Influence of flooding, salinity and inundation time on the bioavailability of metals in wetlands
Speelmans, M.; Vanthuyne, D.R.J.; Lock, K.; Hendrickx, F.; Du Laing, G.; Tack, F.M.G.; Janssen, C.R. (2007). Influence of flooding, salinity and inundation time on the bioavailability of metals in wetlands. Sci. Total Environ. 380(1-3): 144-153. http://dx.doi.org/10.1016/j.scitotenv.2006.07.041
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| Trefwoorden |
Bioassay
Bioavailability
Chemical elements > Metals > Heavy metals > Cadmium
Environmental factors
Environments > Aquatic environment
Freshwater environment
Heavy metals
Industrial water
Pollutants
Properties > Chemical properties > Redox potential
Salinity
Sediments
Soil pollution
Toxicity
Toxicology > Ecotoxicology
Water > Surface water
Wetlands
Zinc
Annelida [WoRMS]; Invertebrata [Ongewervelden]; Oligochaeta [WoRMS]; Tubifex tubifex (Müller, 1774) [WoRMS]
Brak water; Zoet water |
| Author keywords |
sediment; river restoration; inundation; salinity; metalbioavailability; oligochaete |
| Abstract |
Controlled flooding of lowlands is considered as a potential water management strategy to minimize the risk of flooding of inhabited areas during high water periods. However, due to industrial activities, river water, sediments and soils are often contaminated with metals which may have adverse effects on the ecosystem's structure and functioning. Additionally, salinity may greatly affect the bioavailability and toxicity of metals present or imported into these systems. The effect of contaminated soils under different flooding and salinity exposure scenarios on the growth, reproduction and metal accumulation in the oligochaete Tubifex tubifex (Müller, 1774) were examined. In these bioassays metal contaminated soils were flooded with water of different salinities (0 and 3 psu), and tested after 0, 6 and 12 months of permanent inundation. We indeed found that inundation time had significant decreasing effects on Cu and Zn accumulation; although initial accumulation of Cu and Zn was higher in the previously unflooded soil at the start of the flooding treatment, these differences seem to disappear after 6 months of permanent inundation. Moreover, the complex interaction between substrate type and salinity suggests that redox potential is probably of major importance. |
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