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Statistical analysis of arsenic contamination in drinking water in a city of Iran and its modeling using GIS
Authors:Fatemeh Sadeghi  Simin Nasseri  Mohammad Mosaferi  Ramin Nabizadeh  Masud Yunesian  Alireza Mesdaghinia
Institution:1.Center for Water Quality Research (CWQR), Institute for Environmental Research (IER),Tehran University of Medical Sciences,Tehran,Iran;2.Department of Environmental Health Engineering, School of Public Health,Tehran University of Medical Science,Tehran,Iran;3.Tehran,Iran;4.Tabriz Health Services Management Research Center,Tabriz University of Medical Sciences,Tabriz,Iran;5.Center for Air Pollution Research (CAPR), Institute for Environmental Research (IER),Tehran University of Medical Sciences,Tehran,Iran
Abstract:In this research, probable arsenic contamination in drinking water in the city of Ardabil was studied in 163 samples during four seasons. In each season, sampling was carried out randomly in the study area. Results were analyzed statistically applying SPSS 19 software, and the data was also modeled by Arc GIS 10.1 software. The maximum permissible arsenic concentration in drinking water defined by the World Health Organization and Iranian national standard is 10 μg/L. Statistical analysis showed 75, 88, 47, and 69% of samples in autumn, winter, spring, and summer, respectively, had concentrations higher than the national standard. The mean concentrations of arsenic in autumn, winter, spring, and summer were 19.89, 15.9, 10.87, and 14.6 μg/L, respectively, and the overall average in all samples through the year was 15.32 μg/L. Although GIS outputs indicated that the concentration distribution profiles changed in four consecutive seasons, variance analysis of the results showed that statistically there is no significant difference in arsenic levels in four seasons.
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