Swindell Annika L, Reid Brian J
School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK.
Environ Pollut. 2006 Mar;140(1):79-86. doi: 10.1016/j.envpol.2005.06.022. Epub 2005 Sep 1.
The aim of this study was to investigate the influence of diesel on the loss and bioavailability of soil-associated [14C]phenanthrene with time. In addition, the temporal development of phenanthrene catabolic activity and the impact of co-contaminant mixtures on the soil microflora were also assessed. With respect to compound fate, the results suggested that competitive effects between dissimilar co-contaminants did influence [14C]phenanthrene loss. Where diesel was present at a concentration of 0, 20, 200 and 2000 mg kg(-1), increased phenanthrene loss was observed with increasing diesel concentrations. In the 20,000 mg kg(-1) diesel treatment, however, a significantly higher amount of the initial [14C]activity remained after 225 days. Furthermore, initial degradation of phenanthrene in this treatment was retarded as a result of repressed phenanthrene catabolic activity. These results were complemented by a 4-fold increase in total culturable bacterial cell numbers in the 20,000 mg kg(-1) treatment when compared with the 2000 mg kg(-1) after 225 days of incubation time.
本研究的目的是调查柴油对土壤中[14C]菲随时间的损失和生物有效性的影响。此外，还评估了菲分解代谢活性的时间发展以及共污染物混合物对土壤微生物区系的影响。关于化合物的归宿，结果表明不同共污染物之间的竞争效应确实影响了[14C]菲的损失。当柴油浓度为0、20、200和2000 mg kg(-1)时，随着柴油浓度的增加，菲的损失也增加。然而，在20000 mg kg(-1)柴油处理中，225天后仍有显著更高的初始[14C]活性。此外，由于菲分解代谢活性受到抑制，该处理中菲的初始降解受到阻碍。与2000 mg kg(-1)处理相比，在225天的培养时间后，20000 mg kg(-1)处理中可培养细菌总数增加了4倍，这补充了上述结果。
