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Impact of an Urban Environment on Trace Element Concentrations in Domestically Produced Lettuce (Lactuca sativa L.)

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Abstract

Urban horticulture is gaining more and more attention in the context of sustainable food supply. Yet, cities are exposed to (former) industrial activities and traffic, responsible for emission of contaminants. Trace elements were monitored in soils located in the urban environment of Ghent (Belgium) and 84 samples of Lactuca satica L. lettuce grown on it. The effects of cultivation in soil versus trays, neighbouring traffic and washing of the lettuce before consumption were studied. The 0–30 cm top layer of soils appeared heterogenic in composition and enriched in Co, Cd, Ni and Pb within 10 m from the nearest road. Yet, no similar elevated concentrations could be found in the crops, except for As. Besides uptake from the roots, the presence of trace elements in the plants is also caused by the atmospheric deposition of airborne particulate matter on the leaf surface. Correlation analysis and principal component analysis (PCA) revealed that this latter transport pathway might particularly be the case for Pt, Pd and Rh. Concentrations of Cd did not exceed the 0.2 mg kg−1 (fresh weight) threshold for Cd in leafy vegetables set by the European Commission. Measurements to reduce the health risks include the washing of lettuce, which effectively reduced the number of samples trespassing the maximum Pb level of 0.3 mg kg−1 (fresh weight). Also, cultivation in trays resulted in a lower As content in the plants. Taking into account a vigilance on crop selection, cultivation substrate and proper washing before consumption are considered essential steps for safe domestic horticulture in urban environments.

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Acknowledgements

The authors would like to thank participants of the project and express their appreciation for the assistance by Diether Debuysscher, Vincent Deweerdt and the laboratory technicians of the Laboratory of Analytical Chemistry and Applied Ecochemistry.

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Authors and Affiliations

  1. Laboratory of Analytical Chemistry and Applied Ecochemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium

    Karel Folens & Gijs Du Laing

  2. Department of Plant Production, Faculty of Bioscience Engineering, Ghent University, 9000, Ghent, Belgium

    Marie-Christine Van Labeke

Authors
  1. Karel Folens
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  2. Marie-Christine Van Labeke
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  3. Gijs Du Laing
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Correspondence to Karel Folens.

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Folens, K., Van Labeke, MC. & Du Laing, G. Impact of an Urban Environment on Trace Element Concentrations in Domestically Produced Lettuce (Lactuca sativa L.). Water Air Soil Pollut 228, 457 (2017). https://doi.org/10.1007/s11270-017-3635-7

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  • DOI: https://doi.org/10.1007/s11270-017-3635-7

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