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Representative samples of Cassia occidentalis were randomly collected from three selected sites in Katsina and Batagarawa local government areas of Katsina state. The samples were prepared using standard procedures. The concentrations of chromium, copper, nickel, cobalt, iron, manganese, zinc, and lead were determined using atomic absorption spectroscopy(AAS) after ashing the samples in a muffle furnace at 550 0 C for 4 hours. The percentage moisture content was found to be 77.98%, 71.08%, and 75.45% in the samples collected from sites A, B and C respectively. The concentration of chromium ranged from 0.714±0.01 to 1.429±0.01mg/kg, copper(1.25±0.01 to3.75±0.04mg/kg), nickel(1.190±0.02 to 4.762 ±0.03 mg/kg), cobalt (4.032±0.04 to 7.258±0.06mg/kg), iron(10.417±0.37 to 41.667±6.07mg/kg), manganese(0.926±0.16 to1.852±0.65mg/kg), zinc (7.955±1.28 to 15.909±3.12mg/kg) and lead from 0.127±0.02 to 0.131±0.01mg/kg. All the values with the exception of nickel in site B and iron in site A were below the maximum permissible limit for medicinal plants. ANOVA indicated no significant difference P>0.05 in the concentration of metals in the different sites studied. It was concluded that the concentration of heavy metals in medicinal plants should be regularly monitored and checked before use for medication. In this study the levels of Cr, Cu, Pb, Ni, Co, Fe, Mn and Zn in the leaves of Cassia occidentalis from three selected sites in Katsina state were determined. Sample Collection Representative plant samples were randomly collected from three sites in Katsina and Batagarawa local governments of Katsina state. Site A is within a residential area in Katsina metropolis, site B is around a low activity area in Batagarawa local government and site C is within a densely populated school also in. Batagarawa local government. Six replicate samples were collected in each sampling location within an area of 4m 2 . The samples were mixed to form a composite and transported in labeled brown envelopes to the laboratory

Trace Metal Contents in the Leaves of Cassia occidentalis Linn from Some Selected Sites in Katsina, Nigeria