Polycyclic aromatic hydrocarbon biodegradation rates: a structure-based study.

摘要: This study was designed to examine the role of molecular structure in determining biodegradation rates polycyclic aromatic hydrocarbons (PAHs). Laboratory experiments were performed aqueous systems, and data analyzed a manner that allowed determination first-order independent bioavailability limitations from physical-chemical processes. An aerobic mixed culture used, which had been enriched on broad range PAHs. The 22 PAHs included this ranged size two four rings compounds with 5-carbon alkyl substituents. observed only 1 order magnitude, is much less than typically field. supports findings other types studies, conclude most variation environmental PAH comes processes controlling not uptake or biotransformation. Rate differences attributable either presence ring an substituent alpha position. Various descriptors might be expected correlate rate-limiting steps process used attemptto develop quantitative structure-activity relationship for rates. No significant correlations found, but rate limitation interactions relevant enzymes remains possibility.