Sorption of organic carbon compounds to the fine fraction of surface and subsurface soils

S. Jagadamma; M. A. Mayes; Y. L. Zinn; G. Gísladóttir; A. E. Russell

doi:10.1016/j.geoderma.2013.07.030

Sorption of organic carbon compounds to the fine fraction of surface and subsurface soils

S. Jagadamma, M. A. Mayes, Y. L. Zinn, G. Gísladóttir, A. E. Russell

Ecosystem Processes

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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 100mgCL^-1 of ¹⁴C-labeled compounds for 8h. Sorption parameters (maximum sorption capacity, Q_max and binding coefficient, k) calculated by fitting sorption data to the Langmuir equation showed that Q_max of A and B horizons was very similar for all compounds. Both Q_max and k values were related to sorbate properties, with Q_max being lowest for glucose (20-500mgkg^-1), highest for stearic acid (20,000-200,000mgkg^-1), and intermediate for both cinnamic acid (200-4000mgkg^-1) and starch (400-6000mgkg^-1). Simple linear regression analysis revealed that physico-chemical properties of the sorbents influenced the Q_max 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.

Original language	English
Pages (from-to)	79-86
Number of pages	8
Journal	Geoderma
Volume	213
DOIs	https://doi.org/10.1016/j.geoderma.2013.07.030
State	Published - Jan 2014

Funding

This research was funded in part by the Laboratory Directed Research and Development (LDRD) Program of the Oak Ridge National Laboratory (ORNL) and by the U.S. Department of Energy Biological and Environmental Research program . ORNL is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725 . We thank Stan Wullschleger, Anna Wagner, Julie Jastrow and Jana Phillips for providing soil samples, and Chad Covert and Daniel Wade for help with laboratory analyses. Collection and processing of soil samples from Brazil was supported by CNPq ( Proj. 474045/2010-2 ). The Costa Rican soils were collected as part of work supported by US National Science Foundation Grants DEB 0236502 and 0703561 . We would also like to thank Prasesh Sharma of ORNL for providing useful comments on the manuscript.

Keywords

Cinnamic acid
Dissolved organic carbon
Glucose
Sorption
Starch
Stearic acid

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10.1016/j.geoderma.2013.07.030

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title = "Sorption of organic carbon compounds to the fine fraction of surface and subsurface soils",

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 100mgCL-1 of 14C-labeled compounds for 8h. 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 (20-500mgkg-1), highest for stearic acid (20,000-200,000mgkg-1), and intermediate for both cinnamic acid (200-4000mgkg-1) and starch (400-6000mgkg-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.",

keywords = "Cinnamic acid, Dissolved organic carbon, Glucose, Sorption, Starch, Stearic acid",

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year = "2014",

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doi = "10.1016/j.geoderma.2013.07.030",

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AU - Jagadamma, S.

AU - Mayes, M. A.

AU - Zinn, Y. L.

AU - Gísladóttir, G.

AU - Russell, A. E.

PY - 2014/1

Y1 - 2014/1

N2 - 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 100mgCL-1 of 14C-labeled compounds for 8h. 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 (20-500mgkg-1), highest for stearic acid (20,000-200,000mgkg-1), and intermediate for both cinnamic acid (200-4000mgkg-1) and starch (400-6000mgkg-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.

AB - 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 100mgCL-1 of 14C-labeled compounds for 8h. 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 (20-500mgkg-1), highest for stearic acid (20,000-200,000mgkg-1), and intermediate for both cinnamic acid (200-4000mgkg-1) and starch (400-6000mgkg-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.

KW - Cinnamic acid

KW - Dissolved organic carbon

KW - Glucose

KW - Sorption

KW - Starch

KW - Stearic acid

UR - https://www.scopus.com/pages/publications/84883417298

U2 - 10.1016/j.geoderma.2013.07.030

DO - 10.1016/j.geoderma.2013.07.030

M3 - Article

AN - SCOPUS:84883417298

SN - 0016-7061

VL - 213

SP - 79

EP - 86

JO - Geoderma

JF - Geoderma

ER -

Sorption of organic carbon compounds to the fine fraction of surface and subsurface soils

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Keywords

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