Cargando…

Selective Sorption of Dissolved Organic Carbon Compounds by Temperate Soils

BACKGROUND: Physico-chemical sorption onto soil minerals is one of the major processes of dissolved organic carbon (OC) stabilization in deeper soils. The interaction of DOC on soil solids is related to the reactivity of soil minerals, the chemistry of sorbate functional groups, and the stability of...

Descripción completa

Detalles Bibliográficos
Autores principales: Jagadamma, Sindhu, Mayes, Melanie A., Phillips, Jana R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3507686/
https://www.ncbi.nlm.nih.gov/pubmed/23209742
http://dx.doi.org/10.1371/journal.pone.0050434
_version_ 1782251109400707072
author Jagadamma, Sindhu
Mayes, Melanie A.
Phillips, Jana R.
author_facet Jagadamma, Sindhu
Mayes, Melanie A.
Phillips, Jana R.
author_sort Jagadamma, Sindhu
collection PubMed
description BACKGROUND: Physico-chemical sorption onto soil minerals is one of the major processes of dissolved organic carbon (OC) stabilization in deeper soils. The interaction of DOC on soil solids is related to the reactivity of soil minerals, the chemistry of sorbate functional groups, and the stability of sorbate to microbial degradation. This study was conducted to examine the sorption of diverse OC compounds (D-glucose, L-alanine, oxalic acid, salicylic acid, and sinapyl alcohol) on temperate climate soil orders (Mollisols, Ultisols and Alfisols). METHODOLOGY: Equilibrium batch experiments were conducted using 0–100 mg C L(−1) at a solid-solution ratio of 1∶60 for 48 hrs on natural soils and on soils sterilized by γ-irradiation. The maximum sorption capacity, Q(max) and binding coefficient, k were calculated by fitting to the Langmuir model. RESULTS: Ultisols appeared to sorb more glucose, alanine, and salicylic acid than did Alfisols or Mollisols and the isotherms followed a non-linear pattern (higher k). Sterile experiments revealed that glucose and alanine were both readily degraded and/or incorporated into microbial biomass because the observed Q(max) under sterile conditions decreased by 22–46% for glucose and 17–77% for alanine as compared to non-sterile conditions. Mollisols, in contrast, more readily reacted with oxalic acid (Q(max) of 886 mg kg(−1)) and sinapyl alcohol (Q(max) of 2031 mg kg(−1)), and no degradation was observed. The reactivity of Alfisols to DOC was intermediate to that of Ultisols and Mollisols, and degradation followed similar patterns as for Ultisols. CONCLUSION: This study demonstrated that three common temperate soil orders experienced differential sorption and degradation of simple OC compounds, indicating that sorbate chemistry plays a significant role in the sorptive stabilization of DOC.
format Online
Article
Text
id pubmed-3507686
institution National Center for Biotechnology Information
language English
publishDate 2012
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-35076862012-12-03 Selective Sorption of Dissolved Organic Carbon Compounds by Temperate Soils Jagadamma, Sindhu Mayes, Melanie A. Phillips, Jana R. PLoS One Research Article BACKGROUND: Physico-chemical sorption onto soil minerals is one of the major processes of dissolved organic carbon (OC) stabilization in deeper soils. The interaction of DOC on soil solids is related to the reactivity of soil minerals, the chemistry of sorbate functional groups, and the stability of sorbate to microbial degradation. This study was conducted to examine the sorption of diverse OC compounds (D-glucose, L-alanine, oxalic acid, salicylic acid, and sinapyl alcohol) on temperate climate soil orders (Mollisols, Ultisols and Alfisols). METHODOLOGY: Equilibrium batch experiments were conducted using 0–100 mg C L(−1) at a solid-solution ratio of 1∶60 for 48 hrs on natural soils and on soils sterilized by γ-irradiation. The maximum sorption capacity, Q(max) and binding coefficient, k were calculated by fitting to the Langmuir model. RESULTS: Ultisols appeared to sorb more glucose, alanine, and salicylic acid than did Alfisols or Mollisols and the isotherms followed a non-linear pattern (higher k). Sterile experiments revealed that glucose and alanine were both readily degraded and/or incorporated into microbial biomass because the observed Q(max) under sterile conditions decreased by 22–46% for glucose and 17–77% for alanine as compared to non-sterile conditions. Mollisols, in contrast, more readily reacted with oxalic acid (Q(max) of 886 mg kg(−1)) and sinapyl alcohol (Q(max) of 2031 mg kg(−1)), and no degradation was observed. The reactivity of Alfisols to DOC was intermediate to that of Ultisols and Mollisols, and degradation followed similar patterns as for Ultisols. CONCLUSION: This study demonstrated that three common temperate soil orders experienced differential sorption and degradation of simple OC compounds, indicating that sorbate chemistry plays a significant role in the sorptive stabilization of DOC. Public Library of Science 2012-11-27 /pmc/articles/PMC3507686/ /pubmed/23209742 http://dx.doi.org/10.1371/journal.pone.0050434 Text en https://creativecommons.org/publicdomain/zero/1.0/ This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.
spellingShingle Research Article
Jagadamma, Sindhu
Mayes, Melanie A.
Phillips, Jana R.
Selective Sorption of Dissolved Organic Carbon Compounds by Temperate Soils
title Selective Sorption of Dissolved Organic Carbon Compounds by Temperate Soils
title_full Selective Sorption of Dissolved Organic Carbon Compounds by Temperate Soils
title_fullStr Selective Sorption of Dissolved Organic Carbon Compounds by Temperate Soils
title_full_unstemmed Selective Sorption of Dissolved Organic Carbon Compounds by Temperate Soils
title_short Selective Sorption of Dissolved Organic Carbon Compounds by Temperate Soils
title_sort selective sorption of dissolved organic carbon compounds by temperate soils
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3507686/
https://www.ncbi.nlm.nih.gov/pubmed/23209742
http://dx.doi.org/10.1371/journal.pone.0050434
work_keys_str_mv AT jagadammasindhu selectivesorptionofdissolvedorganiccarboncompoundsbytemperatesoils
AT mayesmelaniea selectivesorptionofdissolvedorganiccarboncompoundsbytemperatesoils
AT phillipsjanar selectivesorptionofdissolvedorganiccarboncompoundsbytemperatesoils