Assessing the Reactive Surface Area of Soils and the Association of Soil Organic Carbon with Natural Oxide Nanoparticles Using Ferrihydrite as Proxy
Juan C. Méndez, Tjisse Hiemstra, G.F. Koopmans
Abstract
/g, illustrating that this property is highly variable and cannot be represented by a single value based on the AO-extractable oxide content. The soil organic carbon (SOC) content of our top soils increases linearly not only with the increase in RSA but remarkably also with the increase in mean particle size (1.5-5 nm). To explain these observations, we present a structural model for organo-mineral associations based on the coordination of SOC particles to metal-(hydr)oxide cores.
Topics & Concepts
FerrihydriteAmmonium oxalateGoethiteAdsorptionSoil waterChemistryOxideCation-exchange capacityIron oxideInorganic chemistryOxalateSoil testEnvironmental chemistrySoil scienceEnvironmental scienceOrganic chemistryIron oxide chemistry and applicationsArsenic contamination and mitigationClay minerals and soil interactions