2017
DOI: 10.1021/acs.est.7b02356
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Formation, Aggregation, and Deposition Dynamics of NOM-Iron Colloids at Anoxic–Oxic Interfaces

Abstract: The important role of natural organic matter (NOM)-Fe colloids in influencing contaminant transport, and this role can be influenced by the formation, aggregation, and particle deposition dynamics of NOM-Fe colloids. In this work, NOM-Fe colloids at different C/Fe ratios were prepared by mixing different concentrations of humic acid (HA) with 10 mg/L Fe(II) under anoxic conditions. The colloids were characterized by an array of techniques and their aggregation and deposition behaviors were examined under both … Show more

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Cited by 108 publications
(129 citation statements)
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“…Similar differences between Ca 2þ and Mg 2þ have also been reported, e.g. for the aggregation of humic acid-Fe colloids and citrate-coated gold nanoparticles (Liao et al 2017;Liu et al 2013). Considering the levels of total calcium and magnesium in soil solution amount up to ,5 mM and ,1 mM , respectively, higher magnesium to calcium ratios are expected to result in an enhanced dispersion and thus in an increased mobility of NOM.…”
Section: Environmental Implicationsupporting
confidence: 75%
“…Similar differences between Ca 2þ and Mg 2þ have also been reported, e.g. for the aggregation of humic acid-Fe colloids and citrate-coated gold nanoparticles (Liao et al 2017;Liu et al 2013). Considering the levels of total calcium and magnesium in soil solution amount up to ,5 mM and ,1 mM , respectively, higher magnesium to calcium ratios are expected to result in an enhanced dispersion and thus in an increased mobility of NOM.…”
Section: Environmental Implicationsupporting
confidence: 75%
“…This is interesting because strain SW2 was proposed to oxidize Fe(II) intracellularly with a putative iron oxidase FoxE embedded in the periplasm of the cell (43,45). The observed oxidation of large Fe(II)-OM complexes, such as the Fe(II)-PPHA and Fe(II)-SRFA complexes, which were determined to be in the colloidal size range (46), suggests that strain SW2 may also be able to oxidize Fe(II) extracellularly, similar to many other bacteria with enzymatic Fe(II) oxidation pathways (47), since the large Fe(II)-PPHA and Fe(II)-SRFA complexes may not be easily transported into the periplasm.…”
Section: Discussionmentioning
confidence: 93%
“…These trends are facilitated by ubiquitous interactions with organic matter that serve as a bridge between mineral particles and produce thin coatings on mineral surfaces in both the dissolved and particulate phases (Baas Becking et al 1960;Hunter and Liss 1979;Filella et al 1993;Turner 1995;Buffle et al 1998;Mosley et al 2003;Doucet et al 2007;Filella 2007;Aiken et al 2011;Philippe and Schaumann 2014;Peijnenburg et al 2015;Louie et al 2016). These "macromolecular coronas" are especially prevalent at anoxicoxic interfaces, and they can help to stabilize dissolved Fe oxyhydroxide nanoparticles in the water column by producing a uniformly negative charge on particle surfaces (Lynch et al 2014;Liao et al 2017). These coatings may also induce sedimentation by creating aggregates or may create larger mixed organic-inorganic particles that fall into the particulate phase (i.e., >0.45 m).…”
Section: Colloids and Colloidal Systemsmentioning
confidence: 99%