Impacts of sampling dissolved organic matter with passive capillary wicks versus aqueous soil extraction

Julia N Perdrial, Nico Perdrial, Adrian Harpold, Xiaodong Gao, Rachel Gabor, Kelsie LaSharr, Jon Chorover

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Quantitative characterization of dissolved organic matter (DOM) in soil and vadose zone solution is needed to interpret mechanisms of nutrient and C cycling as well as bio-weathering processes. Passive capillary wick samplers (PCaps) are useful for soil solution sampling because they can provide measures of water and associated DOM-constituent flux in the unsaturated zone, however potential impacts of the wick material on DOM chemical properties has not been investigated yet. We therefore conducted experiments where aqueous soil extracts were transported along PCap fiberglass wicks in flow-through experiments. Results indicated limited dissolved organic carbon (DOC) sorption and DOM fractionation, and related parameters (total dissolved nitrogen [TDN], DOM fluorescence components) also remained largely unaffected. We note that this experiment does not account for the extent to which soil hydrologic processes may be affected by PCap field installations. However, given that the wicks did not fractionate significantly DOM, we compared field-based PCap DOM solution collected in situ with laboratory-based aqueous soil extraction (ASE) of DOM from the same soils to assess differences in DOM quality. Spectroscopic analysis of DOM in ASE solutions showed lower O-H stretch/carboxlyate band intensity ratios, more pronounced aliphatic C-H stretching (Fourier Transform Infrared analysis), higher specific ultraviolet-absorbance (SUVA(254)) values as well as greater abundance of fluorescence components in the region attributed to fulvic acids. We conclude that difference in molecular properties of DOM derived from laboratory ASE vs. PCap field collection of the same soils is attributable to differential disturbance effects of the two methods of soil solution collection.

Original languageEnglish
Pages (from-to)2019-2030
Number of pages12
JournalSoil Science Society of America Journal
Volume76
Issue number6
DOIs
Publication statusPublished - 5 Oct 2012

Keywords

  • pore-water samplers
  • mineral surfaces
  • fiberglass wicks
  • suction cups
  • vadose zone
  • fluorescence
  • sorption
  • carbon
  • goethite
  • solute

Cite this

Perdrial, J. N., Perdrial, N., Harpold, A., Gao, X., Gabor, R., LaSharr, K., & Chorover, J. (2012). Impacts of sampling dissolved organic matter with passive capillary wicks versus aqueous soil extraction. Soil Science Society of America Journal, 76(6), 2019-2030. https://doi.org/10.2136/sssaj2012.0061

Impacts of sampling dissolved organic matter with passive capillary wicks versus aqueous soil extraction. / Perdrial, Julia N; Perdrial, Nico; Harpold, Adrian; Gao, Xiaodong; Gabor, Rachel; LaSharr, Kelsie; Chorover, Jon.

In: Soil Science Society of America Journal, Vol. 76, No. 6, 05.10.2012, p. 2019-2030.

Research output: Contribution to journalArticle

Perdrial, JN, Perdrial, N, Harpold, A, Gao, X, Gabor, R, LaSharr, K & Chorover, J 2012, 'Impacts of sampling dissolved organic matter with passive capillary wicks versus aqueous soil extraction', Soil Science Society of America Journal, vol. 76, no. 6, pp. 2019-2030. https://doi.org/10.2136/sssaj2012.0061
Perdrial, Julia N ; Perdrial, Nico ; Harpold, Adrian ; Gao, Xiaodong ; Gabor, Rachel ; LaSharr, Kelsie ; Chorover, Jon. / Impacts of sampling dissolved organic matter with passive capillary wicks versus aqueous soil extraction. In: Soil Science Society of America Journal. 2012 ; Vol. 76, No. 6. pp. 2019-2030.
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