Toxicokinetics and critical body burden of fluoranthene in amphipod bioassays with Hyalella azteca and Diporeia sp.
- NOAA, Ann Arbor, MI (United States). Great Lakes Environmental Research Lab.
Freshwater amphipods (Hyalella azteca and Diporeia sp.) were exposed to fluoranthene under yellow light in 10-day water-only and 30-day sediment bioassays. In water, the 10-d-LC50 for H. azteca (at 20 C) was 564 nmol/L (114 {micro}g/L). Survival of Diporeia (at 4 C) was higher, ranging from 87 to 97% at concentrations up to 1,285 nmol/L (260 {micro}g/L, the limit of water solubility). Although H. azteca was more sensitive than Diporeia to fluoranthene in water, it appeared to be less sensitive in sediment bioassays. Survival of H. azteca in sediment bioassays was generally greater than 90% at all doses, even after 30 d at the highest dose (136 nmol/gdw). A 10-d exposure of H. azteca to a sediment concentration (136 nmol/gdw) with an estimated interstitial water concentration (264 nmol/L), more than twice that of the water-only LC50 (114 nmol/L), resulted in only 5% mortality. In contrast, survival of Diporeia at the highest sediment dose (688 nmol/gdw) averaged 67%, 44%, and 16% after 10, 17 and 30-d exposures, respectively. Thus, although no substantial mortality was observed for Diporeia in water-only bioassays, sediment exposures resulted in significant dose dependent mortality. At the highest sediment doses, observed body burdens in Diporeia were in the range of 1--2 {micro}mol/gww, concentrations that would be expected to produce death by narcosis. In general, the body burden of H. azteca did not exceed 0.5 {micro}mol/gww in the sediment bioassay, which is consistent with the low mortality that was observed. Thus, measures of the actual dose in the organism best define the exposure. These results suggest that estimation of an interstitial water concentration may be insufficient for predicting sediment toxicity.
- OSTI ID:
- 398217
- Report Number(s):
- CONF-9511137-; ISBN 1-880611-03-1; TRN: IM9649%%425
- Resource Relation:
- Conference: 2. Society of Environmental Toxicology and Chemistry (SETAC) world conference, Vancouver (Canada), 5-9 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of Second SETAC world congress (16. annual meeting): Abstract book. Global environmental protection: Science, politics, and common sense; PB: 378 p.
- Country of Publication:
- United States
- Language:
- English
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