Assessing Trace Element Uptake by Vegetation on a Coal Fly Ash Landfill

摘要: Improved methods are required to assess the risks posed by uptake of potentially toxic elements such as selenium (Se), boron (B), and molybdenum (Mo) vegetation on contaminated sites. In order develop risk, was collected from two sites a soil-capped coal fly ash landfill near Dunkirk, New York, during June 1991 August 1992. The mean concentrations (μg g-1 dry weight) Se Mo in shoots did not exceed, respectively, 0.12 18.7 bird's-foot trefoil (Lotus corniculatus L.), 0.06 12.1 red clover (Trifolium pratense 0.07 5.3 timothy (Phleum 0.09 2.2 mixture grasses. These were greater than those same species harvested concurrently non-landfill site. B at ranged 29 53 μg legumes 2 11 grasses, less one site but another. Within landfill, concentration grasses correlated with soil ash. both double that despite higher upper (0–15 cm) Therefore grass roots seem be accessing means mass flow or other mechanisms. Based our findings significant variation trace element among species, harvests, locations within sites, we recommend contemporaneous transect sampling least used landfills where contamination may occur.