Characterization of the bottom sediments contaminated with polychlorinated biphenyls: Evaluation of ecotoxicity and biodegradability

At the locality of the former producer of PCBs Chemko Strážske in East Slovakia, a large amount of PCBs (the commercial mixture DELOR 103, an equivalent of AROCLOR 1242) is still persisting in sediments and negatively influences health of the population. The objective of this work was to provide a s...

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Veröffentlicht in:International biodeterioration & biodegradation 2009-06, Vol.63 (4), p.440-449
Hauptverfasser: Dercová, Katarína, Šeligová, Jana, Dudášová, Hana, Mikulášová, Mária, Šilhárová, Katarína, Tóthová, Lívia, Hucko, Pavel
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container_issue 4
container_start_page 440
container_title International biodeterioration & biodegradation
container_volume 63
creator Dercová, Katarína
Šeligová, Jana
Dudášová, Hana
Mikulášová, Mária
Šilhárová, Katarína
Tóthová, Lívia
Hucko, Pavel
description At the locality of the former producer of PCBs Chemko Strážske in East Slovakia, a large amount of PCBs (the commercial mixture DELOR 103, an equivalent of AROCLOR 1242) is still persisting in sediments and negatively influences health of the population. The objective of this work was to provide a study of ecotoxicity and genotoxicity of PCBs in contaminated sediments. Toxicity of the PCB-contaminated sediments sampled from Zemplínska šírava and Strážsky canal (surroundings of the former producer of PCBs) was determined applying a standard aquatic plant toxicity test using Lemna minor. The endpoints for the test were frond numbers and frond areas. The sediment sampled from Zemplínska šírava was more toxic to L. minor than the one sampled from Strážsky canal. The results on genotoxicity showed that both sediments were not mutagenic toward the standard strains of the Ames test, Salmonella typhimurium TA98 and TA100. This work deals also with biodegradation of PCBs in two samples of the above mentioned contaminated sediments: a) in the natural sediments by autochthonous microbial consortium and b) in the bioaugmented sediments inoculated by allochthonous bacterial strains, two bacterial isolates from long-term PCB-contaminated soil Pseudomonas stutzeri and Alcaligenes xylosoxidans. Both approaches were applied under the biostimulation conditions, with addition of glucose or biphenyl as co-substrates, as well. The highest PCB degradation was observed in the bioaugmented sediment inoculated with bacterial strain P. stutzeri. Addition of biphenyl, as the co-substrate and the inducer, positively affected degradation of PCBs. The bphA1 gene, encoding enzyme biphenyldioxygenase, responsible for the start of PCB degradation, was identified in genome of P. stutzeri, a potential PCB-degrader isolated from long-term PCB-contaminated soil, but not in genome of A. xylosoxidans.
doi_str_mv 10.1016/j.ibiod.2008.12.005
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1879-0208
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source Elsevier ScienceDirect Journals Complete
subjects Alcaligenes xylosoxidans
Biodegradation
bphA1 gene
Ecotoxicity
Lemna minor
Polychlorinated biphenyls
Pseudomonas stutzeri
Salmonella typhimurium
Sediments
title Characterization of the bottom sediments contaminated with polychlorinated biphenyls: Evaluation of ecotoxicity and biodegradability
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