The determination of proximate, caffeine and tannin contents of five different (China, Kenya, India, Srilanka and Mambilla) tea leaves samples sold in Kano markets was conducted. The moisture content was generally high in all the tea samples and ranged from 5.6% in Mambila to 7.5% in India samples. Ash content was relatively low and ranged between 4.90% in Srilanka to 7.20% in Mambila and Kenya samples respectively. Crude fibre ranged from 14.00% in China to 18.82% in Srilanka samples, while ether extract content was within the range of 9.30% to 10.60% with the highest value found in Mambila sample and the least value in Kenya sample. Total nitrogen contents were low when compared with other workers' results and ranged from 0.88% in Kenya to 1.75% in Mambila and Srilanka samples respectively. Caffeine and tannin contents were found to be 1.4% in Kenya to 2.80% in China, 6.00% in Mambilla to 7.80% in India samples respectively.

Tea leaves can be a source of mineral components and trace elements as well as some undesirable substances due to exposure to the environment. In this study, Mg, Fe, Ca, Zn, Mn, Cu and Pb were analyzed by Atomic Absorption spectrophotometer (AAS), K and Na were also determined by flame photometer. Among the metals analyzed, K was the most abundant, ranging from 30.00mg/dm 3 in china sample to 34.60 mg/dm 3 in Srilanka sample, followed by Mg with 9.03 mg/dm 3 in India sample to 9.21 mg/dm 3 in Srilanka sample. Ca, Mn, Fe, Zn, Na and Cu were also found in reasonable amounts. Fortunately, toxic heavy metal (Pb) had the lowest concentration in all the tea samples with concentration ranging from 0.04 mg/dm 3 in India and Srilanka samples to 0.09 mg/dm 3 in China sample.

This study determined the levels of three different sites within Gombe metropolis. at each sampling site using standard method. metals (As, Cr and Ni) using Atomic Absorption Spectrophotometer. The concentration of heavy metals ranged from 0.96-1.95 mg/kg for Cr, and 1.06-2.11 mg/kg at A site, 0.98 while the concentration of As was below detectable limit in all the study sites. The mean concentrations of the metals were compared with that of Department of Petroleum Resources (DPR, 2002) Standard values for Nigerian All the concentration of the metals studied were found to be below the DPR and WHO target values. Results of contamination factor (Cf) showed contaminated one with Cr and Ni being found with values greater than one. The values of Pollution Load Index obtained from these three sites (PLI <1) were less than 1 in all the studied sites, thus indicating perfection.