title: Seasonal bioavailability of sediment-associated heavy metals along the Mississippi river floodplain.
abstract: 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.
authors.affiliation: Department of Rangeland Ecosystem Science, Colorado State University, Berthoud 80513, USA. lgrabo3169@aol.com
authors.forename: L A
authors.initials: LA
authors.lastname: Grabowski
authors.forename: J L
authors.initials: JL
authors.lastname: Houpis
authors.forename: W I
authors.initials: WI
authors.lastname: Woods
authors.forename: K A
authors.initials: KA
authors.lastname: Johnson
mesh_terms: 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
chemical_list: D019216:Metals, Heavy; D013440:Sulfides