Toxicity of Halifax Harbour Sediments: an Evaluation of the Microtox® Solid-Phase Test
| العنوان: | Toxicity of Halifax Harbour Sediments: an Evaluation of the Microtox® Solid-Phase Test |
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| المؤلفون: | Peter G. Wells, Nancy H. Cook |
| المصدر: | Water Quality Research Journal. 31:673-708 |
| بيانات النشر: | IWA Publishing, 1996. |
| سنة النشر: | 1996 |
| مصطلحات موضوعية: | biology, Photobacterium phosphoreum, Environmental chemistry, Outfall, Environmental science, Sediment, Bioassay, Sewage treatment, Photosynthetic bacteria, Contamination, Water pollution, biology.organism_classification, Water Science and Technology |
| الوصف: | Subtidal sediments were collected from 8 stations in Halifax Harbour, N.S., in July and August, 1992, to initiate a study of sediment toxicity and hazards near the proposed location of a sewage treatment plant and outfall. A set of 110 samples was evaluated. Interstitial water from aerobic surface (0--2cm) and anaerobic subsurface (2-4cm) sediments was analyzed by the Microtox{reg_sign} toxicity test protocol; the sediment particles were analyzed using the Microtox Solid Phase Test (SPT). Toxicity was expressed as 5, 15, and 30min-EC50`s for the interstitial samples, and 5min-EC50`s for the sediments, the endpoint being the inhibition of photoluminescence of Photobacterium phosphoreum. Interstitial water from surface and subsurface sediments from all stations was usually non-toxic, when compared to a phenol standard. The mean 5min-EC50 of surface sediments (n = 57) was 5,433mg/L; the mean 5min-EC50 of subsurface sediments (n = 50) was 804 mg/L. Toxicity thresholds were compared with NRC sediment reference materials and a selection of natural sediments; then ranked based on criteria suggested by Environment Canada. Intra- and inter-sample variability in toxicity at different locations in relation to time, sediment depth, sediment properties, types and concentrations of contaminants, was evaluated by multivariate and PCA techniques. An experiment with marinemore » reference sediments (certified for PAHs and trace metals) and their mixtures showed the ability of the STP to discriminate between different levels of contaminated sediments, i.e. a dose-response relationship was demonstrated. This laboratory-field study provided insights into the sensitivity, reproducibility, significance and discriminatory ability of the Microtox{reg_sign} SPT, characteristics necessary for its deployment in a tiered hazard assessment of contaminated harbor sediments.« less |
| تدمد: | 2408-9443 1201-3080 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::0b985a568e581c1f8ee9be46dd3d1d2cTest https://doi.org/10.2166/wqrj.1996.037Test |
| رقم الانضمام: | edsair.doi...........0b985a568e581c1f8ee9be46dd3d1d2c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24089443 12013080 |
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