Transport of Mecoprop through Mercia Mudstone and Oxford Clay at the laboratory scale
Transport of Mecoprop through Mercia Mudstone and Oxford Clay at the laboratory scale
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在实验室规模下 Mecoprop 通过麦西亚泥岩和牛津粘土的运输
DOI：
10.1144/1470-9236/08-097
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发表时间：
2011
影响因子：
1.4
通讯作者：
Woodman N
中科院分区：
文献类型：
--
作者：
Woodman N
摘要进行了实验室柱测试以评估Mecoprop在麦西亚泥页岩粘土和牛津粘土中的迁移行为。固结粘土样品在三轴单元中压缩到代表填埋场底部的应力。实现了均匀的稳定流动，并且在一个或多个快速流管中没有“旁路”流动的证据。Mecoprop和溴化物穿透曲线的分析表明，传输特性是线性的（噪声内），没有不可逆吸附的证据。双重孔隙或动力学吸附过程的可能性没有最终消除。截断的时间矩允许估计Mecoprop的线性延迟因子，这被证明是一个下限。基于建模，Mecoprop在牛津粘土的阻滞因子估计为17.1，相比之下，在批量吸附试验中为65.4。Mercia泥岩中Mecoprop的平均阻滞因子为3.6，而批次吸附试验的值为10.0。这些数据证实，从吸附等温线计算的阻滞系数从分解样品批量实验大大高估了可能会观察到的延迟压实粘土衬垫，因此批量测试值应谨慎使用地下水风险评估。
AbstractLaboratory column tests have been carried out to assess the transport behaviour of Mecoprop in Mercia Mudstone clay and Oxford Clay. Artificially consolidated clay samples were compressed in a triaxial cell to stresses representative of those at the base of a landfill. Uniform steady flow was achieved, and there was no evidence of ‘bypass’ flow in one or more fast streamtubes. Analysis of Mecoprop and bromide breakthrough curves showed that the transport characteristics were linear (within noise), with no evidence of irreversible sorption. The possibility of dual-porosity or kinetic sorption processes was not conclusively eliminated. Truncated temporal moments allowed estimates of the linear retardation factor for Mecoprop, which were shown to be a lower bound. Based on modelling, the retardation factor of Mecoprop in Oxford Clay was estimated to be 17.1, compared with 65.4 in batch sorption tests. The mean retardation factor for Mecoprop in Mercia Mudstone was 3.6, whereas the value from batch sorption tests was 10.0. These data confirm that retardation factors calculated from sorption isotherms obtained from batch experiments on disaggregated samples substantially overestimate the retardation likely to be observed in compacted clay liners; therefore values from batch tests should be used with caution in groundwater risk assessments.
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DOI：
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