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|title: ||Characterizing sediment acid volatile sulfide concentrations in European streams|
|authors: ||Burton, G. Allen|
Nguyen, Lien T. H.
Janssen, Colin R.
|keywords: ||Risk assessment|
|issue date: ||2007|
|publisher: ||SETAC Press|
|abstract: ||Sediment acid volatile sulﬁde (AVS) concentrations were measured in wadeable streams of a wide variety of ecoregions
of western Europe (84 sites in 10 countries and nine ecoregions) to better understand spatial distribution and ecoregion relationships.
Acid volatile sulﬁde has been shown to be a major factor controlling the bioavailability and toxicity of many common trace metals,
such as Cd, Cu, Ni, Pb, and Zn. Sediment characteristics varied widely. The ratio of the sum of the simultaneously extracted metals
(SEM) to AVS ranged from 0.03 to 486.59. The SEM-AVS ranged from 40.02 to 17.71 mol/g. On a regional scale, sediment
characteristics such as dominant parent soil material showed signiﬁcant trends in AVS distribution and variation by ecoregion. Total
Fe and Mn were correlated weakly with SEM concentrations. Three AVS model approaches (i.e., the SEM:AVS ratio, SEM-AVS
difference, and carbon normalization) were compared at threshold exceedance levels of SEM/AVS 9, SEM-AVS 2, and SEMAVS/fOC 150 mol/g organic carbon (OC). Only 4.76% of the sediments exceeded all three AVS thresholds; 22.6% of the
sediments exceeded two models; and 13% of the sediments exceeded one model only. Using the SEM:AVS, SEM-AVS, and fraction
of organic carbon models, and including site-speciﬁc data and regional soil characteristics, ecoregions 1 (Portugal), 3 (Italy), 4
(Switzerland), and 9 (Belgium/Germany) had the highest potential metals toxicity; ecoregions 13 and 8 (Belgium/France) showed
the lowest potential toxicity. However, because AVS can vary widely spatially and temporally, these data should not be considered
as representative of the sampled ecoregions. The general relationship between AVS levels and sediment characteristics provides
some predictive capability for wadeable streams in the European ecoregions.|
|source: ||Environmental Toxicology and Chemistry|
|appears in collections||BIO - Artigos|
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