Metal bound to sediments bioavailability and sediment toxicity assessment using Arenicola marina in a field survey

In this research work, toxicity and bioavailability of metals Zn, Ni, Pb, Cd, Cu, Co and Hg bound to sediments from two sites (Guad1 and Guad2) of Guadalete River Estuary (SW Spain) were evaluated. Sediment physico-chemical characterization was undertaken and mortality and metal accumulation were determined in the species Arenicola marina after a 14 days in situ exposure in benthic cages.

Metal concentration in sediment normalized on OC was higher for most metals in Guad2. Metal enrichment factor (EF) showed that Arenicola marina was susceptible of accumulating Hg, Ni, Zn in both sites and Pb in Guad1. Zn, Ni and Hg EF and Zn and Ni accumulation rate were higher in Guad2. Also in this site, mortality reached 100%. Results strongly suggested a connection between toxicity and metal bioavailability and accumulation, what makes accumulation studies a reliable tool to evaluate sediment quality and to predict toxicity episodes.

Copyright: © Aristotle University of Thessaloniki
Quelle: 2nd International Conference 2009 (Juni 2009)
Seiten: 6
Preis inkl. MwSt.: € 5,00
Autor: Julia Ramos-Gómez
Laura Martín-Díaz
T. Ángel DelValls

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