Trace-metal adsorption characteristics of estuarine particulate matter:  evaluation of contributions of iron/manganese oxide and organic surface coatings

Lion, Leonard W.; Altmann, Robert Scott; Leckie, James O.

doi:10.1021/es00104a007

Cited by 305 publications

(117 citation statements)

References 16 publications

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“…For example, biofilms could alter the deposition of metal oxides through either passive or active biological processes (Ghiorse 1984;Lion et al 1988;Lo et al 1996). Biological catalysis of Mn oxidation (as described here) is an example of an active deposition process, and similarly, biological oxidation of Fe could result in increased trace metal adsorption by Fe oxides.…”

Section: Discussionmentioning

confidence: 94%

“…Some researchers have reported that metal oxides are the single most important environmental determinant of transition metal adsorption (Krauskopf 1956;Jenne 1968), while others have reported a more important role for organic materials because of their high active surface area (Balistrieri and Murray 1983;Salim 1983;Sigg 1985). Selective extraction methods, in which metal bound to extracted phases is quantified, have been used to estimate the relative roles of the reactive components of sediments in adsorbing trace metals (Tessier et al 1979;Lion et al 1982;Luoma 1989;Campbell and Tessier 1991;Davies 1992;Weimin et al 1992;Coetzee et al 1995;Martin et al 1996). However, adsorbing phases identified with these methods are operationally defined by the extractants employed.…”

Section: Acknowledgmentsmentioning

confidence: 99%

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Lead binding to metal oxide and organic phases of natural aquatic biofilms

Nelson

Lion

Shuler

et al. 1999

Limnology & Oceanography

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The role of the composition of surface-coating materials in controlling trace metal adsorption in aquatic environments was investigated using natural biofilms that developed on glass slides in three New York State lakes and a water-supply well. Adsorption isotherms were obtained for Pb binding to each of the biofilms in solutions with defined Pb speciation at 25ЊC and pH 6.0, with Pb concentrations ranging from 0.2 to 2.0 M. Adsorption isotherms for Pb binding to laboratory-derived metal oxides and surrogate organic materials were determined under the same conditions. These isotherms, combined with characterization of natural biofilm composition, were used to estimate the relative contributions of the organic and metal oxide surface-coating constituents by assuming additivity of adsorption to discrete adsorbing phases. Cells of a diatom (Navicula peliculosa), a green alga (Chlorella vulgaris), the bacterium Leptothrix discophora, and extracellular polymer of the bacterium Burkholdaria cepacia were tested as laboratory analogs for the organic phase of the biofilms. Amorphous Fe oxyhydroxide, ␥Al 2 O 3 , and a laboratoryderived biogenic Mn oxyhydroxide were used as laboratory surrogates for biofilm minerals. The sum total of predicted Pb binding to the defined surrogates accounted for at least 90% of the total observed Pb binding in the three lake biofilms and 60% of that observed for the well biofilms. For the lake biofilms, Pb adsorption to Fe and Mn oxides was significantly greater than that estimated for organic materials. The use of biogenic Mn oxide as a model component resulted in an estimated Pb adsorption to Mn oxyhydroxides in the lake biofilms up to four times greater than that estimated for Fe oxyhydroxide. Estimated Pb binding by Al oxide was negligible for all four biofilms. These results suggest that Fe and biogenic Mn oxides exert the greatest influence on Pb adsorption in oxic freshwater environments at pH 6.0.The cycling of transition metals in aquatic environments is controlled by adsorptive scavenging, which in turn is controlled by the composition of the aqueous phase and the reactive organic and inorganic components at surfaces

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Section: Discussionmentioning

confidence: 94%

Section: Acknowledgmentsmentioning

confidence: 99%

Lead binding to metal oxide and organic phases of natural aquatic biofilms

Nelson

Lion

Shuler

et al. 1999

Limnology & Oceanography

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“…On the other hand, diagenesis of sediments may also affect trace metal fluxes in sediments (Lee and Cundy, 2001;Deflandre et al, 2002). Many studies showed that diagenetically formed Fe-Mn oxyhydroxides play a pivotal role in regulating concentrations of trace metal accumulation, speciation, and distribution along sediment profiles in some estuaries (Lion et al, 1982;Belzile et al, 1989;Buckley, 1989;Belzile and Tessier, 1990;Hamilton-Taylor et al, 1996). However, Douglas and Adeney (2000) found that the diagenetic processes in sediments do not substantially influence the trace metal/Fe ratios.…”

Section: Influx Of Trace Metals Over Timementioning

confidence: 99%

Over one hundred years of trace metal fluxes in the sediments of the Pearl River Estuary, South China

Zhang

et al. 2004

Environmental Pollution

154

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The rapid economic development in the Pearl River Delta (PRD) region in south China in the last three decades has had a significant impact on the local environment.Estuarine sediment is a major sink for contaminants and nutrients in the surrounding ecosystem. The accumulation of trace metals in sediments may cause serious environmental problems in the aquatic system. Thirty sediment cores were collected in the Pearl River Estuary (PRE) in 2000 for a study on trace metal pollution in this region. Heavy metal concentrations and Pb isotopic compositions in the four 210 Pb-dated sediment cores were determined to assess the fluxes in metal deposits over the last one hundred years. The concentrations of Cu, Pb and Zn in the surface sediment layers were generally elevated when compared with the sub-surface layers. There has been a significant increase in inputs of Cu, Pb and Zn in the PRE since the 1970s. The results also showed that different sampling locations in the estuary received slightly different types of inputs. Pb isotopic composition data indicated that the increased Pb in the recent sediments was of anthropogenic origin. The * Corresponding author (X.D. Li), email: cexdli@polyu.edu.hk; fax: (852) 2334 6389; tel: (852) 2766 6041 This is the Pre-Published Version.2 results of trace metal influxes showed that about 30% of total Pb and 15% of total Zn in the sediments in the 1990s were from anthropogenic sources. The combination of trace metal analysis, Pb isotopic composition and 210 Pb dating in an estuary can provide vital information on the long-term accumulation of metals in sediments.

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“…Extractants have previously been used to dissolve metal oxide or organic components in sediments and soils along with the trace metals associated with these components (Lindsay and Norvell, 1978;Tessier et al, 1979;Lion et al, 1982;Bauer and Kheboian, 1986;Martin et al, 1987;Tessier and Campbell, 1987;Luoma, 1989;Campbell and Tessier, 1991;Young and Harvey, 1992). While useful for estimating trace metal bioavailability, selective extraction methods are dicult to use for accurately quantifying trace metals associated with speci®c biogeochemical phases because the extracted phases are operationally de®ned and are subject to experimental limitations such as removal of additional materials besides the target component during extraction.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Pb and Cd onto metal oxides and organic material in natural surface coatings as determined by selective extractions: new evidence for the importance of Mn and Fe oxides

et al. 2000

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AbstractÐSurface coatings (bio®lms and associated minerals) were collected on glass slides in the oxic surface waters of Cayuga Lake (New York State, U.S.A.) and were used to evaluate the relative contributions of Fe, Mn and Al oxides and organic material to total observed Pb and Cd adsorption by the surface coating materials. Several alternative selective extraction techniques were evaluated with respect to both selectivity and alteration of the residual unextracted material. Pb and Cd adsorption was measured under controlled laboratory conditions (mineral salts solution with de®ned metal speciation, ionic strength 0.05 M, 258C and pH 6.0) before and after extractions to determine by dierence the adsorptive properties of the extracted component(s). Hydroxylamine hydrochloride (0.01 M NH 2 OHÁHCl+0.01 M HNO 3 ) was used to selectively remove Mn oxides, sodium dithionite (0.3 M Na 2 S 2 O 4 ) was used to remove Mn and Fe oxides, and 10% oxalic acid was used to remove metal oxides and organic materials. Several other extractants were evaluated, but preliminary experiments indicated that they were not suitable for these experiments because of undesirable alterations of the residual, unextracted material. The selected extraction methods removed target components with eciencies between 71 and 83%, but signi®cant amounts of metal oxides and organic materials other than the target components were also removed by the extractants (up to 39%). Nonlinear regression analysis of the observed Pb and Cd adsorption based on the assumption of additive Langmuir adsorption isotherms was used to estimate the relative contributions of each surface coating constituent to total Pb and Cd binding of the bio®lms. Adsorption of Cd to the lake bio®lms was dominated by Fe oxides, with lesser roles attributed to adsorption by Mn and Al oxides and organic material. Adsorption of Pb was dominated by Mn oxides, with lesser roles indicated for adsorption to Fe oxides and organic material, and the estimated contribution of Al oxides to Pb adsorption was insigni®cant. The ®tted Pb adsorption isotherm for Fe oxides was in excellent agreement with those obtained through direct experiments and reported in independent investigations. The estimated Pb distribution between surface coating components also agreed well with that previously predicted by an additive adsorption model based on Pb adsorption isotherms for laboratory surrogates for Mn, Fe and Al oxides and de®ned biological components.

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Trace-metal adsorption characteristics of estuarine particulate matter: evaluation of contributions of iron/manganese oxide and organic surface coatings

Cited by 305 publications

References 16 publications

Lead binding to metal oxide and organic phases of natural aquatic biofilms

Lead binding to metal oxide and organic phases of natural aquatic biofilms

Over one hundred years of trace metal fluxes in the sediments of the Pearl River Estuary, South China

Adsorption of Pb and Cd onto metal oxides and organic material in natural surface coatings as determined by selective extractions: new evidence for the importance of Mn and Fe oxides

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