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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12580

Title: Heavy metal contents of some medicinal herbs from Kumasi, Ghana
Authors: Nkansah, Marian Asantewah
Hayford, Samuel Takyi
Borquaye, Lawrence Sheringham
Ephraim, James Hawkins
Keywords: heavy metals
herbs
medicinal plants
contamination
Issue Date: 3-Oct-2016
Publisher: Cogent Environmental Science
Citation: Marian Asantewah Nkansah, Samuel Takyi Hayford, Lawrence Sheringham Borquaye & James Hawkins Ephraim (2016) Heavy metal contents of some medicinal herbs from Kumasi, Ghana, Cogent Environmental Science, 2:1, 1234660
Abstract: This research was conducted to assess the safety of herbs available in the Kumasi central market with regards to heavy metal contamination. A total of 15 medicinal herbs were randomly collected. The levels of iron (Fe), cadmium (Cd), lead (Pb) and zinc (Zn) were determined by atomic absorption spectrometry. The levels of the metals were in the range of 2.51–7.06 mg/kg for Fe, 0.44–0.89 mg/kg for Pb, 0.21–1.07 mg/kg for Zn and 0.11–0.53 mg/kg for Cd. This shows that most of the metal concentration levels in the herbs were within the WHO maximum permissible limits (WHO MPL) of 15 mg/kg for Fe, 100 mg/kg for Zn and 10 mg/kg for Pb. Four samples, however, had Cd levels above the WHO MPL of 0.3 mg/kg. There was a positive correlation between Cd and Zn. However, there was no correlation between the remaining metals. Considering the levels of heavy metals, the medicinal herb samples investigated are considered unsafe for human consumption.
Description: An article published by Cogent Environmental Science and also available at doi.org/10.1080/23311843.2016.1234660
URI: http://hdl.handle.net/123456789/12580
Appears in Collections:College of Science

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