CESAM and Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
J Agric Food Chem. 2010 Mar 10;58(5):3101-6. doi: 10.1021/jf903937d.
Sorption of atrazine on soils subjected to three different organic amendments was measured using a batch equilibrium technique. A higher K(F) value (2.20 kg(-1)(mg L(-1))(-N)) was obtained for soil fertilized with compost, which had a higher organic matter (OM) content. A correlation between the K(FOC) values and the percentage of aromatic carbon in OM was observed. The highest K(FOC) value was obtained for the soil with the highest aromatic content. Higher aromatic content results in higher hydrophobicity of OM, and hydrophobic interactions play a key role in binding of atrazine. On the other hand, the soil amended with farmyard manure had a higher content of carboxylic units, which could be responsible for hydrogen bonding between atrazine and OM. Dominance of hydrogen bonds compared to hydrophobic interactions can be responsible for the lower desorption capacity observed with the farmyard manure soil. The stronger hydrogen bonding can reduce the leaching of atrazine into drinking water resources and runoff to rivers and other surface waters.
采用批量平衡技术测量了受三种不同有机改良剂处理的土壤对莠去津的吸附作用。用堆肥施肥的土壤得到了更高的 K(F) 值（2.20 kg(-1)(mg L(-1))(-N)），这是因为其有机质（OM）含量更高。还观察到 K(FOC) 值与 OM 中芳香碳的百分比之间存在相关性。在芳香碳含量最高的土壤中获得了最高的 K(FOC) 值。较高的芳香碳含量会导致 OM 的疏水性增加，而疏水性相互作用在莠去津的结合中起着关键作用。另一方面，添加了农家肥的土壤具有更高含量的羧酸单元，这可能是莠去津与 OM 之间氢键结合的原因。与疏水性相互作用相比，氢键的优势可能是导致农家肥土壤解吸能力较低的原因。更强的氢键可以减少莠去津进入饮用水资源和径流到河流和其他地表水的淋失。
