Ma Ai-jun, Zhou Li-xiang, He Ren-hong
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Huan Jing Ke Xue. 2006 Feb;27(2):356-60.
Dissolved organic matter (DOM) can affect the environmental behaviors of herbicides in soil. Batch adsorption and column experiments were conducted to measure the sorption and leaching of napropamide in soils in the presence of DOM derived from green manure (GM) and sewage sludge (SS). DOM reduced sorption of napropamide significantly onto the tested soils, consequently which facilitated the transport of napropamide exhibited by soil column experiment. The sorption inhibition and the increased mobility of napropamide caused by DOM of GM origin were more significant than that of SS origin for the same soil. Within the selected concentration range of the napropamide and DOM in this study napropamide sorption isotherm could be described well by the Freundlich equation. In comparison with the control, DOM of GM and SS origins could reduce napropamide adsorption by 22.9% and 11.3% in the yellow-brown soil and 9.5% and 6.5% in the calcareous soil, respectively. Correspondingly, in the presence of DOM the leaching losses of napropamide in soil column increased by 73.42% and 26.87% in the yellow-brown soil and 43.54% and 28.29% in the calcareous soil, respectively.
溶解有机物（DOM）会影响除草剂在土壤中的环境行为。进行了批量吸附和柱实验，以测量在存在源自绿肥（GM）和污水污泥（SS）的DOM的情况下，萘丙酰胺在土壤中的吸附和淋溶情况。DOM显著降低了萘丙酰胺在受试土壤上的吸附，因此在土壤柱实验中促进了萘丙酰胺的迁移。对于同一土壤，GM来源的DOM引起的萘丙酰胺吸附抑制和迁移性增加比SS来源的更显著。在本研究中萘丙酰胺和DOM的选定浓度范围内，萘丙酰胺吸附等温线可用Freundlich方程很好地描述。与对照相比，GM和SS来源的DOM在黄棕壤中可使萘丙酰胺吸附分别降低22.9%和11.3%，在石灰性土壤中分别降低9.5%和6.5%。相应地，在存在DOM的情况下，萘丙酰胺在土壤柱中的淋溶损失在黄棕壤中分别增加了73.42%和26.87%，在石灰性土壤中分别增加了43.54%和28.29%。
