Characterization of ionic composition of TSP and PM10 during the Middle Eastern Dust (MED) storms in Ahvaz, Iran

• DOI: 10.1007/s10661-011-2451-6
• Publication Date: 2011-12-06T06:28:52Z
• Authors: Abbas Shahsavani; Kazem Naddafi; Nematollah Jaafar...; Alireza Mesdaghinia; Masud Yunesian; Ramin Nabizadeh; Mohamad Arhami; Maryam Yarahmadi; Mohammad Hossein ...; Maryam Ghani; Ahmad Jonidi Jafari; Mahmood Alimohamadi; Seyed Abbas Motev...; Zahra Soleimani
• Keywords: Ions; Air Pollutants; Dust; Iran; 01 natural sciences; 13. Climate action; Air Pollution; Particulate Matter; Seasons; Cities; Particle Size; Environmental Monitoring; 0105 earth and related environmental sciences

Because of the recent frequent observations of major dust storms in southwestern cities in Iran such as Ahvaz, and the importance of the ionic composition of particulate matters regarding their health effects, source apportionment, etc., the present work was conducted aiming at characterizing the ionic composition of total suspended particles (TSP) and particles on the order of ∼10 μm or less (PM(10)) during dust storms in Ahvaz in April-September 2010. TSP and PM(10) samples were collected and their ionic compositions were determined using an ion chromatography. Mean concentrations of TSP and PM(10) were 1,481.5 and 1,072.9 μg/m(3), respectively. Particle concentrations during the Middle Eastern Dust (MED) days were up to four times higher than those in normal days. Ionic components contributed to only 9.5% and 11.3% of the total mass of TSP and PM(10), respectively. Crustal ions were most abundant during dust days, while secondary ions were dominant during non-dust days. Ca(2+)/Na(+) and Cl(-)/Na(+) ratios can be considered as the indicators for identification of the MED occurrence. It was found that possible chemical forms of NaCl, (NH(4))(2)SO(4), KCl, K(2)SO(4), CaCl(2), Ca(NO(3))(2), and CaSO(4) may exist in TSP. Correlation between the anionic and cationic components suggests slight anion and cation deficiencies in TSP and PM(10) samples, though the deficiencies were negligible.