Impact of nylon and teflon filter media on the sampling of inorganic aerosols over a high altitude site DOI Creative Commons
Le Yang, Pawan S. Soyam, Rohit P. Patil

и другие.

Environmental Advances, Год журнала: 2023, Номер 12, С. 100373 - 100373

Опубликована: Май 1, 2023

Water-soluble inorganic aerosols constitute major fraction of PM2.5 play an important role in the Earth-climate system and affect adversely on human health. However, their measurement accuracy highly vary depending choice filter media denuder usage. In most cases, denuders are either not deployed or use is partially limited to removal certain gases. Therefore, understand impact undenuded ambient sampling type depositional loading water-soluble aerosols; three (1 teflon 2 nylon based) different pore-sized was carried at a high altitude location Western Ghats during winter season. Results show gas-phase adsorption higher than hydrophobic membrane. Decreased pH overall increased conductivity observed suggested acidic species. Nylon showed increasing ionic concentration order followed Mg2+Na+>Ca2+>K+. ISORROPIA-II derived NH3 Cl(g) found teflon. Poor correlation between X-ray Fluorescence (XRF) Ion Chromatography (IC) crustal specie (Ca) showing off-set both results, however, positively correlated for secondary species (Cl−, NH4+, NO3+ SO42−). Neutralization efficiency revealed NH4+ as main neutralizer SO42− whereas teflon, Ca2+ be neutralizing component. On comparing Na+ Cl+ effects over neutralization, extensive prevalence non-seasalt sources. Concentration weighted trajectory analysis minus indicated excess semi-volatiles NO3− NH4+) mostly driven by oxidation precursory gases originating from local nearby coastal cities, non-refractory ultrafine mode inland majorly polluted North Indian region.

Язык: Английский

Current challenges in the visibility improvement of urban Chongqing in Southwest China: From the perspective of PM2.5-bound water uptake property over 2015–2021 DOI

Yuhang Hao,

Yafeng Gou,

Zhenshuai Wang

и другие.

Atmospheric Research, Год журнала: 2024, Номер 300, С. 107215 - 107215

Опубликована: Янв. 3, 2024

Язык: Английский

Процитировано

2
Measurement report: Hygroscopicity of size-selected aerosol particles in the heavily polluted urban atmosphere of Delhi: impacts of chloride aerosol DOI Creative Commons
Anil Kumar Mandariya, Ajit Ahlawat, M. Danish Haneef

и другие.

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(6), С. 3627 - 3647

Опубликована: Март 22, 2024

Abstract. Recent research has revealed the crucial role of wintertime, episodic high chloride (H-Cl) emissions in Delhi region, which significantly impact aerosol hygroscopicity and aerosol-bound liquid water, thus contributing to initiation fog episodes. However, these findings have primarily relied on modeled hygroscopicity, necessitating validation through direct measurements. This study presents measurements non-refractory bulk composition PM1 from an Aerodyne chemical speciation monitor for first-time size-resolved hygroscopic growth factors (nucleation, Aitken, accumulated mode particles) along with their associated parameters at 90 % relative humidity using a tandem differential mobility analyzer Aerosol Supersite. Our observations demonstrate that parameter particles varies 0.00 0.11 (with average 0.03 ± 0.02) 20 nm particles, 0.05 0.22 (0.11 0.03) 50 0.30 (0.14 0.04) 100 0.41 (0.18 0.06) 150 0.56 (0.22 0.07) 200 particles. Surprisingly, our period H-Cl displays notably greater (0.35 comparison spans marked by biomass burning hydrocarbon-like organic (0.17 0.05) relatively cleaner periods (0.27 0.07). initial observational proof ammonium is main factor behind water content Delhi. The finding emphasizes chloride's aerosol–water interaction related haze/fog development. Moreover, levels aerosols seem prevent adverse concentrations cloud condensation nuclei activity.

Язык: Английский

Процитировано

2
Assessment of submicron aerosol liquid water content and mass-based growth factors in South Asian outflow over the Indian Ocean DOI
Suresh K. R. Boreddy, Vijayakumar S. Nair, S. Suresh Babu

и другие.

The Science of The Total Environment, Год журнала: 2023, Номер 901, С. 166461 - 166461

Опубликована: Авг. 20, 2023

Язык: Английский

Процитировано

5
Significant chlorine emissions from biomass burning affect the long-term atmospheric chemistry in Asia DOI Creative Commons
Di Chang, Qinyi Li, Zhe Wang

и другие.

National Science Review, Год журнала: 2024, Номер 11(9)

Опубликована: Авг. 13, 2024

Biomass burning (BB) is a major source of trace gases and particles in the atmosphere, influencing air quality, radiative balance, climate. Previous studies have mainly focused on BB emissions carbon nitrogen species with less attention chlorine. Reactive chlorine chemistry has significant effects atmospheric quality. However, quantitative information from BB, particularly long-term trend associated impacts, limited both regional global scales. Here, we report (2001-2018) high-resolution emission inventory for chlorine-containing compounds (HCl, chloride, CH

Язык: Английский

Процитировано

1
Impact of nylon and teflon filter media on the sampling of inorganic aerosols over a high altitude site DOI Creative Commons
Le Yang, Pawan S. Soyam, Rohit P. Patil

и другие.

Environmental Advances, Год журнала: 2023, Номер 12, С. 100373 - 100373

Опубликована: Май 1, 2023

Water-soluble inorganic aerosols constitute major fraction of PM2.5 play an important role in the Earth-climate system and affect adversely on human health. However, their measurement accuracy highly vary depending choice filter media denuder usage. In most cases, denuders are either not deployed or use is partially limited to removal certain gases. Therefore, understand impact undenuded ambient sampling type depositional loading water-soluble aerosols; three (1 teflon 2 nylon based) different pore-sized was carried at a high altitude location Western Ghats during winter season. Results show gas-phase adsorption higher than hydrophobic membrane. Decreased pH overall increased conductivity observed suggested acidic species. Nylon showed increasing ionic concentration order followed Mg2+Na+>Ca2+>K+. ISORROPIA-II derived NH3 Cl(g) found teflon. Poor correlation between X-ray Fluorescence (XRF) Ion Chromatography (IC) crustal specie (Ca) showing off-set both results, however, positively correlated for secondary species (Cl−, NH4+, NO3+ SO42−). Neutralization efficiency revealed NH4+ as main neutralizer SO42− whereas teflon, Ca2+ be neutralizing component. On comparing Na+ Cl+ effects over neutralization, extensive prevalence non-seasalt sources. Concentration weighted trajectory analysis minus indicated excess semi-volatiles NO3− NH4+) mostly driven by oxidation precursory gases originating from local nearby coastal cities, non-refractory ultrafine mode inland majorly polluted North Indian region.

Язык: Английский

Процитировано

3