Monitoring bioremediation in creosote-contaminated soils using chemical analysis and toxicity tests |
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| Authors: | T M Phillips D Liu A G Seech H Lee J T Trevors |
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| Institution: | (1) Department of Environmental Biology, University of Guelph, Guelph, ON, Canada N1G 2W1, CA;(2) Canada Centre for Inland Waters, Burlington, ON, Canada L7R 4A6, CA;(3) GRACE Bioremediation Technologies, Mississauga, ON, Canada L5C 4P9, CA |
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| Abstract: | Three soils with a history of creosote contamination (designated NB, TI and AC) were treated in bench-scale microcosms using
conditions (nutrient amendment, moisture content and temperature) which had promoted mineralization of 14C-pyrene in a preliminary study. Bioremediation was monitored using the solid-phase Microtox test, seed germination and earthworm
survival assays, SOS-chromotest, Toxi-chromotest and a red blood cell (RBC) haemolysis assay. Contaminant concentrations in
the AC soil did not change after 150 days. Polycyclic aromatic hydrocarbon (PAH) concentrations decreased in the NB soil,
and toxicity decreased overall according to the earthworm, seed germination and Microtox tests. Although total petroleum hydrocarbons
(TPHs) in the TI soil were reduced following treatment, results of the earthworm, seed germination, RBC and Microtox tests
suggested an initial increase in toxicity indicating that toxic intermediary metabolites may have formed during biodegradation.
Toxicity testing results did not always correlate with contaminant concentrations, nor were the trends indicated by each test
consistent for any one soil. Each test demonstrated a different capacity to detect reductions in soil contamination. Journal of Industrial Microbiology & Biotechnology (2000) 24, 132–139.
Received 14 June 1999/ Accepted in revised form 12 November 1999 |
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| Keywords: | : bioremediation creosote microbiology soil contamination soil toxicity |
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