Uptake of acid pollutants by mineral dust and their effect on aerosol solubility

Saliba, Najat A.; Chamseddine, A.

doi:10.1016/j.atmosenv.2011.09.074

Cited by 16 publications

(13 citation statements)

References 63 publications

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“…Research studies highlighted the simultaneous increase of NO 3 À in PM 10 and PM 2.5 (particulate matter with aerodynamic diameters of <2.5 and <10 mm, respectively) and gaseous HONO concentrations during Saharan dust events (Wang et al, 2003;Saliba and Chamseddine, 2012), suggesting that mineral dust affects the conversion of nitrogen species into HONO in the troposphere. Laboratory studies suggest that HONO can be formed by the UVirradiated interaction of reactive nitrogen compounds (NO 2 , NO, HNO 3 ) with mineral-containing substrates such as titanium dioxide (TiO 2 ), silicon oxide (SiO 2 ), aluminium oxide (Al 2 O 3 ), calcium carbonate (CaCO 3 ), and real Saharan and Asian dust (Saliba et al, 2001;Usher et al, 2003, Cwiertny et al, 2008, Ndour et al, 2008, Ma et al, 2013.…”

Section: Photolysis/photoenhanced Surface Reactionsmentioning

confidence: 99%

Sources of atmospheric nitrous acid: State of the science, current research needs, and future prospects

Spataro

Ianniello

2014

Journal of the Air & Waste Management Association

105

107

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Nitrous acid (HONO) plays a key role in tropospheric photochemistry, primarily due to its role as a source of hydroxyl (OH) radicals via its rapid photolysis. OH radicals are involved in photooxidation processes, such as the formation of tropospheric 03 and other secondary atmospheric pollutants (peroxyacetyl nitrate/PAN] and secondary particles). Recent field and modeling studies have postulated the occurrence of a strong and unknown daytime HONO source, but there are still many significant uncertainties concerning the identification and formation mechanisms of these unknown sources. Up to now, five HONO formation pathways are known: direct emission, homogeneous gas-phase reactions, heterogeneous reactions, surface photolysis; and biological processes. In this review paper the HONO sources proposed to explain the observed HONO budget, especially during daytime, are discussed, highlighting the knowledge gaps that need further investigation. In this framework it is crucial to have available accurate and reliable measurements of atmospheric HONO concentrations; thus, a short description ofHONO measurement techniques currently available is also reported. The techniquesare divided into three basic categories: spectroscopic techniques, wet chemical techniques, and off-line methods.

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Section: Photolysis/photoenhanced Surface Reactionsmentioning

confidence: 99%

Sources of atmospheric nitrous acid: State of the science, current research needs, and future prospects

Spataro

Ianniello

2014

Journal of the Air & Waste Management Association

105

107

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“…Ca-rich mineral aerosols during the long-range transport has been documented in the literature (Wolf, 1984;Rastogi and Sarin, 2006;Saliba and Chamseddine, 2012). The chemical uptake of acidic species enhances the solubility of Ca-rich minerals such as carbonates and apatite (Ca 3 (PO 4 ) 2 ), and hence mineral dust is considered as a significant source of P Inorg from ambient aerosols.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric pathways of phosphorous to the Bay of Bengal: contribution from anthropogenic sources and mineral dust

Bikkina¹,

Sarin

2012

Tellus B: Chemical and Physical Meteorology

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The continental outflow from the Indo-Gangetic Plain and Southeast Asia, during the late NE monsoon (January–March), dominates the transport of chemical constituents to the marine atmospheric boundary layer (MABL) of the Bay of Bengal (BoB). During the rest of the year, prevailing wind regimes and meteorological conditions do not favour the atmospheric transport of continental products. Here we report on the spatio-temporal variability of inorganic phosphorous (PInorg=PO3−4) in the MABL and its dry-deposition flux to the surface BoB. On the basis of the abundance of PInorg in PM2.5 (0.1–0.8 nmol m−3) and PM10 (0.3–2.8 nmol m−3), we document its dominant occurrence in the coarse mode (Da≥2.5 µm). The analytical data also provide evidence for the chemical processing of mineral dust by acidic species and mobilisation of PInorg during the long-range atmospheric transport. However, significantly high PInorg/non-sea-salt Ca2+ ratios over the BoB suggest dominant contribution from anthropogenic sources (fertilisers and biomass burning emissions). PInorg concentration over the Arabian Sea is about 4 to 5 times lower and is primarily associated with the mineral dust from desert regions. The dry-deposition flux of PInorg to the BoB varies by one order of magnitude (0.5–5.0 µmol P m−2 d−1; Av: 0.02 Tg P yr−1). These results have implications to the air-sea deposition of phosphorous over oceanic regions downwind of the pollution sources and impact on the biogeochemistry of surface waters

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“…Due to the chemical affinity of nitrogen oxides and nitric acid with dust particles (Hanisch and Crowley, 2001;Mogili et al, 2006;Saliba and Chamseddine, 2012;Song et al, 2013;Usher et al, 2003), such a change in the atmospheric environment of China suggests that dust particle behavior might also be changing compared to the situations 10 years ago. Therefore, it is necessary to investigate the present physicochemical properties of airborne particles in the country during dusty periods.…”

Section: Introductionmentioning

confidence: 99%

Evolution of aerosol chemistry in Xi'an, inland China, during the dust storm period of 2013 – Part 1: Sources, chemical forms and formation mechanisms of nitrate and sulfate

et al. 2014

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Abstract.A total suspended particulate (TSP) sample was collected hourly in Xi'an, an inland megacity of China near the Loess Plateau, during a dust storm event of 2013 (9 March 18:00−12 March 10:00 LT), along with a sizeresolved aerosol sampling and an online measurement of PM 2.5 . The TSP and size-resolved samples were determined for elemental carbon (EC), organic carbon (OC), watersoluble organic carbon (WSOC) and nitrogen (WSON), inorganic ions and elements to investigate chemistry evolution of dust particles. Hourly concentrations of Cl − , NO We propose a mechanism to explain these observations in which aqueous phase of dust particle surface is formed via uptake of water vapor by hygroscopic salts such as Na 2 SO 4 and NaCl, followed by heterogeneous formation of nitrate on the liquid phase and subsequent absorption of ammonia. Our data indicate that 54 ± 20 % and 60 ± 23 % of NH + 4 and NO − 3 during the dust period were secondarily produced via this pathway, with the remaining derived from the Gobi desert and Loess Plateau, while SO 2− 4 in the event almost entirely originated from the desert regions. Such cases are different from those in the East Asian continental outflow region, where during Asia dust storm events SO 2− 4 is secondarily produced and concentrates in sub-micrometer particles as (NH 4 ) 2 SO 4 and/or NH 4 HSO 4 . To the best of our knowledge, the current work for the first time revealed an infant state of the East Asian dust ageing process in the regions near the source, which is helpful for researchers to understand the panorama of East Asian dust ageing process from the desert area to the downwind region.

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Uptake of acid pollutants by mineral dust and their effect on aerosol solubility

Cited by 16 publications

References 63 publications

Sources of atmospheric nitrous acid: State of the science, current research needs, and future prospects

Sources of atmospheric nitrous acid: State of the science, current research needs, and future prospects

Atmospheric pathways of phosphorous to the Bay of Bengal: contribution from anthropogenic sources and mineral dust

Evolution of aerosol chemistry in Xi'an, inland China, during the dust storm period of 2013 – Part 1: Sources, chemical forms and formation mechanisms of nitrate and sulfate

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