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Archive | 1990

Sediment Criteria Development

Ulrich Förstner; Wolfgang Ahlf; Wolfgang Calmano; Michael Kersten

The role of sediments as carriers and potential sources of contaminants is reviewed. A program of sediment studies will normally consist of a series of objectives of increasing complexity, each drawing part of its information from the preceding data base. The study of dated sediment cores has proven particulary useful as it provides a historical record of the various influences on the aquatic system by indicating both the natural background levels and the man-induced accumulation of pollutants over an extended period of time. Since adsorption of pollutants onto particles is a primary factor in determining the transport, deposition, reactivity, and potential toxicity of these materials, analytical methods should be related to the chemistry of the particle’s surface and/or to the pollutant species highly enriched on the surface.


Archive | 1986

Mobility of Heavy Metals in Dredged Harbor Sediments

Ulrich Förstner; Wolfgang Ahlf; Wolfgang Calmano; Michael Kersten; Wim Salomons

Solubility, mobility, and bioavailability of sediment-bound metals can be increased by four major factors: (1) Lowering of pH; (2) changing of redox conditions; (3) formation of organic complexes; and (4) increasing salinity. While the first two factors are particularly important for on-land deposition of dredged materials, the effect of salinity is particularly important for resuspended cadmium-rich sediments in estuaries. Chemical extraction studies, which were carried out under carefully controlled conditions on both fresh and freeze-dried samples, indicate that aeration of anoxic sediments (e.g., on-land disposal) may both increase and decrease the mobility of heavy metals. Transformation from sulfidic or carbonatic associations to oxidic phases will reduce mobility of manganese, wherease the respective changes from moderately reducible forms to carbonatic and easily reducible phases will enhance the reactivity of zinc during oxidation of dredged material.


Vom Wasser | 1985

Freisetzung von Metallen bei der Oxidation von Schlämmen : umweltchemische Aspekte der Baggergutdeponierung

Michael Kersten; Ulrich Förstner; Wolfgang Calmano; Wolfgang Ahlf

Le depot de boues reduites dans les estuaires doit etre evite ainsi que la dispersion de sediments contamines dans des eaux peu profondes


Vom Wasser | 1989

Ansätze zur Beurteilung der "Sedimentqualität" in Gewässern

Ulrich Förstner; Wolfgang Calmano; Wolfgang Ahlf; Michael Kersten

Developpement de criteres biologiques et chimiques pour caracteriser la qualite des sediments dans les milieux aquatiques


Archive | 1990

Sediment criteria development : contributions from environmental geochemistry to water quality management

Ulrich Förstner; Wolfgang Ahlf; Wolfgang Calmano; Michael Kersten


Archive | 1989

Geochemical processes in landfills

Ulrich Förstner; Michael Kersten; Reinhard Wienberg


Archive | 1994

Effects of redox variations on metal speciation : implications on sediment quality criteria assessment

Ulrich Förstner; Wolfgang Calmano; Jihua Hong; Michael Kersten


Toxicological & Environmental Chemistry | 1986

Metal associations in anoxic sediments and changes following upland disposal

Wolfgang Calmano; Ulrich Förstner; Michael Kersten


Archive | 1986

Behaviour of Dredged Mud after Stabilization with Different Additives

Wolfgang Calmano; Ulrich Förstner; Michael Kersten; D. Krause


Acta Hydrochimica Et Hydrobiologica | 1987

Austausch von Schwermetallen an der Grenzfläche Wasser/Sediment in Gewässern und Baggergutdeponien

Ulrich Förstner; Michael Kersten; Wolfgang Calmano

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Wolfgang Calmano

Hamburg University of Technology

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Wolfgang Ahlf

Hamburg University of Technology

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Wim Salomons

VU University Amsterdam

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