Adsorption and transport of imazapyr through intact soil columns taken from two soils under two tillage systems
Adsorption and transport of imazapyr through intact soil columns taken from two soils under two tillage systems
复制标题
DOI：
10.1016/j.geoderma.2015.03.016
复制
发表时间：
2015-08
期刊：
影响因子：
6.1
通讯作者：
Carolina Porfiri;J. C. Montoya;W. C. Koskinen;M. P. Azcarate
中科院分区：
文献类型：
--
作者：
Carolina Porfiri;J. C. Montoya;W. C. Koskinen;M. P. Azcarate
研究了长期常规耕作（CT）和免耕（NT）条件下，咪唑烟酸（IMZ）在两种不同理化性质土壤中的吸附和迁移规律。采用间歇平衡法和高效液相色谱分析程序进行吸附。通过完整的土芯进行置换实验，使用IMZ作为反应性溶质和溴离子（Br-）作为非反应性溶质。采用平衡（CDEeq）和非平衡（CDEon-eq）传输模型（CXTFIT 2.1）描述穿透曲线（BTC）。IMZ仅被NT土壤吸附，Kd值范围为0.22至1.1 L kg− 1。粘粒含量、pH值和CEC值是影响IMZ吸附的主要因素。混溶驱替研究表明，几乎所有的土壤水分都是移动的，迁移与物理平衡条件有关。在使用IMZ的柱实验中发现了吸附不平衡的一些证据;阻滞因子接近1，表明该化合物的吸附性低，浸出潜力高。
The objective of this work was to study the sorption and transport of imazapyr (IMZ) in two soils with different physical–chemical properties, subject to long-term conventional tillage (CT) and no-tillage (NT) systems. Sorption was carried out using batch equilibrium method and high performance liquid chromatography analytical routines. Displacement experiments through intact soil cores were done using IMZ as reactive solute and bromide (Br-) as non-reactive solute. Equilibrium (CDEeq) and non-equilibrium (CDEnon-eq) transport models (CXTFIT 2.1) were employed to describe the breakthrough curves (BTCs). IMZ was only sorbed by NT soils withKdvalues ranging from 0.22 to 1.1 L kg− 1. Clay content, pH and CEC values were the main factors affecting the sorption of IMZ. Miscible displacement studies showed that almost all the soil water was mobile and transport was related to physical equilibrium conditions. Some evidence of sorption non-equilibrium was seen in column experiments with IMZ; retardation factors were close to one, demonstrating the low sorption and the high potential to leach of this compound.