Pusino Alba, Fiori Maria Giovanna, Braschi Ilaria, Gessa Carlo
Dipartimento di Scienze Ambientali Agrarie e Biotecnologie Agro-Alimentari, Università di Sassari, Viale Italia 39, 07100 Sassari, Italy.
J Agric Food Chem. 2003 Aug 27;51(18):5350-4. doi: 10.1021/jf030105w.
The adsorption and desorption of the herbicide triasulfuron [2-(2-chloroethoxy)-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide] by three soils, soil organic matter (H(+) and Ca(2+)-saturated), and an amorphous iron oxide were studied. Adsorption isotherms conformed to the Freundlich equation. It was found that pH is the main factor influencing the adsorption in all of the systems. Indeed, the adsorption on soils was negatively correlated with pH. The highest level of adsorption was measured on soils with low pH and high organic carbon content. Moreover, it was found that humic acid is more effective in the adsorption compared with calcium humate (the pH values of the suspensions being 3.5 and 6, respectively). Experiments on amorphous iron oxide confirmed the pH dependence. Desorption was hysteretic on soils having high organic carbon content.
研究了除草剂苯磺隆[2-(2-氯乙氧基)-N-[[(4-甲氧基-6-甲基-1,3,5-三嗪-2-基)氨基]羰基]苯磺酰胺]在三种土壤、土壤有机质（H(+)和Ca(2+)饱和）以及一种无定形氧化铁上的吸附和解吸情况。吸附等温线符合弗伦德利希方程。研究发现，pH是影响所有体系吸附的主要因素。实际上，土壤吸附与pH呈负相关。在低pH和高有机碳含量的土壤上测得的吸附水平最高。此外，研究发现，与钙腐殖酸盐相比（悬浮液的pH值分别为3.5和6），腐殖酸在吸附方面更有效。无定形氧化铁的实验证实了对pH的依赖性。在高有机碳含量的土壤上解吸具有滞后性。
