| 杀扑磷在土壤色谱柱中的迁移及其模型拟合 |
| 摘要点击 2247 全文点击 2266 投稿时间：2007-09-19 修订日期：2007-10-29 |
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| 中文关键词 土壤色谱柱 迁移 模型拟合 杀扑磷 |
| 英文关键词 soil chromatographic column transport model simulation methidathion |
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| 中文摘要 |
| 基于液相色谱原理，建立了土壤色谱系统.在红壤和砂质灰潮土色谱柱中分别对杀扑磷在3种不同模拟土壤溶液（分别为0.01 mol·L-1CaCl2溶液、0.001 mol·L-1柠檬酸和0.01mol·L-1CaCl2的混合溶液、0.001mol·L-1苹果酸和0.01mol·L-1CaCl2的混合溶液），2种孔隙水流速度（11.46和22.92 cm·h-1）下的迁移行为进行了实验研究，获得了示踪剂Cl-和杀扑磷的穿透曲线（BTCs）.通过CXTFIT2.1软件，用局部平衡（LEA）对流-扩散方程（CDE）和化学非平衡两点模型（TSM）拟合了杀扑磷的BTCs，获得了物理和水动力学参数.研究表明，用TSM对本实验条件下杀扑磷迁移的仿真具有较高的精度，这为预测和控制有机磷农药在土壤环境中的迁移与归宿行为提供了理论依据. |
| 英文摘要 |
| With a liquid chromatographic column, methidathion transport behaviors in red soil and gray fluvo-aquic soil columns were studied，respectively. Three types of simulated soil solutions(0.01 mol·L-1 CaCl2, 0.01 mol·L-1 CaCl2+0.001 mol·L-1 citric acid, and 0.01 mol·L-1 CaCl2+0.001 mol·-1 malic acid) and two pore water velocities (11.46 and 22.92cm·h-1) were applied. The breakthrough curves (BTCs) of Cl- and methidathion were obtained in these soil column experiments. With Software CXTFIT2.1, the local equilibrium assumption (LEA) model and nonequilibrium two-site model (TSM) were used to simulate the observed BTCs of methidathion. Consequently, the physical and hydrodynamic parameters from the fitting results were obtained. This study suggests that the TSM based on nonequilibrium theory can be used as a useful approach to better quantifying methidathion transport, which provide guides for predicating and controlling the methidathion fate in environment. |
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