STUDY OF SOIL CONTAMINATION AND PLANT LEAD UPTAKE IN BOSTON URBAN GARDENS

This study has demonstrated a serious problem of Pb contamination in the normal environment of many urban residents. Many soil samples have been analyzed by X-ray fluorescence spectroscopy from backyard and play areas as well as from large community gardens and playgrounds. An average Pb level of 800 ppm was found in about 900 soil samples. The elevated Pb levels are definitely traceable to widespread use of Pb paint in the past. Tissues of selected plant species grown in garden soils containing Pb levels ranging from 100–2000 ppm showed differing affinities for Pb uptake. The amount of Pb found in tissues was generally related to the soil Pb concentration but was also organ or tissue related; fruits taking up less than roots and roots less than tops. Experimental design insured that the soil was probably the sole source of Pb in this study. This points to positive translocation of Pb from soil into plant tissue. © 1979, Taylor & Francis Group, LLC. All rights reserved.