Cover Image

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

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 const...

Full description

Saved in:
Bibliographic Details
Main Authors: Singh, Nandita, Banerjee, Tirthankar, Deboudt, Karine, Chakraborty, Abhishek, Khan, Md Firoz, Latif, Mohd Talib
Format: Article
Published: Amer Chemical Soc 2021
Subjects:
Q Science (General)
QD Chemistry
Online Access:http://eprints.um.edu.my/28484/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.um.eprints.28484
record_format eprints
spelling my.um.eprints.284842022-08-11T06:13:24Z http://eprints.um.edu.my/28484/ Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain Singh, Nandita Banerjee, Tirthankar Deboudt, Karine Chakraborty, Abhishek Khan, Md Firoz Latif, Mohd Talib Q Science (General) QD Chemistry 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%). Amer Chemical Soc 2021-08-19 Article PeerReviewed 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 https://doi.org/10.1021/acsearthspacechem.1c00130 <https://doi.org/10.1021/acsearthspacechem.1c00130>. 10.1021/acsearthspacechem.1c00130
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic Q Science (General)
QD Chemistry
spellingShingle Q Science (General)
QD Chemistry
Singh, Nandita
Banerjee, Tirthankar
Deboudt, Karine
Chakraborty, Abhishek
Khan, Md Firoz
Latif, Mohd Talib
Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain
description 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%).
format Article
author Singh, Nandita
Banerjee, Tirthankar
Deboudt, Karine
Chakraborty, Abhishek
Khan, Md Firoz
Latif, Mohd Talib
author_facet Singh, Nandita
Banerjee, Tirthankar
Deboudt, Karine
Chakraborty, Abhishek
Khan, Md Firoz
Latif, Mohd Talib
author_sort Singh, Nandita
title Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain
title_short Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain
title_full Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain
title_fullStr Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain
title_full_unstemmed Sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain
title_sort sources, composition, and mixing state of submicron particulates over the central indo-gangetic plain
publisher Amer Chemical Soc
publishDate 2021
url http://eprints.um.edu.my/28484/
_version_ 1744649118241783808
score 13.211869

Similar Items