The study of relation between aerosols and quality of rain water over Tehran during 2012-2013 years

Subject Areas : environmental management

Dina Abdemanafi ¹ , Amir-Hussain Meshkatee ² , Sohrab Hajjam ³ , Majid Vazifedoust ⁴

1 - - Ph.D. student, Department of Meteorology, College of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran. *(Corresponding Author)
2 - - Associate Professor, Department of Meteorology, College of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran.
3 - Associate Professor, Department of Meteorology, College of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran.
4 - Assistant Professor, Water Engineering Group, University of Guilan, Guilan, Iran.

Received: 2015-06-04 Accepted : 2015-07-16 Published : 2017-03-21

Keywords: Aerosol, Chemistry of precipitation, Scavenging, Source Identitification, Tehran city,

Abstract :

Background and Objective:  Precipitation is one of the most efficient mechanisms for washing the atmospheric pollutants, specifically particulate ones out.The study chemistry of rain water was shown pollutions in atmosphere. Method: Accordingly, to do that 16 rainwater samples from two Mehrabad and Aghdasieh synoptic stations collected during the autumn and winter of 2012 and spring of 2013 (the city rainy seasons). Concentrations of major inorganic ions () and pH in bulk precipitation samples collected in the Tehran city of I.R. of Iran were analyzed.  In this article, Enrichment Factors, Correlation Analysis and Principal Component Analysis had been used in order to identify the sources of ions found in sampled rain waters. Findings: Results show that concentrations of the found substances were higher over the Mehrabad station. The mean concentration of ions indicated that,,  and were the main anions, while   ,, were the main cations.  anion had important role in acidity of the rain water. The Bicarbonate anion had the highest concentration, among all other ions, over both stations and plays an important role in reduction of the acidity of the rain water. Study upon the potential sources of the ions over Tehran by means of Correlation  Analysis, Enrichment Factor and Principle Component Analysis indicate that existence of Qom salt lake and desert in the south of the city were the main source of the  and. There are anthropogenic sources for. The other ions  were from anthropogenic and dust origin. Discussion and Conclusion: The pollutants in rainwater over Tehran were derived from long range and local (industry and traffic) sources.

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