氟啶胺在土壤中的吸附解吸与淋溶特性

Adsorption-desorption and leaching characteristics of fluazinam in soils

采用批量平衡法研究了氟啶胺在南京黄棕壤、江西红壤、东北黑土中的吸附解吸特性.结果表明,25℃下,氟啶胺在3种供试土壤中的等温吸附-解吸曲线能较好地符合Freundlich模型,其吸附常数分别为南京黄棕壤119.34,江西红壤202.23,东北黑土311.88,与土壤有机质含量、阳离子代换量和粘粒含量有良好的相关性,相关系数分别为0.9973,0.9690,0.8586.土壤对氟啶胺的吸附自由能变化均小于40kJ/mol,属于物理吸附.氟啶胺在3种土壤中均难淋溶.

The adsorption-desorption characteristics of fluazinam in three types of soil, including yellow soil from Nanjing, red soil from Jiangxi and black soil from Northeast China, were investigated using batch equilibration experiments. The results indicated the adsorption-resorption isotherms of fluazinam in threedifferent soils fairly fitted the Freundlich model at 25℃ with the adsorption constants of 119.34, 202.23, 311.88, respectively, which showed good correlations with organic matter （OM）, cation exchange capacity （CEC） and clay content of the soils with the correlation coefficient being 0.9973, 0.9690, 0.8586. The variation of free energy of sorption was less than 40 KJ/mol, suggesting that the adsorption type belonged to the physical adsorption. And the column leaching results of fluazinam demonstrated that fluaziam was hard to leach in three types of soils.