In this investigation, the concentrations of sulphur dioxide gas in the near atmosphere at six (6) different heights (2m, 4m, 6m, 8m, 10m and 12m) were determined using Spectrophotometry and Direct Reading Air Sensor. A simple improvised techniquewhich is economical and easy to operate was designed and adopted. It yielded analytical reasonable results. The results showed that SO 2 gas is more concentrated (1.048ppm, 0.466ppm, 1.30ppm and 0.40) at ground levels (2 -4m high) than at higher levels (10 -12m high). Higher height concentrations were estimated as 0.629ppm, 0.210ppm, 0.65ppm and 0.34ppm. It therefore implied that the concentration of SO 2 gas decreases with height. Also critical in this study is the comparison of the two analytical techniques based on sensitivity and easy handling.

The inhibition of corrosion of Alpha-Brass (70% Cu, 30% Zn) coupons and Beta-Brass (60% Cu, 40% Zn) coupons in different concentrations of Hydrochloric acid solution (HCl) at room temperature by 1-phenyl-3-methylpyrazol-5-one (HPMP) and 1-phenyl-3-methyl-4-(p-Nitrobenzoyl)-pyrazol-5-one (HPMNP) was investigated, using weight loss technique. Generally, inhibition was found to increase with increasing inhibitor concentration. HPMNP inhibited the two Brasses better than HPMP, and Beta-Brass (60% Cu, 40% Zn) corroded faster than Alpha-Brass (70% Cu, 30% Zn). The inhibition was assumed to occur via adsorption of the inhibitor molecules on the metal surface. The effect of immersion time was also carefully followed to study the corrosion and inhibition phenomenon.