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

Dong, Deming; Nelson, Yarrow M.; Lion, Leonard W.; Shuler, Michael L.; Ghiorse, William C.

doi:10.1016/s0043-1354(99)00185-2

Cited by 283 publications

(163 citation statements)

References 32 publications

(42 reference statements)

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“…These results contrast with those of Tessier et al (1996), who estimated (using selective extractions) that Fe oxyhydroxides in lake sediments bound five times more Pb than did Mn oxyhydroxides. However, recent work using a new selective extraction approach suggests much greater adsorption of Pb by Mn oxides than by Fe oxides in Cayuga Lake biofilms (Dong et al 2000;Nelson et al 1999a). These similar results obtained using a completely independent approach add considerable validity to the results described here for the additive approach.…”

Section: Discussionmentioning

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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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: 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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“…Three chemical extraction methods were used to assess their effectiveness at targeting amorphous (or active) versus more crystalline (or free) iron-oxide phase (Anderson and Jenne 1970;McAlister and Smith 1999;Loeppert and Inskeep 1996;Dong et al 2000). All reagent solutions used in the extraction procedures were prepared using reagent-grade chemicals in double de-ionized water.…”

Section: Iron (Fe) Extractionsmentioning

confidence: 99%

Characterization of 200-UP-1 Aquifer Sediments and Results of Sorption-Desorption Tests Using Spiked Uncontaminated Groundwater

Um¹,

Serne²,

Bjornstad³

et al. 2005

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Se-79, and Np-237 during FY 2005. The study completed and summarized in this report will help determine the current risk of the groundwater plume and aid in choosing remediation alternatives for the COC in 200-UP-1 subsurface environments should remediation be necessary.Sediment characterization showed only 4 out of 13 core liner samples were intact, and the others were slough material that dropped to the bottom of the borehole before the split-spoon sampling. The intact samples showed typical Ringold Unit E characteristics such as being dominated by gravel and sand. Moderately reducing conditions are inferred in some core from borehole C4299. This reducing condition was likely caused by the hard tool process used to drill the wells. One core liner from C4299 (B19140) showed significant presence of ferric iron oxide/clay coatings on the gravel surfaces. The 200-UP-1 sediments do contain some clay minerals that exhibit significant cation exchange capacity and thus should be good adsorbents of cationic contaminants. This is especially true of the Ringold Lower mud sample, B19377, from borehole C4300. No highly contaminated sediments-including uranium-were found in the cores from the three new boreholes in the 200-UP-1 operable unit. The presence of slough and "flour" caused by hard tooling is a serious challenge to obtaining field-representative sediments for use in geochemical experiments to determine the adsorption-desorption tendencies of redox sensitive elements such as uranium.The adsorption of COC on intact Ringold Formation sediments and Fe/clay coatings showed that most of the anionic contaminants [Tc(VII), Se(VI), U(VI), Cr(VI), and I(-I)] did not adsorb well compared to cationic [Np(V), Sr(II), and Cs(I)] radionuclides. The high hydrous iron oxide content in Fe oxide/clay coatings caused the highest K d values for U and Np, suggesting that these hydrous iron oxides are the key solid adsorbent in the sediments that control the fate of U and Np. Enhanced adsorption behavior for Tc and Cr, and perhaps Se, on the composite B19136 and B19137 sediment was considered an "artifact" caused by the induced reducing conditions from the hard tool drilling.Additional U(VI) adsorption K d studies were performed on Ringold Formation sediments subjected to varying solution geochemical conditions such as varying the dissolved U and total bicarbonate/carbonate concentration in the groundwater to develop a more robust data base of U(VI) K d s. The <2 mm size fraction of three 200-UP-1 sediments showed a linear U (VI) adsorption isotherm up to 1 ppm of total U (VI) concentration in solution. This fact validates the use of a linear adsorption isotherm (K d ) to predict U (VI) adsorption for sediments in the 200-UP-1 groundwater plume. However, this is not the same as stating that the U (VI) K d value will be constant if the groundwater chemical composition at 200-UP-1 changes with space or time.iv The additional U (VI) K d s obtained from varying carbonate concentrations in solution indicated that U (VI) adsorption was stro...

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“…These mineral particles have very large specific area per unit volume which significantly influence the partitioning of trace metals between soil solutions and the surface of minerals. As an example, the interactions between metal ions and iron and manganese biogenic oxides are very important in determining the distribution and geochemical fate of trace elements, as shown by different authors (Catts and Langmuir, 1986;Dong et al, 2000;Bellanca et al, 1996;Tessier et al, 1996;Nelson and Lion, 2003 and refs therein). As the mobility of heavy metals in ground waters results both from dissolution of the organic substance and desorption from the surface of the inorganic components, the relative abundances of organic matter and soil minerals play a key role in soil solution chemistry with respect to remobilization phenomena and to decontamination treatment of polluted soils.…”

Section: Introductionmentioning

confidence: 96%

Metals distribution in the organic and inorganic fractions of soil: a case study on soils from Sicily

Giacalone

Gianguzza

Orecchio

et al. 2005

Chemical Speciation & Bioavailability

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The content of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn, has been determined in the organic and inorganic fraction of eight soil samples from Sicily. A modified type-Tessier sequential extraction procedure has been used to recognize metals in five different fractions categorised as follows: (a) exchangeable metals, (b) metals bound to carbonates, (c) metals bound to iron and manganese oxides, (d) metals bound to organic matter, and (e) metals in residual fraction. The mineralogical composition of soils samples was characterized by X-ray diffraction. Humic substances were extracted by means of an alkaline extraction procedure. It has been found that both the mineralogical composition and the different content of humic fraction of organic matter in the soils investigated are responsible for the observed trace metal distribution. The obtained data show that a significant amount of trace metals is bound to the organic fraction where different binding sites are present simultaneously. In particular, Pb and Cu seem to be the elements more tightly linked to the organic fraction of soils, whilst cadmium is mostly concentrated into the iron and manganese oxides fraction. The presence of clay minerals in soil is significant for metal distribution, playing a fundamental role in binding metal ions. Besides, it has been observed that the calcophile metal mobility is strongly dependent on the presence of sulfide phases. Applying the Risk Assessment Code to the analyzed soils, it appears that they contain, generally, less than 30% of metals in the exchangeable and carbonate fractions. Calcic brown soil from Piano Zucchi exhibits a medium up to very high risk for Pb, Cd, Co, Zn and Mn. It also been recognized the elevated presence of Cd in the exchangeable and carbonate fractions of andic brown soil on volcanites from Pachino.

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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

Cited by 283 publications

References 32 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

Characterization of 200-UP-1 Aquifer Sediments and Results of Sorption-Desorption Tests Using Spiked Uncontaminated Groundwater

Metals distribution in the organic and inorganic fractions of soil: a case study on soils from Sicily

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