TY - JOUR
T1 - Biogeochemical controls on the speciation and aquatic toxicity of Vanadium and other metals in sediments from a river reservoir
AU - Nedrich, S.M.
AU - Chappaz, Anthony
N1 - Funding Information:
We would like to thank the following lab staff for their support: E. Cervi, C. Cole, and M. Xiao. Special thanks to M. Shafer and University of Wisconsin Trace Element Research Group members, C. Hammerschmidt, S. Hlohowskyj, the dedicated staff at FTN Associates, and CH2M. This research was supported by The Dow Chemical Company , with some contribution from grants ACS-PRF 54583-DNI2 and NSF-EAR 1503596 (awarded to AC). Appendix A
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018
Y1 - 2018
N2 - Effects of hydrologic variability on reservoir biogeochemistry are relatively unknown, particularly for less studied metals like vanadium (V). Further, few studies have investigated the fate and effects of sediment-associated V to aquatic organisms in hydrologically variable systems. Our primary objective was to assess effects of hydrologic manipulation on speciation and toxicity of V (range: 635 to 1620 mg kg− 1) and other metals to Hyalella azteca and Daphnia magna. Sediments were collected from a reservoir located in a former mining area and microcosm experiments were conducted to emulate 7-day drying and inundation periods. Despite high sediment concentrations, V bioavailability remained low with no significant effects to organism survival, growth, or reproduction. The lack of V toxicity was attributed to reduced speciation (III, IV), non-labile complexation, and sorption to Al/Fe/Mn-oxyhydroxides. Zinc (Zn) increased in surface and porewater with inundation, for some sediments exceeding the U.S. EPA threshold for chronic toxicity. While no effects of Zn to organism survival or growth were observed, Zn body concentrations were negatively correlated with H. azteca growth. Results from this study indicate that V bioavailability and environmental risk is dependent on V-speciation, and V is less influenced by hydrologic variability than more labile metals such as Zn.
AB - Effects of hydrologic variability on reservoir biogeochemistry are relatively unknown, particularly for less studied metals like vanadium (V). Further, few studies have investigated the fate and effects of sediment-associated V to aquatic organisms in hydrologically variable systems. Our primary objective was to assess effects of hydrologic manipulation on speciation and toxicity of V (range: 635 to 1620 mg kg− 1) and other metals to Hyalella azteca and Daphnia magna. Sediments were collected from a reservoir located in a former mining area and microcosm experiments were conducted to emulate 7-day drying and inundation periods. Despite high sediment concentrations, V bioavailability remained low with no significant effects to organism survival, growth, or reproduction. The lack of V toxicity was attributed to reduced speciation (III, IV), non-labile complexation, and sorption to Al/Fe/Mn-oxyhydroxides. Zinc (Zn) increased in surface and porewater with inundation, for some sediments exceeding the U.S. EPA threshold for chronic toxicity. While no effects of Zn to organism survival or growth were observed, Zn body concentrations were negatively correlated with H. azteca growth. Results from this study indicate that V bioavailability and environmental risk is dependent on V-speciation, and V is less influenced by hydrologic variability than more labile metals such as Zn.
UR - https://doi.org/10.1016/j.scitotenv.2017.08.141
M3 - Article
SN - 0048-9697
VL - 612
SP - 313
EP - 320
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -