The corrosion inhibition of zinc in hydrochloric acid by extract of Nypa Fruticans Wurmb was studied using weight loss techniques. Maximum inhibition efficiency (and surface coverage) was obtained at an optimum concentration. However increase in temperature decreased the inhibition efficiency at the temperature range studied. The inhibition action of Nypa Fruticans Wurmb extract compared closely to that of 1, 5 Diphenyl Carbazone (DPC). Optimum inhibition efficiency for zinc in the presence of Nypa Fruticans Wurmb extract was 36.43% and 40.70% with DPC. The phenomenon of physical adsorption has been proposed from the activation energy values (19.33 kJ mol -1 and 21.11 kJ mol -1 ) with Nypa Fruticans Wurmb extract and DPC respectively. A first order kinetics has been deduced from the kinetic treatment of the results. The heat of adsorption, Q ad range from (-33.63 to -58.52 kJ mo l -1 ) for both additives studied. Mean ∆G o ads values (-7.82 to 8.68 kJ mol -1 ) are negative and suggestive of adsorption on metal surface. The data obtained from this study fits well into the Langmuir isotherm. Evidence is hereby provided to show that Nypa Fruticans Wurmb extract and DPC inhibits the corrosion of zinc comparatively @ JASEM

The concentration of silver in some photographic wastes (photographic solution, stabilizer solution and photographic films) has been determined in this study. Plantain ash solution (PAS) of different concentrations was used as solution for stripping the films and as extractant for the photographic solutions. Products obtained were analysed for silver content. The concentration of silver was measured using UV-visible spectrophotometer at a wavelength of 380nm, path length 1cm using silver nitrate for calibration. Results obtained revealed that plantain ash solution extracted silver from the various wastes in all the concentrations of PAS used. However the silver content was observed to be highest in the photographic film and fixer solution and lowest for stabilizer solution in the particular instance. In all the photographic wastes studied, it was observed that although more products were recovered by using higher concentrations of PAS, higher concentrations of silver ions were obtained when lower concentrations of PAS were used (0.1500 -0.8450M ). Therefore lower concentrations of PAS can be used for leaching of photographic wastes of silver.