Plant uptake of CCA components from contaminated soil
P A Cooper, E Jasonek, J-P Aucoin
The above ground portions of lettuce and rye grass grown in CCA contaminated soil collected at the base of CCA-C treated poles in service did not absorb appreciable amounts of copper, chromium and arsenic, even at soil concentrations above the recommended levels for soil remediation for agricultural uses. At high soil arsenic levels whole radish plants absorbed more As, but not the other elements. The uptake of all elements by the root portion of rye grass increased with increased soil contaminant levels. The Cr, Cu and As content of lettuce roots was more than double that of the leaves and for copper appeared to increase with increasing soil concentration. Natural growing horsetails (Equisetum) accumulated all three elements in proportion to the soil concentration; cattails did not accumulate the elements appreciably and grass growing close to CCA treated poles had relatively higher concentrations of Cr and As compared to other plants.