NDLI: Urban Market Gardening in Africa: Foliar Uptake of Metal(loid)s and Their Bioaccessibility in Vegetables; Implications in Terms of Health Risks

Content Provider	Springer Nature Link
Author	Uzu, Gaëlle Schreck, Eva Xiong, Tiantian Macouin, Mélina Lévêque, Thibaut Fayomi, Benjamin Dumat, Camille
Copyright Year	2014
Abstract	Urban market gardening in Africa is suffering from increasing environmental contamination due to sources of contamination as varied as traffic, industry, and agriculture practices. A field study was therefore conducted to determine the global influence of the polluted environment (atmosphere, soil, and irrigation waters) on vegetable quality in a large urban-farming area. For leafy vegetables collected in 15 ha of squatted land belonging to the international airport of Cotonou, total concentrations of metal(loid)s measured in consumed parts of Lactuca sativa L. and Brassica oleracea were 52.6–78.9, 0.02–0.3, 0.08–0.22, 12.7–20.3, 1.8–7.9, and 44.1–107.8 mg kg$^{−1}$ for Pb, Cd, As, Sb, Cu, and Zn, respectively. Human gastric bioaccessibility of the metal(loid)s was measured, and the obtained values varied according to the considered metal(loid) and the plant species. The results identified values that are commonly found in non-polluted soils and roots associated with contaminated edible parts, raising the possibility of atmospheric contamination. Such a hypothesis is in agreement with values of magnetic susceptibility, since iron oxides and probably their associated metal(loid)s do not translocate from the roots toward the upper parts of the plants. (Bioaccessible) estimated dose intake ((B)EDI) and total (bioaccessible) target hazard quotient (Σ(B)THQ) were calculated to assess the health risk of consuming vegetables from this area. Pb and Sb were the major risk contributors. Taking the bioaccessible fractions into account, ΣBTHQ values were lower than ΣTHQ but were all still >1 for both males and females, leading to the conclusion that consuming these vegetables from this area is not risk-free.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	225
Issue Number	11
e-ISSN	15732932
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-10-31
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metal(loid)s Foliar uptake Bioaccessibility Lactuca sativa L. (lettuce) Brassica oleracea (cabbage) Target hazard quotient Magnetic susceptibility Environment Water Quality/Water Pollution Atmospheric Protection/Air Quality Control/Air Pollution Soil Science & Conservation Hydrogeology Climate Change/Climate Change Impacts
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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