Seasonal bioavailability of sediment-associated heavy metals along the Mississippi river floodplain.
A value of simultaneously extracted metal to acid-volatile sulfide (SEM-AVS) can provide important information regarding metal availability in anaerobic sediment. SEM and AVS concentrations were obtained by the cold-acid purge-and-trap technique during spring and summer at six locations along the Mississippi River floodplain. SEM-AVS values and AVS concentrations did not vary significantly between locations during both seasons. AVS concentrations were significantly greater during summer than spring, resulting in significantly lower SEM-AVS values in summer. Total SEM concentrations did not significantly vary between seasons or specific locations. SEM-AVS values were greater than one at each location during both seasons. Sediment metal toxicity was predicted to be absent for benthic organisms along the river floodplain.
Grabowski
L A
LA
Department of Rangeland Ecosystem Science, Colorado State University, Berthoud 80513, USA. lgrabo3169@aol.com
Houpis
J L
JL
Woods
W I
WI
Johnson
K A
KA
D000818:Animals; D001682:Biological Availability; D004190:Disasters; D004784:Environmental Monitoring; D005544:Forecasting; D019015:Geologic Sediments / Q000737:chemistry*; D007448:Invertebrates; D019216:Metals, Heavy / Q000032:analysis* / Q000493:pharmacokinetics / Q000633:toxicity; D018570:Risk Assessment; D012621:Seasons; D013440:Sulfides / Q000737:chemistry; D014835:Volatilization
D019216:Metals, Heavy; D013440:Sulfides