Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/51424
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Type: Journal article
Title: Speciation and Isotopic Exchangeability of Nickel in Soil Solution
Author: Nolan, A.
Ma, Y.
Lombi, E.
McLaughlin, M.
Citation: Journal of Environmental Quality, 2009; 38(2):485-492
Publisher: Amer Soc Agronomy
Issue Date: 2009
ISSN: 0047-2425
1537-2537
Statement of
Responsibility: 
Annette L. Nolan, Yibing Ma, Enzo Lombi and Mike J. McLaughlin
Abstract: Knowledge of trace metal speciation in soil pore waters is important in addressing metal bioavailability and risk assessment of contaminated soils. In this study, free Ni(2+) activities were determined in pore waters of long-term Ni-contaminated soils using a Donnan dialysis membrane technique. The pore water free Ni(2+) concentration as a percentage of total soluble Ni ranged from 21 to 80% (average 53%), and the average amount of Ni bound to dissolved organic matter estimated by Windermere Humic Aqueous Model VI was < or = 17%. These data indicate that complexed forms of Ni can constitute a significant fraction of total Ni in solution. Windermere Humic Aqueous Model VI provided reasonable estimates of free Ni(2+) fractions in comparison to the measured fractions (R(2) = 0.83 with a slope of 1.0). Also, the isotopically exchangeable pools (E value) of soil Ni were measured by an isotope dilution technique using water extraction, with and without resin purification, and 0.1 mol L(-1) CaCl(2) extraction, and the isotopic exchangeability of Ni species in soil water extracts was investigated. The concentrations of isotopically non-exchangeable Ni in water extracts were <9% of total water soluble Ni concentrations for all soils. The resin E values expressed as a percentage of the total Ni concentrations in soil showed that the labile Ni pool ranged from 0.9 to 32.4% (average 12.4%) of total soil Ni. Therefore the labile Ni pool in these well-equilibrated contaminated soils appears to be relatively small in relation to total Ni concentrations.
Keywords: Nickel; Isotopes; Soil; Colloids; Soil Pollutants; Water Pollutants, Chemical
RMID: 0020090304
DOI: 10.2134/jeq2006.0275
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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