2020
DOI: 10.3390/w12040980
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Sedimentation and Transport of Different Soil Colloids: Effects of Goethite and Humic Acid

Abstract: Soil colloids significantly facilitate the transport of contaminants; however, little is known about the effects of highly reactive iron oxide and the most representative organic matter on the transport of soil colloids with different physicochemical properties. This study investigated the effects of goethite (GT) and humic acid (HA) on the sedimentation and transport of soil colloids using settling and column experiments. The stability of soil colloids was found to be related to their properties and decreased… Show more

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Cited by 23 publications
(9 citation statements)
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“…These inputs are sustainable, environmentally friendly, economical fertilizers that can increase crop yield and effectively improve soil quality by increasing soil organic carbon sequestration. Moreover, dissolved organic matter (DOM) released from organic inputs can readily adsorb on clay minerals, Fe oxides, and the surface of nanoparticles; hence, they significantly alter the surface chemistry and retention–repulsion properties of the water–sand–nanoparticle system. Therefore, DOM is a crucial substance in soils and can regulate the transport of nanoparticle and colloids. ,, Furthermore, DOM from different sources exhibits complex composition and diversified characteristics. Our previous studies suggest that humification, size, and morphology of DOM or humic acid (HA) are essential for controlling the transport of ferrihydrite nanoparticles. ,, For plastics, HA improves the stability of MPs, while organic matter and Fe mineral colloids promote NPs agglomeration via bridging or neutralization. , The large particle size lead to low heteroaggregation rate of NPs with DOM, wherein 200 nm NPs show higher stability than 50 nm NPs .…”
Section: Introductionmentioning
confidence: 99%
“…These inputs are sustainable, environmentally friendly, economical fertilizers that can increase crop yield and effectively improve soil quality by increasing soil organic carbon sequestration. Moreover, dissolved organic matter (DOM) released from organic inputs can readily adsorb on clay minerals, Fe oxides, and the surface of nanoparticles; hence, they significantly alter the surface chemistry and retention–repulsion properties of the water–sand–nanoparticle system. Therefore, DOM is a crucial substance in soils and can regulate the transport of nanoparticle and colloids. ,, Furthermore, DOM from different sources exhibits complex composition and diversified characteristics. Our previous studies suggest that humification, size, and morphology of DOM or humic acid (HA) are essential for controlling the transport of ferrihydrite nanoparticles. ,, For plastics, HA improves the stability of MPs, while organic matter and Fe mineral colloids promote NPs agglomeration via bridging or neutralization. , The large particle size lead to low heteroaggregation rate of NPs with DOM, wherein 200 nm NPs show higher stability than 50 nm NPs .…”
Section: Introductionmentioning
confidence: 99%
“…In equation ( 5 ), London-van der Waals force is calculated as below 30 : where is the Hamaker constant which is expressed for particle-water–sand as follow 31 : …”
Section: Methodsmentioning
confidence: 99%
“…[18][19][20] Particularly, physicochemical properties of soil nanoparticles, including the size and chemical components, vary significantly among PBDE-contaminated sites. 21,22 It is expected that the extents to which soil nanoparticles enhance PBDE transport in groundwater will vary substantially at contaminated sites consisting of different geological settings. To date, no studies have been carried out to understand the significance of soil nanoparticles-facilitated transport of PBDEs in groundwater, as affected by the types of soil nanoparticles and the properties of the porous media.…”
Section: Introductionmentioning
confidence: 99%