“…Many known environmental pollutants can attach to and move with colloids, a process referred to as colloid-facilitated transport, which has been identified as one of the most important mechanisms responsible for the mobilization of reactive heavy metals in soils (Barton & Karathanasis, 2003;Gao et al, 2011;Grolimund & Borkovec, 2005;Kretzschmar & Schafer, 2005). Other contaminants transported by colloidfacilitated transport include radionuclides from mines (Artinger et al, 2002;Malkovsky et al, 2015;Severino, Cvetkovic, & Coppola, 2007), heavy metals (Chekli et al, 2016;Ouyang, Shinde, Mansell, & Harris, 1996), organic compounds such as pesticides and herbicides from agricultural land (Barton & Karathanasis, 2003), or excess nutrients such as phosphorous from farmland (de Jonge, Moldrup, Rubaek, Schelde, & Djurhuus, 2004). Biocolloids (i.e., colloidal-sized microbes and pathogens) and many of the pollutants transported with colloids listed above are known to pose a threat to public and environmental health (e.g., eutrophication from excess nutrients, poisoning by heavy metals, disease outbreaks from waterborne pathogens; Haygarth et al, 2006;Heathwaite, Haygarth, Matthews, Preedy, & Butler, 2005;Kouznetsov et al, 2007;Ren & Packman, 2005).…”