ABSTRACT
Corrosion is one of the most complex and costiy problems related to drinking water. Corrosion can affect the public health, acceptability of the drinking water source and supplying costs. The aim of this study was to determine the corrosion potentiality of drinking water in Shiraz city in 2007- 2008 through corrosion and stability index [Langlier Saturation Index, Ryznar Stability Index, Aggressiveness Index and Pockurius Scaling Index]. The results indicate the mean and standard deviation for temperature, pH, and pHs were equal to 22.84 and 2.93 °C, 7.69 and 0.28, and 6.83 and 0.24 respectively. Also the mean and standard deviation of total suspended solid [TDS], calcium hardness, and total alkalinity was equal to 656.8 and 190.9, 465.37 and 121, and 271.6 and 67 respectively. Also Langlier Saturation Index was equal to 0.86 and 0.23, respectively and for Ryznar Stability Index [RSI] was equal 5.95 and 0.36, respectively. Obtained results showed that the mean and standard deviation for Aggressiveness Index [AI] and Pockurius Scaling Index [PSI] was equal to 10.54 and 0.23, and 8.06 and 0.15, respectively. By studying the corrosion indexes it was found that most of these indexes in Shiraz drinking water have scaling potentiality and only in a few instances station have corrosion potentiality