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Association of organic compounds to dissolved and particulate natural organic matter in soils

Frankki, Sofia (2006). Association of organic compounds to dissolved and particulate natural organic matter in soils. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2006:52
ISBN 91-576-7101-X
[Doctoral thesis]

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To make proper risk assessments of sites with contaminated soil it’s important to understand the biogeochemical processes determining transport and sequestration of the contaminants in soil. Soil organic matter (SOM) is the most important component in soil for adsorption of hydrophobic organic compounds (HOC) and the organic carbon normalized partitioning constant (KOC) is used to model partitioning of HOCs between the aqueous phase and SOM. The aqueous solubility of HOCs is low and association to dissolved organic matter (DOM) in soil solution is therefore important for the mobility of HOCs. Similarly, association to the solid phase of SOM, in this thesis denoted particulate organic matter (POM), controls the retention of HOCs in organic rich soils. Few data are reported on the partitioning of HOCs to DOM (KDOC) and to POM (KPOC) determined in the same equilibrium system. In short-term adsorption experiments with controlled equilibrium systems, adsorption to DOM and POM was best described by linear isotherms for chlorophenols (CPs) and nitrobenzene (NB), indicative of a hydrophobic partitioning mechanism. Adsorption of aniline was best described by the Langmuir isotherm, indicative of a specific interaction to functional groups of DOM and POM. Trinitrotoluene (TNT) adsorption data revealed specific interactions of degradation products to DOM and hydrophobic partitioning of TNT to POM. As a complement to the short-term adsorption experiments, soils with aged contaminants were investigated. Chlorophenols (CP), phenoxy phenols (PCPP), diphenyl ethers (PCDE), dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF) associated to DOM and POM and the free analyte in the aqueous phase were determined. In both the adsorption experiments and the soils with aged contaminants, POM showed a higher binding affinity towards HOCs than DOM, when normalized to organic carbon content. The partitioning towards POM, relative to DOM, increased with increasing hydrophobicity of the classes of compound studied in the order CP<PCDE<PCDF<PCDD. No major differences in carbon chemistry were revealed between DOM and POM (using 13C-NMR, XPS and elemental analysis), thus it is suggested that some other property is responsible for the difference in binding to POM and DOM. The physical size of hydrophobic structures could be such an important property.

Authors/Creators:Frankki, Sofia
Title:Association of organic compounds to dissolved and particulate natural organic matter in soils
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :May 2006
Number of Pages:43
ALLI. Eriksson, J., Frankki, S., Shchukarev, A. and Skyllberg, U. 2004 Binding of 2,4,6-trinitrotoluene, aniline and nitrobenzene to dissolved and particulate soil organic matter. Environmental Science & Technology, 38, 3074-3080 II. Frankki S. and Skyllberg U. 2006. Chlorophenol binding to dissolved and particulate soil organic matter determined in controlled equilibrium systems. European journal of soil science, (In press). III. Frankki, S., Persson, Y., Tysklind, M. and Skyllberg U. 2006. Partitioning of CPs, PCDEs and PCDD/Fs between dissolved and particulate natural organic matter in a contaminated soil. Submitted manuscript. IV. Frankki, S., Persson, Y., Shchukarev, A., Tysklind, M. and Skyllberg U. 2006. Partitioning of CP, PCPP PCDE and PCDD/F between dissolved and particulate soil organic matter at three industrial sites with chlorophenol preservative contamination. Submitted manuscript.
Place of Publication:Umeå
ISBN for printed version:91-576-7101-X
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:soil, soil organic matter, phenolic compounds, dioxins, adsorption, cycling, soil pollution
Keywords:organic matter, chlorophenols, TNT, dioxins, partitioning, adsorption, contaminant
Permanent URL:
ID Code:1132
Department:(S) > Institutionen för skogsekologi (930701-061231)
Deposited By: Sofia Frankki
Deposited On:22 May 2006 00:00
Metadata Last Modified:02 Dec 2014 10:09

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