The concentration of atmospheric sulphur (IV) oxide in Sokoto Metropolis was determined by sucking air in hydrogen peroxide solution, followed by the photometric determination of the sulphates ion formed. The overall mean concentration obtained (0.270+0.051 mg/m 3) exceeds the recommended WHO daily guideline value of 0.125 mg m −3 and maximum annual level of 0.050 mg m −3 (WHO 2000).

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Cyclohexene was oxidized using chromium (VI) oxide (CrO 3 ) in pure acetic acid medium. The products of oxidation were analysed using simple qualitative analysis, IR spectroscopy and Gas chromatography-Mass spectrometry (GC/MS). Kinetics studies were carried out to determine the order of reaction, rate constant and the activation energy with respect to the oxidant using pseudo-order approximation method. The influence of Cu 2+ , Co 2+and Fe 2+ as catalysts were also investigated. Qualitative analyses of the products revealed the presence alcohols and ketones while the GC/MS shows the presence of cyclohexanol (2.46%), cyclohexanone (5.05%), 2-cyclohexen-1-one (59.37%), 1,2-cyclohexanediol monoacetate (9.88%), 2-hydroxy-cyclohexanone (1.75%) and bi-2-cyclohexen-1-yl (5.16%). The reaction order was shown to be 2 nd order with respect to the CrO 3 with activation energy of 45.32 kJ mol -1 while Co 2+ and Fe 2+ indicated some catalytic activity on the reaction.