Abstract
Two metal tolerant plants, Thlaspi caerulescens J. and C. Presl. (hyperaccumulator), and Silene vulgaris L. (indicator) were grown with Paris Island Cos Romaine lettuce (Lactuca sativa var. longifolia) on longterm sewage sludge plots. Metal uptake patterns by plants in relation to total soil metal and soil pH were examined. The 2-year study used four treatments and two pH levels. Zinc and Cd uptake were measured. Zinc and Cd for Silene and lettuce were as expected with increasing plant concentration in the more contaminated treatments and lower pH levels. Thlaspi followed the same pattern for Cd but not for Zn. Concentrations of Cd were not significantly different between Thlaspi and the other plants. Zinc concentrations in Thlaspi (2000 and 4000 mg kg -1 ) were 10-fold greater than in Silene. They showed no relation to available soil Zn. Although Thlaspi appears to hyperaccumulate Zn on mildly contaminated soils, Cd uptake follows predictable patterns.
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