Availability of heavy metals for uptake by Salix viminalis on a moderately contaminated dredged sediment disposal site.
Extractability of Cd, Cr, Cu, Ni, Pb, and Zn in a dredged sediment disposal site was assessed using single extraction procedures (H2O; 0.01 M CaCl2; 1 M NH4OAc; NH4OAc-EDTA; CaCl2-TEA-DTPA). Only Cd and Zn were found to exceed statutory threshold values for total content. The field was planted with Salix viminalis "Orm" and accumulation of heavy metals in bark, leaves, roots, and wood was evaluated at seven sampling locations along an observed gradient in texture and pollution. Biomass production was high, ranging from 13.2 to 17.8 t ha(-1) y(-1) dry weight. Metal accumulation in aboveground plant parts was low, amounting to the following annually extracted mass of metals per ha: 5034 g Zn, 83 g Cd, 145 g Cu, 83 g Pb, 12 g Ni and 6 g Cr. The use of accumulating clones and the use of soil amendments might enhance extraction efficiency in future research.
Meers
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Department of Applied Analytical and Physical Chemistry, Laboratory of Analytical Chemistry and Applied Ecochemistry, Ghent University, Coupure Links 653, 9000 Ghent, Belgium. erik.meers@ugent.be
Lamsal
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Vervaeke
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P
Hopgood
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M
Lust
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N
Tack
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FM
D001530:Belgium; D001673:Biodegradation, Environmental; D018533:Biomass; D002104:Cadmium / Q000032:analysis; D002857:Chromium / Q000032:analysis; D003247:Conservation of Natural Resources; D003300:Copper / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D006256:Hazardous Waste; D007854:Lead / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis / Q000378:metabolism*; D009532:Nickel / Q000032:analysis; D012037:Refuse Disposal; D032108:Salix / Q000737:chemistry / Q000378:metabolism*; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D015032:Zinc / Q000032:analysis
D006256:Hazardous Waste; D019216:Metals, Heavy; D012989:Soil Pollutants; D002104:Cadmium; D002857:Chromium; D007854:Lead; D003300:Copper; D009532:Nickel; D015032:Zinc