Abstract
An investigation covering 12 districts of Baghdad city was conducted over 2 yr to monitor the effect of domestic storage practice on the quality of drinking water. Water storage tanks are widely used in Iraq as an additional water source. Tap and stored waters were tested for their chemical constituents i.e. Ca, Mg, Na, K, Cl, Zn, Fe, Pb, Cd, and total hardness (T.H.). All the tested elements were within the permissible limits. However, statistical analysis showed a significant variation between the different districts for T.H., Cu, Mg and chloride for both tap and stored waters. Seasonal variations have a significant effect on the levels of some elements. The quality of stored water was not affected by storage practice. Zinc, Pb and Fe were the only elements that showed some variation in the stored waters. This was attributed to the effects of corrosion of the tank metal and the migration of metals from the distribution system.
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