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Göteborgs universitets publikationer

Ecological hazard assessment of metal contaminated soil at two lighthouse sites in Atlantic Canada

Författare och institution:
Emily Chapman (Institutionen för växt- och miljövetenskaper); John Murimboh (-); Göran Dave (Institutionen för växt- och miljövetenskaper)
Publicerad i:
SETAC Europe 19th Annual Meeting, 31 May-4 June 2009, Göteborg, Sweden,
Konferensbidrag, poster
Sammanfattning (abstract):
Ecological hazard assessment of metal contaminated soil is commonly completed using guideline values based on total metal concentrations in soil. However, only certain fractions of the contaminants are bioavailable and will pose a hazard to the environment. When basing the hazard assessment solely on guideline values, effects due to contaminants which are not analyzed, as well as effects due to mixtures and metabolites can be overlooked. There is a need to accurately assess and relate measured concentrations of contaminants in soil to bioavailability and toxic effects. The objective of this study was to assess the relationships between measured concentrations of metals in field collected soil and soil leachates to the biological effects in organisms exposed to the contaminated soil (wheat, Triticum aestivum, growth) and soil leachate (lettuce, Lactuca sativa, germination and waterflea, Daphnia magna, survival). The growth test with wheat was conducted during 6 weeks in a phytotron. Diffusive gradients in thin film (DGT) samplers were also inserted into the wheat pots during week 1 and week 6 for determination of labile metal concentrations. Lettuce (7 day exposure) and Daphnia magna (24 and 48 h exposure) tests were completed weekly using the soil leachate drained from the wheat pots. Following 6 weeks of testing, the wheat shoots were harvested and analysed for total metal content. In addition to correlations between total concentrations of metal in soil and soil leachate to bioassay results, relationships between accumulated concentrations of metals in wheat shoots and DGT accumulated concentrations will be presented. The influence of total organic carbon and pH will also be assessed in terms of their effects on contaminant bioavailability and toxicity.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap
Geovetenskap och miljövetenskap ->
Oceanografi, hydrologi, vattenresurser ->
Vatten i natur och samhälle
Biologiska vetenskaper
Medicinska grundvetenskaper ->
Farmaceutisk vetenskap ->
Lantbruksvetenskap, skogsbruk och fiske ->
hazard assessment, soil toxicity, contaminant bioavailability, metals
Postens nummer:
Posten skapad:
2009-12-22 11:25

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