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Degradation rates of aged petroleum hydrocarbons are likely to be mass transfer dependent in the field

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dc.contributor.author Björklöf, Katarina
dc.contributor.author Salminen, Jani
dc.contributor.author Sainio, Pirjo
dc.contributor.author Jørgensen, Kirsten
dc.date.accessioned 2009-10-13T10:15:34Z
dc.date.available 2009-10-13T10:15:34Z
dc.date.issued 2008
dc.identifier.citation Environmental Geochemistry and Health (2008) 30:101-107 en
dc.identifier.issn 0269-4042
dc.identifier.uri http://hdl.handle.net/10138/14155
dc.description.abstract Evidence for on site biodegradation may be difficult to provide at heterogeneous sites without additional experiments in controlled laboratory conditions. In this study, microbial activities measured as CO2 and CH4 production were compared in situ, in intact soil cores and in bottle microcosms containing sieved soils. In addition, biodegradation rates were determined by measuring the decrease in petroleum hydrocarbon concentrations at 7°C in aerobic and anaerobic conditions. Elevated concentrations of CO2 and CH4 in the soil gas phase indicated that both the aerobic and anaerobic microbial activity potentials were high at the contaminated site. Aerobic and anaerobic microbial degradation rates in laboratory experiments of petroleum hydrocarbons were highest in soils from the most contaminated point and degradation in the aerobic and anaerobic microcosms was linear throughout the incubation, indicating mass-transfer-dependent degradation. Different results for microbial activity measurements were obtained in laboratory studies depending on pretreatment and size of the sample, even when the environmental conditions were mimicked. These differences may be related to differences in the gas exchange rates as well as in changes in the bioavailability of the contaminant in different analyses. When predicting by modeling the behavior of an aged contaminant it is relevant to adapt the models in use to correspond to conditions relevant at the contaminated sites. The variables used in the models should be based on data from the site and on experiments performed using the original aged contaminant without any additions. en
dc.language.iso en en
dc.title Degradation rates of aged petroleum hydrocarbons are likely to be mass transfer dependent in the field en
dc.type Artikkeli en
dc.subject.ysa maaperä en
dc.subject.ysa öljy en
dc.subject.ysa hiilivedyt en
dc.subject.ysa biohajoaminen en
dc.subject.ysa dynamiikka en
dc.subject.ysa mikrobit en
dc.subject.ysa mikro-organismit en

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