New WMRC Research Report Available

RR-109 Metal Bioaccumulation by Garden Vegetables Grown on Soil Derived from Peoria Lake Sediment / Ebbs, Stephen D. — Champaign, IL: Illinois Waste Management and Research Center, 2006.

Abstract: This study was undertaken to determine whether use of recovered sediment as a growth media for garden vegetables promotes the bioaccumulation of undesirable elements in plant tissues. Five plant species, bean, broccoli, carrot, pepper, and tomato, were grown in pots containing either dewatered, aged sediment or a reference soil. Plant growth, development, and yield in the two soils were quantified. Edible and vegetative tissues from the plants were analyzed for 19 elements, including environmentally-important heavy metals and metalloids. Some plants grown in sediment showed a greater biomass and yield as compared to the Ag soil. Elemental analysis of the tissues revealed that only Zn and Mo were elements that were significantly greater in sediment-grown plants on a consistent basis. While significant, Zn concentrations were no more than 3-fold higher than those in plants from the reference soil. The same trend was observed for Mo, except for bean tissues, which showed a >10-fold greater concentration (>20 mg kg-1 DW) in sediment-grown plants. The Mo concentrations observed are >3-fold greater than those associated with Mo toxicity to grazing animals, suggesting that use of recovered sediment should be monitored so as to prevent transfer of this element to terrestrial food webs.

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