The corrosion inhibition of mild steel in 0.1M H 2 SO 4 in presence of starch (polysaccharide) was studied using weight loss and potentiodynamic polarization measurements in the temperature range of 30-60 C. Starch inhibits the corrosion rates of mild steel to a considerable extent; the maximum inhibition efficiency (%IE) being 66.21% at 30 o C in presence of starch concentration of 200 ppm. The effect of the addition of very small concentration of sodium dodecyl sulfate and cetyl trimethyl ammonium bromide on the corrosion inhibition behavior of starch was also studied. The IE of starch significantly improved in presence of both the surfactants. The effect of surfactants on the corrosion inhibition behavior of starch appears to be synergistic in nature. Starch alone and in combination with surfactants is found to obey Langmuir adsorption isotherm from the fit of the experimental data of all concentration and temperature studied. Phenomenon of physical adsorption is proposed from the trend of IE with temperature and also the values E a , DG ads , and Q ads obtained
Nine domestic and three imported bottled water brands were analyzed in Saudi Arabia for various physicochemical water quality parameters. The results of the analysis were compared with the drinking water standards set by different regulatory agencies. The levels of different physicochemical parameters like pH, total dissolved solids (TDS), Ca, Mg, Na, K, NO(3), Cl, and SO(4) of all local and imported bottled water brands met the standards set by different regulatory agencies. Fifteen (15) trace metals viz. Al, As, Ba, Be, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Sr, Pb, and Zn were also analyzed in all the samples. Comparison of analyzed results with the reported label values showed considerable variation for different parameters. Variation was also recorded for the analyzed parameters for 3 bottles of the same bottled water brand, both for local and imported bottled waters. Zamzam water was also collected from Makkah Al Mukarrama from different locations and analyzed for various physical and chemical parameters. Bottled waters were also compared with the city municipal water supply and Zamzam water.
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