过程和浓度分布。此外，计算结果与同一时期文献中的监测数据吻合较好。我们假设 DDT 的总用量有 20%进入大气，80%进入土壤。结果表明，该地区 DDT 的主要来源是农业应用，最大的汇是土壤（占环境中总量的 99.8%）。在所有的迁移过程中，大气向土壤的沉降、大气向水体的沉降、土壤侵蚀和水体向沉积物的沉降是主要过程，而土壤和大气中的降解是 DDT 消失的关键过程。
