Model of trace-metal partitioning in marine sediments

Oakley, Stewart M.; Nelson, Peter O.; Williamson, Kenneth

doi:10.1021/es00086a015

Cited by 144 publications

(67 citation statements)

References 18 publications

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“…Each geochemical phase (GPH) seems to have different adsorption constants, as reported by Oakley et al (1981). Hydrous Mn oxides exhibit more extensive isomorphic substitution than amorphous Fe oxides and, therefore, show conditional equilibrium contants (for Cu and Cd) of one or two orders as compared to those of bentonite clay, Fe oxides or humic acids.…”

Section: Introductionmentioning

confidence: 79%

“…Hydrous Mn oxides exhibit more extensive isomorphic substitution than amorphous Fe oxides and, therefore, show conditional equilibrium contants (for Cu and Cd) of one or two orders as compared to those of bentonite clay, Fe oxides or humic acids. Despite the relative small amount normally present in the sediment (Oakley et al, 1981) Mn oxide plays an important role in metal adsorption. However, in the case of very anoxic sediments, hydrogen sulfide could be the main determining factor because of the very low solubility constants (Ks°) of the sulfide of the more important heavy metals involved in sediment pollution.…”

Section: Introductionmentioning

confidence: 99%

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A five-year study on the heavy-metal pollution of Guanabara Bay sediments (Rio de Janeiro, Brazil) and evaluation of the metal bioavailability by means of geochemical speciation

et al. 1997

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Abstract--Surface sediments of the Guanabara Bay (Rio de Janeiro, Brazil) were analyzed by a sequential extraction procedure for Cd, Cr, Cu, Pb, Zn, Mn and Fe, determining their distribution among five geochemical phases and in the nitric acid extractable phase. Bioavailable phases and non-bioavailable phases have been determined in six transects in the bay to define the significant level of pollution due to sediment meLal contamination. A multiple correlation showed limited responsibility of Mn and Fe oxides and humic acids in the adsorption process, which allowed discrimination among the different processes and suggested the strong influence of the hydrogen sulfide present in the highly reduced bay bottom environment. The authors suggest the need to avoid disturbing bottom sediment by dredging or by artificial bottom aeration which could result in a rapid worsening of the environment due to the accelerated formation of more soluble oxygenated metal compounds making the toxic metals much more available to the benthic fauna and to the bay biota in general. © 1997 Elsevier Science Ltd

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Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

A five-year study on the heavy-metal pollution of Guanabara Bay sediments (Rio de Janeiro, Brazil) and evaluation of the metal bioavailability by means of geochemical speciation

et al. 1997

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“…The differences among the solids were used for an assessment of the role of the corresponding components in the bonding of radionuclides in environmental solids. Some authors tried to predict quantitatively the uptake of trace elements by sediments from parameters deduced from model solids (components) [160,161]. It has been shown, however, that, for instance, the adsorption affinity of river sediments for radium cannot be predicted accurately from their composition and other properties [162], Therefore, reliable conclusions on the speciation of radionuclides are not easy to obtain from the experiments with model solids.…”

Section: Model Experiments For the Speciation In Sediments Soils Andmentioning

confidence: 99%

Speciation of Radionuclides in the Environment

Gunten

Beneš

1995

Radiochimica Acta

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Methods for the determination of the speciation of radionuclides in aerosols, in aquatic solutions, in sediments, soils and rocks are reviewed. At present, most of the results about speciation are deduced from model calculations, model experiments, and separation of species (forms) of radionuclides, e.g., by sequential extraction procedures. Methods of direct determination of speciation of radionuclides (e.g., by laser induced spectroscopy) are in general not yet sensitive enough for a measurement of the very low concentrations of radionuclides in the environment. The methodological part of this paper is followed by a review of the very abundant literature about speciation of important radionuclides in the environment, i.e., in the atmosphere, hydrosphere and lithosphère. The review does not include the biosphere. Literature up to spring 1993 is included (with a few more recent additions).

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“…The toxicity of heavy metals to aquatic organisms has been a subject of interest to biologist for many years. Adsorption of trace metals onto natural particulate matter can play an important role in determining trace metal speciation in many aquatic systems [1][2][3][4]. Among different types of pollution, the industrial waste constitutes the major source of various kinds of metal pollution in natural water [5].…”

Section: Introductionmentioning

confidence: 99%