Determination Of Trace Metals In Commercially Available Khat (catha Edulis Forsk) In Addis Ababa Graduate Project

Khat (Catha edulis Forsk) is a plant that grows in certain areas of East Africa and the ArabrnPeninsula. A large number of people in Ethiopia chew khat leaves because of its pleasurable andrnstimulating effects. In the present study the level of selected Trace metals ( Cu, Zn, Mn, Ni, Co,rnCr, Cd and Pb) in four different kinds of khat sampled from different khat shops in Adiss Abebarnwere analyzed. Known weights of oven dried Khat samples were digested by wet digestion usingrn3 mL of HNO3 ,1 mL of HCLO4 and 1 mL of H2O2 by setting the temperature first to 60 0C for 30rnmin and then increased to 210 0C for the next 2 h and 30 min. The contents of the minerals in therndigests were analysed using flame atomic absorption spectrometry. The following concentrationrnranges in dry weight (μg/g) were obtained in the khat samples: Cu (19.2 - 24.4); Zn (24.1 – 46.9);rnMn (14.92 – 20.6); Ni (4.7 – 7.7); Co (3.1 – 7.76); Cr (3.1 – 6.76); Cd (1.3 – 2.9) and Pb (4.8 –rn9.1). Among the essential metal analyted Zn was the most abundant one followed by Cu,Mn,andrnNi Whereas Co and Cr were less than Pb. Generally ‘Bahirdar’ Khat contained higherrnconcentration compared to Gelemso, Gurage and Wondo for the majority of the mineral nutrientsrnidentified. The tested four kinds of khat proved high variability (p

Get Full Work

Report copyright infringement or plagiarism