Coupled stream-subsurface exchange of colloidal hematite and dissolved zinc, copper, and phosphate.

摘要: Previous studies have shown that stream-subsurface exchange has important implications for both colloid and reactive solute transport in streams because it increases the opportunity interaction of stream-born substances with bed sediments. We executed a series laboratory flume experiments to study coupled hematite sorbing solutes zinc, copper, phosphate. A fundamental process-based model was applied analyze experimental results. found had significant effect on all ions tested. In addition, mobility substantially modified by presence these solutes. Batch column showed difference direct phosphate sorption surface. Sorption surface charge subsequently filtration behavior. These results suggest behavior contaminants cannot be analyzed separately from colloids groundwater systems surface-chemical processes can cause their coupled. particular, our show general specific interactions between iron oxide particles alter mobility, perturb natural fine particle dynamics, either favor or disfavor contaminant mobility.