Field tracer tests on the mobility of natural organic matter in a sandy aquifer

J. F. McCarthy, B. Gu, L. Liang, J. Mas-Pla, T. M. Williams, Tian-Chyi J Yeh

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

The field-scale transport of natural organic matter (NOM) was examined in a two-well forced gradient injection experiment in a sandy, coastal plain aquifer in Georgetown, South Carolina. Spatial moments described the migration of the center of mass of NOM and conservative tracer. Temporal moments were used to estimate mass loss and retardation of the NOM along a transect of six sampling locations at two depths and at the withdrawal well. Large differences were observed in transport behavior of different subcomponents of NOM. Larger and more strongly binding NOM components in the injection solution are postulated to adsorb and displace weakly binding, low-molecular weight NOM in groundwater. Conversely, NOM components that were similar to the groundwater NOM were transported almost conservatively, presumably due to 'passivation' of the aquifer by previously adsorbed components of the groundwater NOM. NOM may thus exhibit two types of effects on contaminant dynamics in the subsurface. When the equilibria between solution and solid phase NOM is disrupted by introduction of a novel source of NOM, descriptions of the multicomponent transport process are complex and predictive modeling is problematic. Because of the differences in transport behavior of NOM subcomponents, the chemical properties and, more importantly, the functional behavior of NOM with respect to contaminant migration will vary with time and distance along a flow path. However, when groundwater NOM exists at a steady state with respect to adsorption on aquifer surfaces, the migration of NOM, and the contaminant-NOM complex, may be approximated as the transport of a conservative solute.

Original languageEnglish (US)
Pages (from-to)1223-1238
Number of pages16
JournalWater Resources Research
Volume32
Issue number5
DOIs
StatePublished - May 1996

Fingerprint

Aquifers
Biological materials
aquifers
tracer techniques
tracer
organic matter
aquifer
testing
Groundwater
groundwater
test
Impurities
pollutant
injection
coastal plains
transport process
Passivation
coastal plain
Chemical properties
chemical property

ASJC Scopus subject areas

  • Aquatic Science
  • Environmental Science(all)
  • Environmental Chemistry
  • Water Science and Technology

Cite this

Field tracer tests on the mobility of natural organic matter in a sandy aquifer. / McCarthy, J. F.; Gu, B.; Liang, L.; Mas-Pla, J.; Williams, T. M.; Yeh, Tian-Chyi J.

In: Water Resources Research, Vol. 32, No. 5, 05.1996, p. 1223-1238.

Research output: Contribution to journalArticle

McCarthy, JF, Gu, B, Liang, L, Mas-Pla, J, Williams, TM & Yeh, T-CJ 1996, 'Field tracer tests on the mobility of natural organic matter in a sandy aquifer', Water Resources Research, vol. 32, no. 5, pp. 1223-1238. https://doi.org/10.1029/96WR00285
McCarthy, J. F. ; Gu, B. ; Liang, L. ; Mas-Pla, J. ; Williams, T. M. ; Yeh, Tian-Chyi J. / Field tracer tests on the mobility of natural organic matter in a sandy aquifer. In: Water Resources Research. 1996 ; Vol. 32, No. 5. pp. 1223-1238.
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