Determination of Selected Metals in Commercially Available khat (Catha Edulis) in Bahir Dar City

Nigusie, Simegne

dc.contributor.author	Nigusie, Simegne
dc.date.accessioned	2021-12-30T07:37:06Z
dc.date.available	2021-12-30T07:37:06Z
dc.date.issued	2021-12-30
dc.identifier.uri	http://ir.bdu.edu.et/handle/123456789/12923
dc.description.abstract	Khat chewing is a common habit in Bahirdar city by some peoples. The levels of some selected metals (Cu, Fe, Zn, Pb, Cr and Cd) in five different varieties) commonly consumed in Bahirdar city were determined by flame atomic absorption spectrometry. Known weight of oven-dried khat samples were wet-digested using 6 mL of (72%) HNO3, 2 mL of (70%) HClO4 and 2 ml of H2O2 (30%) for 4 h and 15 min at a temperature of (110oC) using hot plate. The mineral contents were analyzed using flame atomic absorption spectrometer. The following concentrations ranges in dried-weight basis were recorded in decreasing order: Zn (25-54.7µg/g) > Cr (20.86–46.6 µg/g) > Fe (7.96–27.9 µg/g) > Cu (4.87– 18.9 µg/g) > Pb (7.2–23.2 µg/g) > Cd (Nd–9.87 µg/g). Detection of toxic elements like Cd and Pb in khat plant samples investigated might be related to possible applying of nitrate fertilizers. Pb was toxic metal which was detected in all the samples analyzed, but Cd was also toxic metal which was detected in three varieties of samples (Gordema, Meshentie, and Woramit) but not detected in Zenzelima and Zege. Calibration curves showed a good linearity for all elements (R2>0.9719). Recoveries were in the range of 80 % to 103 %.	en_US
dc.language.iso	en	en_US
dc.subject	Chemistry	en_US
dc.title	Determination of Selected Metals in Commercially Available khat (Catha Edulis) in Bahir Dar City	en_US
dc.type	Thesis	en_US