MEASUREMENT OF SORPTION ISOTHERMS WITH FLOW-THROUGH REACTORS
MEASUREMENT OF SORPTION ISOTHERMS WITH FLOW-THROUGH REACTORS
复制标题
DOI：
10.1021/es00009a025
复制
发表时间：
1995-09-01
影响因子：
11.4
通讯作者：
STICHER, H
中科院分区：
文献类型：
--
作者：
GROLIMUND, D;BORKOVEC, M;STICHER, H
描述了一种简单的流动反应器技术，用于测量土壤、碎石、含水层材料或泥炭等固体环境材料的吸附等温线。通过测定两个不同土壤样品在有效恒定pH条件下的铜吸附等温线，确定了该方法的适用性。实验结果与独立的间歇和柱状实验结果相比较具有较好的可比性。通过对一种土壤样品的吸附行为的研究，说明了流过技术的潜在优势。在批量实验中，土壤样品的吸附行为明显依赖于固体浓度(颗粒浓度效应)。这些结果与流通式反应器技术和独立柱实验的比较明确地证实，在这种情况下，固体浓度的影响是由于背景电解质溶液对土壤的预洗不足造成的，与间歇实验中的摇动过程无关。目前的结果表明，预吸附离子的不完全去除往往是吸附研究中的一个主要误差来源，在批处理实验中可能很难识别。
A simple flow-through reactor technique is described for measurements of sorption isotherms on solid environmental materials such as soils, crushed rocks, aquifer materials, or peat. The applicability of the method was established by determining copper sorption isotherms at effectively constant pH for two different soil samples. The experimental results compare favorably with independent batch and column studies. Potential advantages of the flow-through technique are exemplified by studying the sorption behavior of one soil sample that shows in batch experiments a pronounced dependence on the solid concentration (particle concentration effect). Comparison of these results with the flow-through reactor technique and independent column experiments confirms unequivocally that in this case the influence of the solid concentration is an artifact due to insufficient prewashing of the soil with the background electrolyte solution and has nothing to do with the shaking process in batch experiments. The present results indicate that incomplete removal of preadsorbed ions may often represent a major source of error in sorption studies and may be difficult to recognize in batch experiments.