The relative importance of manganese and iron oxides and organic matter in the sorption of trace metals by surficial lake sediments

Young, Leah Bendell; Harvey, Harold H.

doi:10.1016/0016-7037(92)90055-n

Cited by 117 publications

(34 citation statements)

References 41 publications

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“…Our initial experiments with a previously reported hydroxylamine extraction method for selective removal of Mn and Fe oxides (0.04 M NH 2 OHÁHCl, 25% acetic acid, 6 h at 958C) (Tessier et al, 1979;Young and Harvey, 1992) suggested that the high temperature altered adsorption characteristics of the remaining organic material. There was also evidence that the acetic acid increased the organic content (COD) of the extracted bio®lms.…”

Section: Selective Extraction Techniquesmentioning

confidence: 93%

“…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%

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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

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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Section: Selective Extraction Techniquesmentioning

confidence: 93%

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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“…In addition, the amount of entrained solid particles is more or less than manganese oxides, thus leading a slight influence to the efficiency of desulfurization. Manganese minerals are of potential commercial interest because in addition to Mn they also contain significant amounts (several tenths to more than one weight percent) of Fe, Ca, Ni, Co, and other strategic metals [26][27][28]. The thermodynamic analysis only shows the feasibility of dry desulfurization by manganese oxides.…”

Section: The Overlap Area Of Mn-s-o and Fe-s-o Systemsmentioning

confidence: 99%

Thermodynamic Analysis of Pyrolusite for Dry Flue Gas Desulfurization

Wang

et al. 2016

Environments

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Abstract:Various approaches to flue gas desulfurization by low-grade manganese and high efficiency desulfurization in sintering enterprises were investigated, and the predominance areas of the Mn/Fe-S-O system were constructed in this paper. Additionally, the areas in different temperatures were established based on the thermodynamic properties achieved from manuals. From the view of thermodynamics, manganese oxides were suitable and feasible for desulfurization at an appropriate temperature range from 393 K to 453 K (120˝C to 180˝C), which means that the SO 2 of sintering flue gas could be removed directly without further cooling or heating. The analysis often showed that there was an overlap area of the Mn-S-O and Fe-S-O system, indicating that it would be a coexistence stability region of MnSO 4 and Fe 2 O 3 , which provided a possibility of desulfurization by selective salvation without the sulfate and sulfide of iron forming. More importantly, the predominance areas of Mn/Fe-S-O would offer an attractive way of determining optimum experimental conditions for dry desulfurization by low-grade manganese resources.

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“…Rapid desorption of trace metals from oxyhydroxide particles might be expected to occur under rapidly changing pH or ionic strength conditions or during dissolution of these phases (Lion et al, 1982;Young and Harvey, 1992). However, under short time scales in estuaries, numerous studies have indicated that interactions with POM (including living and decaying phytoplankton, organically coated particles) probably dominate particle-water interactions of trace metals such as Cu and Zn (Heggie et al, 1987;Gerringa, 1990;Lee and Fisher, 1992;Fisher and Wente, 1993;Kerner and Geisler, 1995).…”

Section: Cycling and Transformations Of Cu And Zn And Their Complexinmentioning

confidence: 99%

Speciation, Fluxes, and Cycling of Dissolved Copper and Zinc in Estuaries: The Roles of Sediment Exchange and Photochemical Effects

Skrabal¹,

Rivera-Duarte²

2005

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. REPORT DATE JUL 20052. REPORT TYPE ABSTRACTCopper (Cu) and zinc (Zn) have numerous sources in naval shipping, berthing, and maintenance facilities. Concentrations of these metals in estuaries and harbors can reach levels which are potentially toxic to biota. Hence, discharges and concentrations of these metals are strictly regulated by environmental quality agencies. Because of pervasive problems associated with discharges and remediation of Cu and Zn in estuaries and harbors, it is essential that regulated agencies and regulators alike understand the factors that influence the availability and cycling behavior of these metals in environments relevant to DoD operations. SUBJECT TERMS

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The relative importance of manganese and iron oxides and organic matter in the sorption of trace metals by surficial lake sediments

Cited by 117 publications

References 41 publications

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

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

Thermodynamic Analysis of Pyrolusite for Dry Flue Gas Desulfurization

Speciation, Fluxes, and Cycling of Dissolved Copper and Zinc in Estuaries: The Roles of Sediment Exchange and Photochemical Effects

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