Aniline and 2,4,6-trinitrotoluene associate preferentially to low molecular weight fractions of dissolved soil organic matter |
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Authors: | Johan Eriksson Ulf Skyllberg |
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Affiliation: | aDepartment of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE 901 83 Umeå, Sweden;bDivision of NBC-protection, Swedish Defence Research Agency (FOI), SE 901 82 Umeå, Sweden |
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Abstract: | Aniline and 2,4,6-trinitrotoluene (TNT) were equilibrated with particulate (POM) and dissolved organic matter (DOM) from an organic soil at different compositions of adsorbed major cations (Na, Al) and pH (aniline: 3.7–5.1, TNT: 4.8–5.0). After separation of POM, concentrations of 14C-labelled aniline and TNT* (including TNT degradation products) were determined in DOM size fractions using size-exclusion chromatography (SEC) and UV-detection. Concentrations in the <3.5 kDa size fraction were 2.8–6.0 and 8.5–9.5 times higher for aniline and TNT*, respectively, as compared to the >40 kDa fraction. Thus, both aniline and TNT* were preferentially associated to the smallest DOM size fraction. The significant binding to DOM (similar extent as to POM) and the fact that the <3.5 kDa DOM fraction was less susceptible to flocculation by major metals suggests that the mobility of aniline and TNT is highly affected by the solubility of soil organic matter. |
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Keywords: | Natural organic matter Dissolved organic matter Organic soil Molecular size fractions Aniline 2,4,6-Trinitrotoluene Size-exclusion chromatography |
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