Huang X, Lee L S
Department of Agronomy, Purdue Univ, West Lafayette, IN 47907-1150, USA.
J Environ Qual. 2001 Jul-Aug;30(4):1258-65. doi: 10.2134/jeq2001.3041258x.
The increased use of animal waste-derived effluents for irrigation could result in the enhanced movement of pesticides through complexation with dissolved organic materials. Batch equilibrium studies were conducted to measure the interaction among soil, chlorpyrifos [O,O-diethyl O-(3,5,6-trichloro-2-pyridyl) phosphorothioate], and dissolved organic matter (DOM) from poultry, swine, and cow waste-derived lagoon effluents. All DOM was found to have a strong affinity for chlorpyrifos, resulting in reduced sorption of chlorpyrifos by soil, thus the potential for DOM-enhanced mobility. Effluent DOM was observed to sorb to soils. Thus, for increasingly higher soil mass to solution volume ratios, the effect of chlorpyrifos association with water-borne DOM on sorption decreases significantly. For high soil mass to solution volume ratios typical of soil profiles in the landscape, the potential for DOM-enhanced transport will be greatly attenuated. Dissolved organic matter concentration and the nonpolar nature of DOM in the lagoon effluent decreased with increasing residence time in the cells of the lagoon system, thus reducing the potential for DOM-enhanced transport.
越来越多地使用动物粪便衍生的废水进行灌溉，可能会导致农药通过与溶解有机物质络合而增强移动性。进行了批次平衡研究，以测量土壤、毒死蜱[O,O-二乙基-O-(3,5,6-三氯-2-吡啶基)硫代磷酸酯]以及来自家禽、猪和牛粪便衍生的泻湖废水中的溶解有机物（DOM）之间的相互作用。发现所有DOM对毒死蜱都有很强的亲和力，导致土壤对毒死蜱的吸附减少，从而存在DOM增强移动性的可能性。观察到废水DOM会吸附到土壤上。因此，对于土壤质量与溶液体积比越来越高的情况，毒死蜱与水中DOM结合对吸附的影响会显著降低。对于景观中典型土壤剖面的高土壤质量与溶液体积比，DOM增强运输的可能性将大大减弱。随着在泻湖系统池中的停留时间增加，泻湖废水中溶解有机物的浓度和DOM的非极性性质会降低，从而降低了DOM增强运输的可能性。
