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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Mao, Lingchen; Young, Scott D.; Bailey, Liz (2015)
Publisher: Elsevier
Languages: English
Types: Article
Subjects:
Geochemical speciation models generally include the assumption that all metal bound to humic acid and fulvic acid (HA, FA) is labile. However, in the current study, we determined the presence of a soluble ‘non-labile’ Cu fraction bound to HA extracted from grassland and peat soils. This was quantified by determining isotopically-exchangeable Cu (E-value) and EDTA-extraction of HA-bound Cu, separated by size-exclusion chromatography (SEC) and assayed by coupled ICP-MS. Evidence of time-dependent Cu fixation by HA was found during the course of an incubation study (160 days); up to 50% of dissolved HA-bound Cu was not isotopically exchangeable. This result was supported by extraction with EDTA where approximately 40% of Cu remained bound to HA despite dissolution in 0.05 M Na2-EDTA. The presence of a substantial non-labile metal fraction held by HA challenges the assumption of wholly reversible equilibrium which is central to current geochemical models of metal binding to humic substances.
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    • 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 169 170 171 172 173 174 175 176 177 178 179 180 181 Asakawa, D., Iimura, Y., Kiyota, T., Yanagi, Y., Fujitake, N., 2011. Molecular size fractionation of soil humic acids using preparative high performance size-exclusion chromatography. Journal of Chromatography A 1218, 6448-6453.
    • Benedetti, M.F., VanRiemsdijk, W.H., Koopal, L.K., Kinniburgh, D.G., Gooddy, D.C., Milne, C.J., 1996. Metal ion binding by natural organic matter: From the model to the field.
    • Geochim. Cosmochim. Acta 60, 2503-2513.
    • Burba, P., 1994. Labile/inert metal species in aquatic humic substances - an ion-exchange study. Fresenius J. Anal. Chem. 348, 301-311.
    • Cabaniss, S.E., 1990. pH and ionic-strength effects on nickel fulvic-acid dissociation kinetics.
    • Environ. Sci. Technol. 24, 583-588.
    • Cheng, T., Allen, H.E., 2006. Comparison of zinc complexation properties of dissolved natural organic matter from different surface waters. Journal of Environmental Management 80, 222-229.
    • Chin, Y.P., Gschwend, P.M., 1991. The abundance, distribution, and configuration of porewater organic colloids in recent sediments. Geochimica Et Cosmochimica Acta 55, 1309- 1317.
    • Choppin, G.R., Clark, S.B., 1991. The kinetic interactions of metal-ions with humic acids.
    • Mar. Chem. 36, 27-38.
    • Christla, I., Kretzschmar, R., 2001. Interaction of copper and fulvic acid at the hematite-water interface. Geochim. Cosmochim. Acta 65, 3435-3442.
    • Degryse, F., Smolders, E., Parker, D.R., 2009. Partitioning of metals (Cd, Co, Cu, Ni, Pb, Zn) in soils: concepts, methodologies, prediction and applications - a review. Eur. J. Soil Sci. 60, 590-612.
    • Fish, S.J., Brassard, P., 1997. Dialysis Membrane to Prevent Cadmium Ion Specific Electrode fouling. Talanta 44, 939-945.
    • Fitch, A., Stevenson, F.J., Chen, Y., 1986. Complexation of Cu(II) with a soil humic acid: Response characteristics of the Cu(II) ion-selective electrode and ligand concentration effects.
    • Organic Geochemistry 9, 109-116.
    • Gabler, H.E., Bahr, A., Heidkamp, A., Utermann, J., 2007. Enriched stable isotopes for determining the isotopically exchangeable element content in soils. Eur. J. Soil Sci. 58, 746- 757.
    • Gabler, H.E., Bahr, A., Mieke, B., 1999. Determination of the interchangeable heavy-metal fraction in soils by isotope dilution mass spectrometry. Fresenius J. Anal. Chem. 365, 409- 414.
    • Jackson, B.P., Ranville, J.F., Bertsch, P.M., Sowder, A.G., 2005. Characterization of colloidal and humic-bound Ni and U in the "dissolved" fraction of contaminated sediment extracts. Environ. Sci. Technol. 39, 2478-2485.
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