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研究者一直推测固体颗粒和吸附其上的污染物在多孔土壤和蓄水层中迁移缓慢，因而认为无长距离污染迁移的风险。但最近的研究提出可移动的胶态颗粒可能是污染物迁移的主要机理，因为其能强烈吸附污染物。D．Grolimund和其同事对此观点提供了实验依据。他们在实验室圆柱中模拟田
Researchers have speculated that solid particles and the pollutants adsorbed by them migrate slowly in porous soils and aquifers and therefore consider the risk of long-range pollution migration. However, recent studies suggest that movable colloidal particles may be the primary mechanism of pollutant migration because of its strong adsorption of contaminants. D. Grolimund and his colleagues provide experimental evidence of this view. They simulated fields in a laboratory cylinder