Organic Iodine Compounds in Fine Particulate Matter from a Continental Urban Region: Insights into Secondary Formation in the Atmosphere

Shi, Xiaodi; Qiu, Xinghua; Chen, Qi; Chen, Shiyi; Hu, Min; Rudich, Yinon; Zhu, Tong

doi:10.1021/acs.est.0c06703

Cited by 15 publications

(18 citation statements)

References 38 publications

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“…It implies that HIOx concentration is not promoted by pollution in cold season. A previous 2-year 435 measurements conducted in Beijing show that high loadings of particulate organic iodine compounds (OICs) occurred in the heating season, and HOI was thought to be the key oxidant to form the OICs (Shi et al, 2021). The different seasonal distribution between gaseous HIOx in this study and particle-phase OICs indicates potentially different iodine sources of gaseous and particulate phases, which warrants further investigation.…”

Section: Iodine Sources 420mentioning

confidence: 62%

Iodine oxoacids and their roles in sub-3 nanometer particle growth in polluted urban environments

Zhang

et al. 2023

Preprint

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Abstract. New particle formation processes contribute significantly to the number concentration of ultrafine particles (UFP), and have great impacts on human health and global climate. Iodine oxoacids (HIOx, including iodic acid, HIO3 and iodous acid, HIO2) have been observed in pristine regions and proved to dominate NPF events at some sites. However, the knowledge of HIOx in polluted urban areas is rather limited. Here, we conducted a long-term comprehensive observation of gaseous iodine oxoacids and sulfuric acid in Beijing from January 2019 to October 2021 and also in Nanjing from March 2019 to February 2020, and investigated the contribution of HIOx to UFP number concentration in urban environments. HIO3 concentration is highest in summer, up to 2.85×106 cm-3 and 2.78×106 cm-3 in Beijing and Nanjing, respectively, and is lowest in winter, with a more prominent seasonal variation than H2SO4. HIO3 concentration shows a clear diurnal pattern at both sites with a daily maximum at around noontime, similar to the atmospheric temperature, radiation and ozone (O3) levels. HIO2 concentration has the same diurnal and seasonal trend as HIO3 but is overall about one order of magnitude lower than HIO3 concentration. Back trajectory analysis suggests that the sources for inland iodine species could be a mix of marine and terrestrial origins, both having peak iodine emission in warm seasons. While the contribution of HIO2 to particle growth is marginal in Beijing and Nanjing, our results demonstrate that HIO3 enhances the particle survival probability of sub-3 nm particles by about 40 % (median) and occasionally by more than 100 % in NPF events, suggesting HIOx are non-negligible contributor to UFPs in polluted urban areas. As the growth contribution from HIO3 and H2SO4 is similar on a per-molecule basis, we propose that the sum of HIO3 and H2SO4 could be used to estimate sub-3 nm particle growth of inorganic acid origin, in the polluted atmospheres with a significant amount of HIOx.

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Section: Iodine Sources 420mentioning

confidence: 62%

Iodine oxoacids and their roles in sub-3 nanometer particle growth in polluted urban environments

Zhang

et al. 2023

Preprint

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“…However, the NW10M display positive effect, this can be explained by the transport of sea salt particles from ocean in the north. In addition, several studies have reported that sea salts particles especially iodine particle contribute to PM 2.5 (Shi et al 2021 ). West Wind at 10 m (WW10M) the negative values of EW10M, show a positive effect which indicate the contribution of sea salt particles transported from the Mediterranean Sea.…”

Section: Resultsmentioning

confidence: 99%

Atmospheric pollutants response to the emission reduction and meteorology during the COVID-19 lockdown in the north of Africa (Morocco)

Sbai

Bentayeb

Yin

2022

Stoch Environ Res Risk Assess

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Climate and air quality change due to COVID-19 lockdown (LCD) are extremely concerned subjects of several research recently. The contribution of meteorological factors and emission reduction to air pollution change over the north of Morocco has been investigated in this study using the framework generalized additive models, that have been proved to be a robust technique for the environmental data sets, focusing on main atmospheric pollutants in the region including ozone (O 3 ), nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), particulate matter (PM 2.5 and PM 10 ), secondary inorganic aerosols (SIA), nom-methane volatile organic compounds and carbon monoxide (CO) from the regional air pollution dataset of the Copernicus Atmosphere Monitoring Service. Our results, indicate that secondary air pollutants (PM 2.5 , PM 10 and O 3 ) are more influenced by metrological factors and the other air pollutants reported by this study (NO 2 and SO 2) . We show a negative effect for PBHL, total precipitation and NW10M on PM (PM 2.5 and PM 10 ) , this meteorological parameters contribute to decrease in PM 2.5 by 9, 2 and 9% respectively, before LCD and 8, 1 and 5% respectively during LCD. However, a positive marginal effect was found for SAT, Irradiance and RH that contribute to increase PM 2.5 by 9, 12 and 18% respectively, before LCD and 17, 54 and 34% respectively during LCD. We found also that meteorological factors contribute to O 3 , PM 2.5 , PM 10 and SIA average mass concentration by 22, 5, 3 and 34% before LCD and by 28, 19, 5 and 42% during LCD respectively. The increase in meteorological factors marginal effect during LCD shows the contribution of photochemical oxidation to air pollution due to increase in atmospheric oxidant (O 3 and OH radical) during LCD, which can explain the response of PM to emission reduction. This study indicates that PM (PM 2.5 , PM 10 ) has more controlled by SO 2 due to the formation of sulfate particles especially under high oxidants level. The positive correlation between westward wind at 10 m (WW10M), Northward Wind at 10 m (NW10M) and PM indicates the implication of sea salt particles transported from Mediterranean Sea and Atlantic Ocean. The Ozone mass concentration shows a positive trend with Irradiance, Total and SAT during LCD; because temperature and irradiance enhance tropospheric ozone formation via photochemical reaction.This study shows the contribution of atmospheric oxidation capacity to air pollution change. Supplementary Information The online version co...

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“…The campaign reporting dominant NSI took place in a coastal location, but not in open ocean waters, and with some influence of continental air (Risø, Denmark, S35). Recent work has demonstrated the presence of abundant NSI compounds in a continental location related to anthropogenic activities (Shi et al., 2021 ).…”

Section: Discussionmentioning

confidence: 99%

On the Speciation of Iodine in Marine Aerosol

et al. 2022

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Iodine has a profound impact on tropospheric chemistry through its role in ozone depletion, particle formation, and impact on the oxidative capacity (see Saiz-Lopez et al., 2012, and references therein). In a previous publication (Gómez Martín et al., 2021), we reported the spatial variability of total iodine (TI) in aerosol by compiling and homogenizing a comprehensive data set of field observations at open ocean, insular, and coastal locations and appending to it previously unpublished measurements, spanning a period of 55 years. The analysis of the latitudinal and longitudinal dependence of TI in aerosol provided for the first time observational evidence from the field showing that the dominant global source of atmospheric iodine to the atmosphere is the reaction between iodide and ozone on the sea-water interface (Carpenter et al., 2013). After uptake on particle surfaces, iodine undergoes a rich aqueous-phase chemistry, which is known to depend on the origin and chemical properties of the aerosol (e.g., acidity ) but still remains poorly understood. Iodine speciation determines whether recycling to the gas phase can proceed through formation of volatile species, which is thought to occur via iodide (I − ), or aerosol becomes essentially an atmospheric iodine sink through accumulation of species assumed to be stable and unreactive, that is, iodate (IO 3 − ; Vogt et al., 1999). However, current aerosol chemical schemes cannot explain the concentrations of I − , IO 3 − , and soluble organic iodine (SOI) observed in field campaigns. Models predict negligible concentrations of I − following recycling to the gas phase and high concentrations of IO 3 − ,

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Organic Iodine Compounds in Fine Particulate Matter from a Continental Urban Region: Insights into Secondary Formation in the Atmosphere

Cited by 15 publications

References 38 publications

Iodine oxoacids and their roles in sub-3 nanometer particle growth in polluted urban environments

Iodine oxoacids and their roles in sub-3 nanometer particle growth in polluted urban environments

Atmospheric pollutants response to the emission reduction and meteorology during the COVID-19 lockdown in the north of Africa (Morocco)

On the Speciation of Iodine in Marine Aerosol

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