中文摘要：

以从云南元阳采集的1个水稻土和1个非耕作土,按颗粒大小分组作为模型吸附剂,探讨磺胺甲噁唑在土壤上的吸附行为与土壤有机质的关系.结果表明,梯田水稻土对磺胺甲噁唑的吸附（Kd：1.33—5.08）明显高于非耕作土（Kd：0.27—1.53）.吸附强度与土壤C含量和O＋N＋S含量呈正相关,相关系数分别为0.953、0.917和0.769、0.809,说明土壤有机碳可能控制了磺胺甲噁唑的吸附,以有机碳为代表的憎水性吸附点位对吸附有较高的影响,憎水性作用为主导机理.

英文摘要：

Sulfonamides（SA） are widely used as human and veterinary pharmaceuticals.They are unavoidably discharged into the aquatic and soil environments.The environmental behavior and risk assessment of antibiotics have attracted special research attention.As the main sink of organic pollutants,soil controls their mobility and transformation,sequentially affects their bioavailability and environmental risk.This study used the paddy soil from Yuan Yang as the model adsorbent to investigate the sorption behavior of sulfamethoxazole on soil.The adsorption of sulfamethoxazole on paddy soil（Kd：1.33—5.08） was higher than that on the background soil without farming（Kd：0.27—1.53）.A good positive relationship existed between sorption and C-content（0.953,0.917） or O＋N＋S-content（0.769,0.809）.The higher correlation coefficient between sorption and C-content indicated that the sorption of sulfamethoxazole was likely controlled by organic carbon.The hydrophobic sites were mainly contributed to the sorption by hydrophobic interaction which was the dominant sorption mechanism.