Transport and fractionation of dissolved organic matter in soil columns

Mingxin Guo, Jon Chorover

Research output: Contribution to journalArticle

113 Citations (Scopus)

Abstract

Dissolved organic matter (DOM) is a heterogeneous mixture of organic compounds that plays an important role in the movement of DOM-associated pollutants. In this study, transport and fractionation of DOM in soils was investigated in flow-through soil columns. Dissolved organic matter derived from spent mushroom substrate weathering was pumped through packed columns (2.5 cm × 10 cm) comprising a coarseloamy subsoil (mixed, semiactive, mesic Typic Hapludult), and effluents were monitored for changes in the composition of DOM. Effluent DOM was characterized for UV absorbance, molecular weight, acidity, and hydrophilicity. Transport through the columns resulted in preferential retention of specific DOM constituents as indicated by comparison with a Br- tracer. During the transport process, effluent DOM exhibited decreasing values of E2/E3 (from 10.3 to 6.2), acidity (from 20.8 to 13.1 mmolc g-1 C), and hydrophilicity (39.0 to 28.4%), and increasing values of molar absorptivity (from 164 to 310 L mol-1C cm-1) and number and weight-averaged molecular weight (from 1770 to 3150 and 2450 to 4180 Da, respectively). These results indicate that DOM fractions with higher molecular weight, higher molar absorptivity, lower E2/E3 ratio, lower acidity, and lower hydrophilicity were adsorbed preferentially by soil minerals, whereas the inverse fractions were transported preferentially. The adsorbed DOM could not be completely desorbed by DOM-free background solution, indicating a strongly bound fraction. Sorptive fractionation of DOM during transport likely affects the transport behavior of DOM-complexed constituents.

Original languageEnglish (US)
Pages (from-to)108-118
Number of pages11
JournalSoil Science
Volume168
Issue number2
DOIs
StatePublished - Feb 1 2003

Fingerprint

dissolved organic matter
soil column
fractionation
soil
effluents
acidity
effluent
molecular weight
spent mushroom compost
soil transport processes
mushroom
subsoil
organic compounds
weathering
absorbance
transport process
tracer techniques
organic compound
pollutants
tracer

Keywords

  • Acidity
  • Dissolved organic matter (DOM)
  • Fractionation
  • Hydrophilicity
  • Molar absorptivity
  • Molecular weight
  • Soil column
  • Transport

ASJC Scopus subject areas

  • Soil Science
  • Earth-Surface Processes

Cite this

Transport and fractionation of dissolved organic matter in soil columns. / Guo, Mingxin; Chorover, Jon.

In: Soil Science, Vol. 168, No. 2, 01.02.2003, p. 108-118.

Research output: Contribution to journalArticle

@article{f21694a865ae4c72a285fab03648ea17,
title = "Transport and fractionation of dissolved organic matter in soil columns",
abstract = "Dissolved organic matter (DOM) is a heterogeneous mixture of organic compounds that plays an important role in the movement of DOM-associated pollutants. In this study, transport and fractionation of DOM in soils was investigated in flow-through soil columns. Dissolved organic matter derived from spent mushroom substrate weathering was pumped through packed columns (2.5 cm × 10 cm) comprising a coarseloamy subsoil (mixed, semiactive, mesic Typic Hapludult), and effluents were monitored for changes in the composition of DOM. Effluent DOM was characterized for UV absorbance, molecular weight, acidity, and hydrophilicity. Transport through the columns resulted in preferential retention of specific DOM constituents as indicated by comparison with a Br- tracer. During the transport process, effluent DOM exhibited decreasing values of E2/E3 (from 10.3 to 6.2), acidity (from 20.8 to 13.1 mmolc g-1 C), and hydrophilicity (39.0 to 28.4{\%}), and increasing values of molar absorptivity (from 164 to 310 L mol-1C cm-1) and number and weight-averaged molecular weight (from 1770 to 3150 and 2450 to 4180 Da, respectively). These results indicate that DOM fractions with higher molecular weight, higher molar absorptivity, lower E2/E3 ratio, lower acidity, and lower hydrophilicity were adsorbed preferentially by soil minerals, whereas the inverse fractions were transported preferentially. The adsorbed DOM could not be completely desorbed by DOM-free background solution, indicating a strongly bound fraction. Sorptive fractionation of DOM during transport likely affects the transport behavior of DOM-complexed constituents.",
keywords = "Acidity, Dissolved organic matter (DOM), Fractionation, Hydrophilicity, Molar absorptivity, Molecular weight, Soil column, Transport",
author = "Mingxin Guo and Jon Chorover",
year = "2003",
month = "2",
day = "1",
doi = "10.1097/00010694-200302000-00005",
language = "English (US)",
volume = "168",
pages = "108--118",
journal = "Soil Science",
issn = "0038-075X",
publisher = "Lippincott Williams and Wilkins",
number = "2",

}

TY - JOUR

T1 - Transport and fractionation of dissolved organic matter in soil columns

AU - Guo, Mingxin

AU - Chorover, Jon

PY - 2003/2/1

Y1 - 2003/2/1

N2 - Dissolved organic matter (DOM) is a heterogeneous mixture of organic compounds that plays an important role in the movement of DOM-associated pollutants. In this study, transport and fractionation of DOM in soils was investigated in flow-through soil columns. Dissolved organic matter derived from spent mushroom substrate weathering was pumped through packed columns (2.5 cm × 10 cm) comprising a coarseloamy subsoil (mixed, semiactive, mesic Typic Hapludult), and effluents were monitored for changes in the composition of DOM. Effluent DOM was characterized for UV absorbance, molecular weight, acidity, and hydrophilicity. Transport through the columns resulted in preferential retention of specific DOM constituents as indicated by comparison with a Br- tracer. During the transport process, effluent DOM exhibited decreasing values of E2/E3 (from 10.3 to 6.2), acidity (from 20.8 to 13.1 mmolc g-1 C), and hydrophilicity (39.0 to 28.4%), and increasing values of molar absorptivity (from 164 to 310 L mol-1C cm-1) and number and weight-averaged molecular weight (from 1770 to 3150 and 2450 to 4180 Da, respectively). These results indicate that DOM fractions with higher molecular weight, higher molar absorptivity, lower E2/E3 ratio, lower acidity, and lower hydrophilicity were adsorbed preferentially by soil minerals, whereas the inverse fractions were transported preferentially. The adsorbed DOM could not be completely desorbed by DOM-free background solution, indicating a strongly bound fraction. Sorptive fractionation of DOM during transport likely affects the transport behavior of DOM-complexed constituents.

AB - Dissolved organic matter (DOM) is a heterogeneous mixture of organic compounds that plays an important role in the movement of DOM-associated pollutants. In this study, transport and fractionation of DOM in soils was investigated in flow-through soil columns. Dissolved organic matter derived from spent mushroom substrate weathering was pumped through packed columns (2.5 cm × 10 cm) comprising a coarseloamy subsoil (mixed, semiactive, mesic Typic Hapludult), and effluents were monitored for changes in the composition of DOM. Effluent DOM was characterized for UV absorbance, molecular weight, acidity, and hydrophilicity. Transport through the columns resulted in preferential retention of specific DOM constituents as indicated by comparison with a Br- tracer. During the transport process, effluent DOM exhibited decreasing values of E2/E3 (from 10.3 to 6.2), acidity (from 20.8 to 13.1 mmolc g-1 C), and hydrophilicity (39.0 to 28.4%), and increasing values of molar absorptivity (from 164 to 310 L mol-1C cm-1) and number and weight-averaged molecular weight (from 1770 to 3150 and 2450 to 4180 Da, respectively). These results indicate that DOM fractions with higher molecular weight, higher molar absorptivity, lower E2/E3 ratio, lower acidity, and lower hydrophilicity were adsorbed preferentially by soil minerals, whereas the inverse fractions were transported preferentially. The adsorbed DOM could not be completely desorbed by DOM-free background solution, indicating a strongly bound fraction. Sorptive fractionation of DOM during transport likely affects the transport behavior of DOM-complexed constituents.

KW - Acidity

KW - Dissolved organic matter (DOM)

KW - Fractionation

KW - Hydrophilicity

KW - Molar absorptivity

KW - Molecular weight

KW - Soil column

KW - Transport

UR - http://www.scopus.com/inward/record.url?scp=0037327167&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037327167&partnerID=8YFLogxK

U2 - 10.1097/00010694-200302000-00005

DO - 10.1097/00010694-200302000-00005

M3 - Article

AN - SCOPUS:0037327167

VL - 168

SP - 108

EP - 118

JO - Soil Science

JF - Soil Science

SN - 0038-075X

IS - 2

ER -