Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 43, Issue 6, Pages 1852-1857Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es802966z
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Funding
- China Scholarship Council
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Microbial degradation is the most important removal process for hydrophobic organic compounds (HOCs) in soil or sediment and chemical availability is often a governing factor. However, the availability of HOCs in the sorbed forms is still a topic of debate. In this study, we applied rigorous kinetics analysis to the relationship between the freely dissolved concentration (C-free) of phenanthrene (PHE) measured by polydimethylsiloxane (PDMS) fibers and its degradation by a PAH degrading bacterium PYR-1 under a range of soil conditions. In solutions of soils with varying organic carbon (OC) contents, C-free of PHE decreased from 28.63 +/- 2.15 to 0.79 +/- 0.04 mu g L-1 when the soil OC content changed from 0.23 to 7.1%. Correlation analysis between C-free and PHE mineralization rates revealed that the bacterium quickly exhausted the PHE pool available for equilibrium distribution, including C-free and the reversibly sorbed fraction, after which the sequestered pool was utilized. In addition, unlike changes in Ghee, degradation rates of total PHE only varied by a factor of 1.6-2.1 over the same soil OC range. Regression analysis using a multivariate relationship showed that soil OC content and porosity properties such as soil surface area had a compounded effect on the microbial availability of PHE in these soils. The kinetics analysis using C-free, as proposed in this study, may be applied to other HOCs to gain a better understanding of microbial availability under various conditions.
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