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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 50171 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Arhami, Mohammad
- Abstract:
- The PM2.5 particles are considered as one the most important pollutants of Tehran’s air due to their undesirable effect on health and environment. The particular matters which are in Tehran’s air are distributed from different sources. Because of lack of sufficient data about amount and chemical compounds of such matters in different areas, this study considers only concentration of particular matter and their composing elements in Sharif University, Tehransar, Mahalati, and Shahriyar station. By use of field measuring between 2015 to 2016 mass concentration of PM2.5 pollutant was calculated and then with the help of IC, GC/MS, and ICP chemical analysis which were conducted in University of Tehran, particular matters’ concentration of chemical compounds and metal elements were calculated in these stations. One of the composing elements of particular matters is elemental carbon measuring of which couldn’t be conducted in the country. Due to this, an instrument was made to measure this parameter and the parameter was measured. During the 45 days of sampling period, in each shift, a sample was taken on the Teflon filter. Amount of elemental carbon has been determined using optic dispersion analysis and the GCMS method has been used to derivate organic compound of the samples. ICP-MS analysis has also been used to determine metal concentration. Based on this, the average concentration of PM2.5 is 41.80 mg/m3 in the Sharif University zone, 40.32 µg/m3 in Tehransar station, 55.20 µg/m3 in Mahalati station, and 37.51 mg/m3 in Shahriyar station. Among organic compounds, the PAHs were investigated and it was shown that their concentration is higher in the cold months of the year. Concentration of Aluminum, Titanium and Manganese metal elements oxides is higher in June, July, and August than other months of the sampling period. Enrichment factors were calculated for measured metals in each station and it was determined that V, Fe, Ti, and Sr are less than 10 in both Tehransar and Shahriyar stations and the factors which are less than 10 are limited to Fe, Ti , and Sr in Mahalati and Sharif university stations. In general Shahriyar station’s enrichment factors are a lot different from other stations which states less human factor effect on this station’s air pollution. Moreover, very high magnitude of these factors for highly toxic metals in Mahalati station, states the crucial conditions in this station and so control strategies should be employed to reduce the distribution of such particles
- Keywords:
- Tehran ; Air Particulate Matter ; Organic Compounds ; Particulate Matter Less than 2.5 mm ; Elemental Carbon
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