Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain

Singh, Nandita and Banerjee, Tirthankar and Deboudt, Karine and Chakraborty, Abhishek and Khan, Md Firoz and Latif, Mohd Talib (2021) Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain. ACS Earth and Space Chemistry, 5 (8). pp. 2052-2065. ISSN 2472-3452, DOI

Full text not available from this repository.


Submicron particulates, collected between 2015 and 2018 in an urban environment over the central Indo-Gangetic Plain, South Asia, were analyzed. Particulate concentration was typically high during winter (DJF, 115 50 tig m-3) and post -monsoon seasons (ON, 79 52 pg m-3). Submicron particulates constituted a major fraction (69%) of fine particulates (PM).,) without much seasonal discrepancies. Particulates were metal-enriched (17 6%) with signature of crustal and road dust resuspensions. Metal enrichment was evident specifically for Zn, Co, and Cr. Sulfate was the most robust ion contributing 10% ( 4%) of particulate mass followed by nitrate (6 3%) and ammonium (4 2%). Overall, water-soluble ions accounted for one-third of particulate mass mainly comprised secondary ones. The n-alkane homologues (C17 C35) showed prevalence of lowmolecular-weight (LMW) alkanes (<C25) with the carbon preference index (CPI) close to one (1.3 0.3) referring predominant contribution of burning of fossil fuels. Similarly, prevalence of LMVV fatty acids (<C20) with a high CPI (9.9) indicates emissions from residential cooking. The presence of dicarboxylic acids and phthalates with a vital signature of anthropogenic emissions was also traced. Strong enrichment of levoglucosan (600 388 ng m-3) was noted especially during peak biomass -burning episodes. Single -particle analysis indicates high abundance of carbonaceous particles (CPs) having both chain-like soot spherules and amorphous tar balls. These CPs were mostly pure, externally mixed against secondary particles for which the mixing state varied among the seasons. Source apportionment by an advanced receptor model indicates secondary aerosols and biomass -burning emissions as the major sources of submicron aerosols (43%), followed by resuspensions of mineral dusts (18%) and emissions from refuse/waste combustion (18%).

Item Type: Article
Funders: ASEAN-India SAMP;T Development Fund [CRD/2018/000011], Department of Science & Technology (India) Department of Science & Technology (DOST), Philippines [SR/WOS-A/EA-1012/2015], French National Research Agency (ANR) [ANR11-LABX-0005-01], Hauts de France" Regional Council, European Commission, IoE Faculty Incentive Grant [6031], Banaras Hindu University
Uncontrolled Keywords: Inorganic species; Levoglucosan; Mixing state; Receptor model; Secondary aerosols
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: Ms Zaharah Ramly
Date Deposited: 11 Aug 2022 06:13
Last Modified: 11 Aug 2022 06:13

Actions (login required)

View Item View Item