Linking desorption kinetics to phenanthrene biodegradation in soil.

Rhodes, Angela and McAllister, Laura E. and Semple, Kirk T. (2010) Linking desorption kinetics to phenanthrene biodegradation in soil. Environmental Pollution, 158 (5). pp. 1348-1353. ISSN 0269-7491

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The desorption of polycyclic aromatic hydrocarbons (PAHs) often exhibits a biphasic profile similar to that observed for biodegradation whereby an initial rapid phase of degradation or desorption is followed by a phase of much slower transformation or release. Most investigations to-date have utilised a polymeric sorbent, such as Tenax, to characterise desorption, which is methodologically unsuitable for the analysis of soil. In this study, desorption kinetics of 14C-phenanthrene were measured by consecutive extraction using aqueous solutions of hydroxypropyl-β-cyclodextrin (HPCD). The data indicate that the fraction extracted after 24 h generally approximated the linearly sorbed, rapidly desorbing fraction (Frap), calculated using a three-compartment model. A good linear correlation between phenanthrene mineralised and Frap was observed (r2 = 0.89; gradient = 0.85; intercept = 8.20). Hence HPCD extraction (24 h) and first-order three-compartment modelling appear to provide an operationally straightforward tool for estimating mass-transfer limited biodegradation in soil. Aqueous hydroxypropyl-β-cyclodextrin (HPCD) solutions can predict the rapidly desorbing and microbially degradable fractions of phenanthrene in soils.

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Journal Article
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Environmental Pollution
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08 Feb 2010 14:05
Last Modified:
21 Nov 2022 19:44