Effects of pore-water velocity and pH on Cu,Pb,Zn and Cd transport in quartz sands were studied,through a stable flow miscible displacement experiment,and breakthrough curves(BTCs) of the tracer bromide(Br-) and Cu/Pb/Zn/Cd were obtained. And their adsorption coefficients were determined through indoors batch equilibrium experiments and then their retardation factors(Rd) were worked out. Based on the results of the experiments with the aid of Software CXTFIT2.1 (A nonlinear least-squares optimization approach) BTC of Br- was fitted with the equilibrium CDE model,yielding dispersion coefficient (D). On such a basis,BTCs of Cu,Pb,Zn and Cd in conditions of different pore-velocity and pH were fitted with the non-equilibrium CDE model,and dynamics of their concentrations at various depths and in parallel experiment were predicted. Results show that the transport of Cu/Pb/Zn/Cd in quartz sand columns increased with pore-water velocity,but decreased with rising pH. Conclusively,the non-equilibrium-theory-based two-site model describes better transport of Cu,Pb,Zn and Cd in such a scenario as of this experiment.
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孙军娜,徐绍辉. Cu/Pb/Zn/Cd在石英砂中的迁移实验及模拟[J].土壤学报,2010,47(6):1101-1109. DOI:10.11766/trxb200905190219 sunjunna, xushaohui. Modeling Cu/Pb/Zn/Cd transport in quartz sand column[J]. Acta Pedologica Sinica,2010,47(6):1101-1109.