Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/37116
Title: Sorption of organic carbon compounds to the fine fraction of surface and subsurface soils
Keywords: Dissolved organic carbon
Sorption
Glucose
Starch
Cinnamic acid
Stearic acid
Issue Date: Jan-2014
Publisher: Elsevier
Citation: JAGADAMMA, S. et al. Sorption of organic carbon compounds to the fine fraction of surface and subsurface soils. Geoderma, [S.l.], v. 213, p. 79-86, Jan. 2014. DOI: 10.1016/j.geoderma.2013.07.030.
Abstract: Dissolved organic carbon (DOC) transported from the soil surface is stabilized in deeper soil profiles by physico-chemical sorption processes. However, it is unclear how different forms of organic carbon (OC) compounds common in soil organic matter interact with soil minerals in the surface (A) and subsurface (B) horizons. We added four compounds (glucose, starch, cinnamic acid and stearic acid) to the silt- and clay-sized fraction (fine fraction) of A and B horizons of eight soils from varying climates (3 temperate, 3 tropical, 1 arctic and 1 sub-arctic). Equilibrium batch experiments were conducted using 0 to 100 mg C L− 1 of 14C-labeled compounds for 8 h. Sorption parameters (maximum sorption capacity, Qmax and binding coefficient, k) calculated by fitting sorption data to the Langmuir equation showed that Qmax of A and B horizons was very similar for all compounds. Both Qmax and k values were related to sorbate properties, with Qmax being lowest for glucose (20–500 mg kg− 1), highest for stearic acid (20,000–200,000 mg kg− 1), and intermediate for both cinnamic acid (200–4000 mg kg− 1) and starch (400–6000 mg kg− 1). Simple linear regression analysis revealed that physico-chemical properties of the sorbents influenced the Qmax of cinnamic acid and stearic acid, but not glucose and starch. The sorbent properties did not show predictive ability for binding coefficient k. By using the fine fraction as sorbent, we found that the mineral fractions of A horizons are equally reactive as the B horizons irrespective of soil organic carbon content.
URI: https://www.sciencedirect.com/science/article/pii/S0016706113002747
http://repositorio.ufla.br/jspui/handle/1/37116
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