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A survey was established to study the mobility of metals (Cr, Mo, Cu, and Zn) from soils amended with municipal sewage sludge (SS) into plants grown at three locations in Kentucky and compare metal concentrations in plants to their permissible standard limits. The field experiments were established at Meade, Adair, and Franklin Counties in Kentucky areas where commercial growers use SS as alternative to inorganic fertilizers. Metals in soil and plant tissue were quantified using Inductively Coupled Plasma (ICP) spectrometer. Results revealed that different trace metals had different uptake pattern by different plants. Cr concentrations in beans has shown very little accumulation in bean seeds. Cr and Mo concentrations in plants grown at the three locations were below the permissible level of 1.3 µg g-1 tissue. Other than onion bulbs, Cu concentrations were above the permissible level of 10 µg g-1 tissue in plants grown at Meade site. At the Adair site, Cu was above the limit only in tobacco leaves. Whereas at Franklin site, Cu was above the limit in potato tubers, onion bulbs, and tomato fruits. Zn concentration in all plants tested never exceeded the permissible level of 0.6 µg g-1 tissue.

Bioaccumulation of Trace Metals in Plants Grown in Sewage Sludge Amended Soil