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Journal Article
Research Support, Non-U.S. Gov't
Natural Lead Levels in Dandelions ( Taraxacum officinale): A Weed, Folk Medicine, and Biomonitor.
Environmental Science & Technology 2019 January 16
The natural lead concentration of dandelion ( Taraxacum officinale) leaves is estimated to be 0.2 μg/g (dry weight), or 1-3 orders of magnitude below most contemporary measurements of that value for dandelions and other plants. This estimate is based on analyses of lead concentrations of dandelions grown in a trace metal clean laboratory, with environmental lead concentrations approximating natural levels. The protocols used in this study paralleled those in our previous study that estimated the natural blood lead level in humans (0.016 μg/dL), which is also 1-3 orders of magnitude below most contemporary measurements. Analyses of the isotopic ratios (206 Pb/207 Pb:208 Pb/207 Pb) of the lead in the plants grown in the laboratory and greenhouse and those collected in the field, as well as the isotopic ratios of the soils the plants were grown in in the laboratory, indicate that anthropogenic lead makes up a substantial amount of labile lead in today's environments. Consequently, this estimate of the natural lead level in dandelion leaves provides both a benchmark for comparison of lead concentrations in contemporary plants and yet another measure of persistent lead contamination in the biosphere.
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