Soil, Water and Environmental Science Department, University of Arizona, 429 Shantz Building, Tucson, AZ 85721, USA.
Chemosphere. 2009 Oct;77(6):877-82. doi: 10.1016/j.chemosphere.2009.07.059. Epub 2009 Aug 21.
The impact of non-ideal sorption on atrazine transport was investigated for two sandy porous media with 0.38% and 0.03% organic-carbon contents. In contrast to prior investigations, effluent atrazine concentrations were monitored over a range of five orders of magnitude to examine long-term elution behavior. As characterized by batch-experiments, atrazine experienced nonlinear sorption for both media. The results of the column experiments showed that atrazine exhibited extensive elution tailing (delayed approach to relative concentration of zero). This non-ideal transport was more pronounced for the medium with higher organic-carbon content. A mathematical model incorporating nonlinear, rate-limited sorption/desorption described by a continuous-distribution function was used to successfully simulate atrazine transport.
研究了两种有机碳含量分别为 0.38%和 0.03%的沙质多孔介质中非理想吸附对莠去津迁移的影响。与先前的研究不同，本研究在五个数量级范围内监测了出水中莠去津的浓度，以考察其长期洗脱行为。通过批实验表征，两种介质中的莠去津均表现出非线性吸附。柱实验结果表明，莠去津表现出广泛的洗脱滞后（相对浓度接近零的延迟接近）。对于有机碳含量较高的介质，这种非理想传输更为明显。一个包含非线性、速率限制吸附/解吸的数学模型，通过连续分布函数来描述，成功地模拟了莠去津的传输。
