Sulfate reduction in freshwater sediments receiving Acid mine drainage.

摘要: One arm of Lake Anna, Va., receives acid mine drainage (AMD) from Contrary Creek (SO42− concentration = 2 to 20 mM, pH 2.5 3.5). Acid-volatile sulfide concentrations, SO42− reduction rates, and interstitial concentrations were measured at various depths in the sediment four stations seasons assess effects AMD-added on bacterial reduction. always an order magnitude higher receiving AMD than a control station another lake that received no AMD. Summer rates also (226 versus 13.5 mmol m−2 day−1), but winter values inconclusive, probably due low temperature (6°C). Profiles showed rapid decrease with depth (from 1,270 6 μM top cm) Bottom-water AMD-receiving highest lowest summer. These data support conclusion there is significant enhancement sediments high inputs