Abstract
Lead (Pb) was detected in potential urban garden soil in Claremont Cali-fornia and was absorbed by radish cultivars and giant red mustard in a bioassay of the contaminated soil. Radish cultivars grown in two soils with two lead salts developed the same lead tissue concentrations. In a subsequent study, Cultivar “Rudolf” accumulated less lead nitrate than cultivars “French Breakfast” and “White Beauty”. Cultivar “Rudolf” grew the least biomass likely accounting for its reduced Pb accumulation. All radish cultivars accumulated more lead when grown in clay vs. sand soil and radish Pb accumulation increased when the concentration of lead was increased in either soil type. The solubility of the lead ion used was not associated with Pb uptake by radish.
Highlights
Lead is a naturally occurring metal that is used in many industrial processes, some of which lead to contamination of urban environments
All radish cultivars accumulated more lead when grown in clay vs. sand soil and radish Pb accumulation increased when the concentration of lead was increased in either soil type
While Red Giant Mustard accumulated more lead that radish cultivars, it did not “hyper-accumulate” than concentrations above the level measured in the Claremont soil
Summary
Lead is a naturally occurring metal that is used in many industrial processes, some of which lead to contamination of urban environments. Lead may enter soils through atmospheric deposition, from dust near roadways, and from paint chips near buildings. Attempts to alleviate food insecurity of impoverished citizens in cities by “guerrilla farming” activists may be putting consumers of such foods at risk, especially when farming on “Brownfield” [6] sites previously contaminated with lead [4]. Those attempting food production in cities may be at risk for lead consumption and poisoning [7]
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