除草剂丁草胺在东北地区主要土壤中的吸附研究

Adsorption of butachlor in main types of soils in northeast of China

试验对除草剂丁草胺在东北地区主要土壤黑土、水稻土、盐碱土、白浆土中的吸附进行了研究。结果表明,经拟合Freundlich等温式最适合描述丁草胺在土壤中的吸附,其吸附常数Kd大小顺序为:黑土>水稻土>盐碱土>白浆土;吸附常数Kd与土壤性质相关性大小顺序为:土壤有机质>阳离子交换量(CEC)>pH>粘土矿物含量。根据丁草胺在4种土壤中的有机碳吸附常数及吸附自由能的大小,确定丁草胺在土壤中属于移动性弱化合物,在土壤中的吸附以物理吸附为主。

TThe adsorption of Butachlor in four main types of soils （black soil, paddy soil, saline soil and planosol soil） in Northeast China was studied in this experiment. The results showed： the adsorption isotherm of Butachlor in soils could be fit to Freundlich formula. The adsorption constant Kd of Butachlor in four soils was as follow： black soil〉paddy soil〉saline soil〉planosol soil. The relativity order of Kd and the soil properties was as follow： organic matter content〉CEC〉pH〉clay content. According to the analysis on organic carbon adsorption constant and adsorption free energy, the movement of Butachlor in soils was weak which indicated the adsorptive mechanism of Butachlor in soils was mainly physical adsorption.