Krutz Larry Jason, Senseman Scott Allen, McInnes Kevin Joseph, Zuberer David Allen, Tierney Dennis Patrick
Department of Soil and Crop Sciences, Texas Agricultural Experiment Station, Texas A&M University, College Station, Texas 77843-2474.
J Agric Food Chem. 2003 Dec 3;51(25):7379-84. doi: 10.1021/jf0348572.
Adsorption and desorption of atrazine and its metabolites in vegetated filter strip soil (VFS) has not been evaluated, yet these data are needed to predict the transport of these compounds through the VFS. Adsorption and desorption parameters for atrazine, desethylatrazine (DEA), deisopropylatrazine (DIA), and hydroxyatrazine (HA) were compared between a cultivated Houston Black clay (CS) and an adjacent 12-year-old VFS established in a mixed stand of bermudagrass [Cynodon dactylon (L.) Pers.] and buffalograss [Buchloe dactyloides (Nutt. Engelm)]. Adsorption and desorption isotherms were determined by batch equilibrium. The evaluated chemical and physical properties of the VFS and CS were similar with the exception of a 1.7-fold increase in the organic carbon content of the VFS. Adsorption and desorption coefficients for atrazine were at least 59% higher in VFS than in CS. The adsorption coefficient for HA was 48% higher in VFS compared with CS, but desorption was not statistically different between soils. Adsorption and desorption coefficients for DEA and DIA were not statistically different between soils. The predicted order of mobility in CS is HA < atrazine = DIA = DEA. In VFS, the predicted order of mobility is HA < atrazine = DIA < DEA. These data indicate that the higher organic carbon in VFS will likely retard the transport of atrazine and HA to surface and ground waters; however, the transport rates of DEA and DIA will be similar between soils.
尚未评估植被过滤带土壤（VFS）中阿特拉津及其代谢物的吸附和解吸情况，但预测这些化合物在VFS中的迁移需要这些数据。比较了在休斯顿黑黏土耕地（CS）和相邻的由百慕大草[狗牙根（L.）Pers.]和野牛草[野牛草（Nutt. Engelm）]混种形成的12年生VFS中，阿特拉津、去乙基阿特拉津（DEA）、去异丙基阿特拉津（DIA）和羟基阿特拉津（HA）的吸附和解吸参数。通过批次平衡法测定吸附和解吸等温线。除VFS的有机碳含量增加了1.7倍外，VFS和CS的化学和物理性质评估结果相似。VFS中阿特拉津的吸附和解吸系数比CS中至少高59%。VFS中HA的吸附系数比CS高48%，但两种土壤间的解吸没有统计学差异。两种土壤间DEA和DIA的吸附和解吸系数没有统计学差异。在CS中预测的迁移顺序为HA＜阿特拉津 = DIA = DEA。在VFS中，预测的迁移顺序为HA＜阿特拉津 = DIA＜DEA。这些数据表明，VFS中较高的有机碳可能会阻碍阿特拉津和HA向地表水和地下水的迁移；然而，两种土壤间DEA和DIA的迁移速率将相似。
