A study of soil contamination and plant lead uptake in Boston urban gardens

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Abstract
Many soil samples were analyzed by X-ray fluorescence spectroscopy from backyard and play areas, and from large community gardens and playgrounds. An average Pb level of 800 ppm was found in about 900 soil samples. The elevated Pb levels were traceable to past widespread use of Pb paint. Tissues of selected plant species grown in garden soils containing Pb levels of 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. The soil was probably the sole source of Pb in this study, indicating positive translocation of Pb from soil into plant tissue.