Modification of metal partitioning by supplementing acid volatile sulfide in freshwater sediments

Edward N. Leonard, David R. Mount, Gerald T. Ankley

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Acid volatile sulfide (AVS) is a component of sediments that complexes some cationic metals and thereby influences the toxicity of these metals to benthic organisms. Experimental manipulation of AVS in metal-contaminated sediments may provide a means to neutralize toxicity due to metals and thereby help assess the cause of sediment toxicity. This study evaluated the effect of spiking FeS, Na2S, and Na2S/FeSO4 combined on the concentration of AVS, simultaneously extracted metals (SEM), and pore-water metals in uncontaminated and metal-enriched sediments. Experiments with solid FeS showed comparatively low effectiveness in increasing AVS. Spiking with either Na2S or Na2S/FeSO4 combined increased AVS and/or reduced SEM metal in Cd-, Zn-, and Ni-spiked sediments and in a Cu-contaminated sediment collected from the field. Spiking with Na2S/FeSO4 caused marked reductions in dissolved metal concentrations in the pore waters of these sediments; spiking with Na2S alone caused an apparent elevation in pore-water (Cu) metal that we believe is an artifact of metal sulfide formation in the filtered pore water. When the Na2S/FeSO4 treatment was evaluated under conditions simulating those in sediment toxicity tests, alterations of AVS/SEM were nearly quantitative, except for Ni-spiked sediment, which showed lower efficiency than the Cd, Zn, or Cu sediments. It appears that AVS spiking holds promise for the experimental manipulation of metal toxicity in sediments.

Original languageEnglish (US)
Pages (from-to)858-864
Number of pages7
JournalEnvironmental Toxicology and Chemistry
Volume18
Issue number5
DOIs
StatePublished - 1999

Keywords

  • Acid volatile sulfide
  • Freshwater
  • Metal
  • Pore water
  • Sediment

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