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Journal of Environmental and Public Health
Volume 2017 (2017), Article ID 1476328, 9 pages
Research Article

Investigation of Some Metals in Leaves and Leaf Extracts of Lippia javanica: Its Daily Intake

Department of Environmental Science, Bindura University of Science Education, Private Bag 1020, Bindura, Zimbabwe

Correspondence should be addressed to Kanda Artwell

Received 17 January 2017; Revised 9 May 2017; Accepted 30 May 2017; Published 11 July 2017

Academic Editor: Pam R. Factor-Litvak

Copyright © 2017 Kanda Artwell et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Consumption of plant extracts can be a source of essential elements or a route of human exposure to toxicants. Metal concentrations in leaves, leaf brew, and infusion of L. javanica collected from five sites were determined by atomic absorption spectrometry after acid and aqueous extraction. Estimated daily intakes of metals in extracts were compared with recommended dietary allowances. Total metal concentrations in leaves varied with sampling sites (): Mn > Fe > Cu > Cr > Pb for sites SS2–SS5. The highest metal concentrations in leaves were recorded for SS3 (Cu: and Mn: ), SS5 (Fe: ), SS2 (Pb: ), and SS4 (Cr:  mg/kg). Leaf infusion appeared to release higher Cu and Mn concentrations in leaves across sites (Cu: 21.65; Mn: 28.01%) than leaf brew (Cu: 11.95; Mn: 19.74%). Lead was not detected in leaf extracts. Estimated dietary intakes of Cr, Cu, Fe, and Mn were below recommended dietary allowances. A 250 ml cup of leaf infusion contributed 0.30–1.18% Cu and 4.46–13.83% Mn to the recommended dietary allowances of these elements per day. Lead did not pose any potential hazard when consumed in tea beverage made from brew and infusion of leaves of L. javanica.