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    The simultaneous influence of pH and Acid Volatile Sulphide on the speciation of heavy metals in calcareous sediments

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    Authors
    Buykx SEJ
    Hoop MAGT van den
    Type
    Report
    Language
    en
    
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    Title
    The simultaneous influence of pH and Acid Volatile Sulphide on the speciation of heavy metals in calcareous sediments
    Translated Title
    De simultane invloed van de pH en zuur extraheerbaar sulfide op de speciatie van zware metalen in kalkrijke sedimenten
    Publiekssamenvatting
    In een aantal kalkrijke zoetwater sedimenten is de invloed van de pH en het zuur extraheerbaar sulfidegehalte (AVS) op de speciatie van zware metalen experimen-teel bestudeerd. Zowel de som van de simultaan ge-extraheerde metalen (SEM: Cd, Cu, Ni, Pb en Zn), als het zuur extraheerbare sulfidegehalte en de bijbehorende SEM-AVS verhouding, hetgeen een maat is voor de beschikbaarheid van zware metalen, namen af met toenemende pH. De steilheid van de bijbehorende helling was afhankelijk van het carbonaatgehalte van het sediment. Het oplosgedrag van de metalen in de sedimenten is beschreven met een vereenvoudigd uitwisselingsmodel. Dit model kon alleen toegepast worden voor zink, omdat door analytische beperkingen niet voldoende gegevens voor de andere metalen voorhanden waren. Dit model was in staat om de verdeling van zink over de vrije en vaste fase in het sediment goed te beschrijven. De bijbehorende protonuitwisselcoefficient was in overeenstemming met literatuurwaarden. De resultaten van dit onderzoek zijn van belang voor een juiste interpretatie van ecotoxiciteitsexperimenten in sedimentsystemen en leveren derhalve een bijdrage aan projecten als integrale normstelling (INS).
    The simultaneous influence of pH and Acid Volatile Sulphide (AVS) on the speciation of heavy metals has been studied in a number of calcareous sediments. Both the sum of the simultaneously extracted metals (SEM: Cd, Cu, Ni, Pb and Zn) and the AVS content and the resulting SEM:AVS ratio, which is a measure of the availability of heavy metals, decreased with increasing values of pH. The corresponding slopes were dependent on the carbonate content of the sediment. In the sediment suspensions, the dissolution of metal due to acid conditions has been described by a simplified exchange model. For the present set of samples, the model could be applied for the metal zinc only due to limitations in the determination of the other metal concentrations. The model was able to predict the speciation of zinc in the sediments quite well. From this model a proton exchange coefficient was obtained, which appeared to be in line with literature data. The results are of practical importance for a correct interpretation of toxicity studies in sediments and, hence, are useful for projects like the setting of environmen-tal quality objectives.
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    URI
    http://hdl.handle.net/10029/260234
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