title: Corrosion and scaling potential in drinking water distribution system of tabriz, northwestern iran.
abstract: BACKGROUND
  This paper discusses the corrosion and scaling potential of Tabriz drinking water distribution system in Northwest of Iran. Internal corrosion of piping is a serious problem in drinking water industry. Corrosive water can cause intrusion of heavy metals especially lead in to water, therefore effecting public health. The aim of this study was to determine corrosion and scaling potential in potable water distribution system of Tabriz during the spring and summer in 2011.
  
  
  METHODS
  This study was carried out using Langlier Saturation Index, Ryznar Stability Index, Puckorius Scaling Index, and Aggressiveness indices. Eighty samples were taken from all over the city within two seasons, spring, and summer. Related parameters including temperature, pH, total dissolved solids, calcium hardness, and total alkalinity in all samples were measured in laboratory according to standard method manual. For the statistical analysis of the results, SPSS software (version 11.5) was used
  
  
  RESULTS
  The mean and standard deviation values of Langlier, Ryznar, Puckorius and Aggressiveness Indices were equal to -0.68 (±0.43), 8.43 (±0.55), 7.86 (±0.36) and 11.23 (±0.43), respectively. By survey of corrosion indices, it was found that Tabriz drinking water is corrosive.
  
  
  CONCLUSIONS
  In order to corrosion control, it is suggested that laboratorial study with regard to the distribution system condition be carried out to adjust effective parameters such as pH.
authors.affiliation: Department of Environmental Health Engineering, Faculty of Health and Nutrition, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Hassan
authors.initials: H
authors.lastname: Taghipour
authors.affiliation: Department of Environmental Health Engineering, Faculty of Health and Nutrition, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Shakerkhatibi
authors.affiliation: Student Research committee; Department of Environmental Health Engineering, Faculty of Health and Nutrition, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Pourakbar
authors.affiliation: M.A Student of Geographic Information Systems & Remote Sensing, Tabriz University, Tabriz, Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Belvasi
keywords: Corrosion indices; Corrosion potential; Drinking water; Iran; Scaling