Survey of nitrate and nitrite concentrations in villages of Sari well-waters

Due to carcinogenic and other hazardous effects of nitrate and nitrite this study has been done. The Objective of this study was survey of nitrate and nitrite concentration at well-waters in villages of Sari city in 2008-2009 and comparison them with standard levels. In this study, 152 water samples from 38 rural well-water supply facilities in each year have been surveyed. Nitrate and nitrite ions concentration were determined by DR-5000 spectrophotometer and then results have been analyzed by descriptive and analytical statistical methods using SPSS 16.Result showed nitrate and nitrite average concentrations respectively were 1.42 ± 0.571 and 0.004 ± 0.00141 mg/L in 1386 and their average concentrations were 1.24 ± 0.461 and 0.0081 ±0.0072 mg/L in 1387 respectively.Nitrate and nitrite average concentrations in the experimented samples were less than recommended permissible concentration level of WHO and water quality standard of Iran (10 and 1 mg/L respectively) and had no hygienic threat in region, But wastewater disposal in seepage wells may cause increase of nitrate and nitrite concentrations in the future.