Abstract
During microbial degradation of polychlorinated biphenyls (PCB) in liquid media two processes take place simultaneously: elimination of PCB and evaporation of PCB. The physical loss of PCB due to evaporation causes frequently false positive results in long-term biodegradation experiments. Therefore, if only the PCB concentration is to be measured, its determination in both liquid and gaseous phase is essential for a correct appraisal of biodegradation. The kinetics of PCB evaporation have been monitored and the evaporation rate constants for individual PCB congeners have been determined. The values of evaporation rate constants show a good corelation with the values of the 1-octanol/water partition coefficient.
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