Silica colloids as non-carriers facilitate Pb2+ transport in saturated porous media under a weak adsorption condition: effects of Pb2+ concentrations

Transport of Veterinary Antibiotics in Farmland Soil: Effects of Dissolved Organic Matter

“…Contaminant transport in soil occurs not only in dissolved form but also in association with moving colloids. This mechanism of contaminant migration has been reported for numerous contaminants in the literature, including heavy metals [22,140,141], pesticides [142,143], and pharmaceuticals [33,144,145]. Colloid-associated contaminants may migrate at a rate faster than the non-sorbing tracer [146], which contributes an essential pathway for rapid contaminant transport, especially for highly sorbing organic contaminants in natural soil and groundwater [22,34,[147][148][149].…”

Co-transport of ferrihydrite–organic matter colloids with Sb(v) in saturated porous media: implications for antimony mobility

“…68 Nevertheless, when the colloid concentration exceeds the critical concentration colloidal particles tend to cluster together and are more likely to get trapped in the narrow throat between quartz sand particles due to the increased probability of collision at high concentrations. 69–71 Taken together, the FH–HA colloid-facilitated Sb( v ) transport is attributed to Sb( v ) adsorption on FH–HA surfaces, which was largely affected by colloidal concentration or surface physical-chemistry properties.…”