2019
DOI: 10.1016/j.chemosphere.2019.06.071
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Sorption of phosphate and silicate alters dissolution kinetics of poorly crystalline iron (oxyhydr)oxide

Abstract: Iron (oxyhydr)oxides (FeOx) control retention of dissolved nutrients and contaminants in aquatic systems. However, FeOx structure and reactivity is dependent on adsorption and incorporation of such dissolved species, particularly oxyanions such as phosphate and silicate. These interactions affect the fate of nutrients and metal(loids), especially in perturbed aquatic environments such as eutrophic coastal systems and environments impacted by acid mine drainage. Altered FeOx reactivity impacts sedimentary nutri… Show more

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Cited by 31 publications
(96 citation statements)
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“…By binding to FeOx surfaces, P and other strongly sorbing inorganic and organic species can passivate the particle surface and decrease the rate of FeOx transformation. 4,6,43,44 However, we note that adsorbed species (P and organic carbon) were not determined in the current study.…”
Section: ■ Results and Discussionmentioning
confidence: 64%
“…By binding to FeOx surfaces, P and other strongly sorbing inorganic and organic species can passivate the particle surface and decrease the rate of FeOx transformation. 4,6,43,44 However, we note that adsorbed species (P and organic carbon) were not determined in the current study.…”
Section: ■ Results and Discussionmentioning
confidence: 64%
“…Although pure ferrihydrite is unstable and directly transforms to more stable phases such as goethite or hematite [2], many recent studies have proved that the admixtures present in ferrihydrite significantly inhibit its transformation [23,24]. In the presence of phosphate, the solubility of ferrihydrite decreases [25,26].…”
Section: Introductionmentioning
confidence: 99%
“…Although pure ferrihydrite is unstable and directly transforms to more stable phases such as goethite or hematite [ 2 ], many recent studies have proved that the admixtures present in ferrihydrite significantly inhibit its transformation [ 23 , 24 ]. In the presence of phosphate, the solubility of ferrihydrite decreases [ 25 , 26 ]. Consequently, the rate of ferrihydrite conversion is reduced [ 27 ] and the aggregation of colloidal iron oxide particles is observed [ 28 , 29 ] which leads to the preferred formation of hematite [ 27 , 30 ].…”
Section: Introductionmentioning
confidence: 99%
“…Thus, it is possible that the soil acidity may have contributed Effects of biotite syenite on the nutrient levels and electrical charges in a Brazilian Savanna Ferralsol to release P from the rock powder. A possible explanation for the slight decrease in the P levels at the highest dose of the biotite syenite might be the immobilization of P in iron oxihydroxides caused by the weathering of biotite syenite, resulting in iron oxidation (Kraal et al 2019). Additionally, the 1,200; 1,800; and 2,400 kg ha -1 doses presented a slightly lower Al content than that of the 600 kg ha -1 dose.…”
Section: Resultsmentioning
confidence: 96%