| Autor: |
Jianbo Han, Deyi Ma, Xie Quan, Juying Wang, Qilun Yan |
| Předmět: |
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| Zdroj: |
Hydrobiologia; Jun2005, Vol. 541 Issue 1, p149-154, 6p |
| Abstrakt: |
The utility of interstitial water concentrations of metals and simultaneously extracted metals/acid-volatile sulfide differences (SEM–AVS) in two seasons were investigated to explain the biological availability of zinc in sediments to benthic organisms exposed in the laboratory. The amphipod Grandidierella japonica was exposed, in 10-day acute toxicity tests, to clean sediment spiked with zinc to obtain nominal treatments ranging from 0.25 to 74.4 μmol g−1 dry weight with respect to the molar difference between SEM Zn and AVS. When the molar difference between SEM Zn and AVS (i.e., SEM–AVS) was <0 μmol g−1, the concentration of zinc in the sediment interstitial water was low and few adverse effects were observed for any of the biological endpoints measured. Conversely, when SEM Zn–AVS exceeded 0 μmol g−1, the concentration of zinc in the interstitial water and amphipod mortality increased. These data compare favorably with observations made in short-term exposures and thus support the use of AVS as a normalization phase for predicting toxicity in metal-contaminated sediments in different season. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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