Heterogeneous chemistry of individual mineral dust particles from different dust source regions: the importance of particle mineralogy

Krueger, Brenda J.; Grassian, Vicki H.; Cowin, James P.; Laskin, Alexander

doi:10.1016/j.atmosenv.2004.07.010

Cited by 328 publications

(285 citation statements)

References 40 publications

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“…The contribution of unidentified matter (UM), estimated by taking difference of OM, EC and inorganic constituents from the TSP, is of the order of 40% at Hisar and ~50% at Allahabad. The unidentified matter mainly consists of mineral dust with dominant contribution from carbonate-rich minerals (such as CaCO 3 , MgCO 3 , dolomite [CaMg(CO 3 ) 2 ]), calcium sulphate (or Gypsum), and alumino-slilicates (Krueger et al, 2004;Rengarajan et al, 2007;. The high-level of Ca 2+ concentration in our samples (Table 2) and neutralization of acidic species by mineral aerosol (Table 3 and section 4.5) further attests our inference.…”

Section: Total Suspended Particulate Mattersupporting

confidence: 68%

“…Homogeneous oxidation processes involves the gas-phase reaction of SO 2 with OH radicals and is a temperature dependent process. On the other hand, heterogeneous oxidation reaction of SO 2 can take place on dust aerosol surfaces (Bauer et al, 2004;Krueger et al, 2004), aqueous transformation though catalytic oxidation (via H 2 O 2 /O 3 oxidation in the presence of Mn 2+ and Fe 3+ ) (Martin and Good, 1991;Seinfeld and Pandis, 1998;Tursic et al, 2004) and in-cloud scavenging processes (Warneck, 1999). It has been found that gas phase oxidation is more important prior to fog formation and heterogeneous oxidation take over after fog formation (Rattigan et al, 2001a, b).…”

Section: Sulphur and Nitrogen Oxidation Ratios (Sor And Nor)mentioning

confidence: 99%

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Carbonaceous and Secondary Inorganic Aerosols during Wintertime Fog and Haze over Urban Sites in the Indo-Gangetic Plain

Ram

Sarin

Sudheer

et al. 2012

Aerosol Air Qual. Res.

141

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The chemical composition of total suspended particulate (TSP) matter and secondary aerosol formation have been studied during wintertime fog and haze events from urban sites (Allahabad and Hisar) in the Indo-Gangetic Plain. The atmospheric abundances of elemental carbon (EC), organic carbon (OC), water-soluble OC (WSOC) suggest that organic matter is a major component of TSP, followed by concentrations of sulphate and nitrate under varying meteorological conditions. The concentrations of EC, OC, and WSOC show a nearly 30% increase during fog and haze events at Allahabad and a marginal increase at Hisar; whereas inorganic constituents (NH 4 + , NO 3 − and SO 4 2− ) are 2-3 times higher than those during clear days at both the locations. The sulphur and nitrogen oxidation ratios (SOR and NOR) also exhibit significant increases suggesting possible enhancement of secondary formation of SO 4 2− and NO 3 − during fog and haze events. The significant correlation between NH 4 + -SO 4 2− (R 2 = 0.66, n = 61) and an NH 4 + /SO 4 2− equivalent ratio ≥ 1 during fog-haze conditions suggest nearcomplete neutralization of sulphuric acid by ammonia. In contrast, NH 4 + /SO 4 2− equivalent ratios are less than 1 during normal days suggesting an NH 3 -deficient environment and the possible association of SO 4 2− with mineral dust for neutralization. Secondary inorganic aerosol formation and their hygroscopic growth can have significant impact on atmospheric chemistry, air-quality and visibility impairment during fog-haze events over northern India.

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Section: Total Suspended Particulate Mattersupporting

confidence: 68%

Section: Sulphur and Nitrogen Oxidation Ratios (Sor And Nor)mentioning

confidence: 99%

Carbonaceous and Secondary Inorganic Aerosols during Wintertime Fog and Haze over Urban Sites in the Indo-Gangetic Plain

Ram

Sarin

Sudheer

et al. 2012

Aerosol Air Qual. Res.

141

View full text Add to dashboard Cite

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“…[17] Krueger et al [2004] and Laskin et al [2005a] experimented on authentic dust in a laboratory and demonstrated that calcites (CaCO 3 ) can react with gaseous HNO 3 to form Ca(NO 3 ) 2 , which can then deliquesce even under conditions as dry as RH < 12%. Ca-rich spherical particles found frequently in the Beijing atmosphere might well be the modified product of carbonate formed in this manner.…”

Section: Spherical Mineral Dustmentioning

confidence: 99%

Morphological and chemical modification of mineral dust: Observational insight into the heterogeneous uptake of acidic gases

Matsuki

Iwasaka

Shi

et al. 2005

Geophysical Research Letters

117

112

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[1] Aerosol samples were collected in the urban atmosphere of Beijing, China, by deploying a tethered balloon. Coarse particles (d > 1 mm) were individually analyzed using electron microscopes, to investigate the extent of dust modification by acidic gases in the atmosphere. Based on the elemental composition, irregularly shaped mineral dust was separated into carbonate and silicate groups. Both sulfate and nitrate were found to accumulate on carbonate more readily than silicate particles. Interestingly, spherical particles resembling Ca-carbonate in composition were spotted frequently in the samples. These Ca-rich spherical particles were more abundant under humid conditions, suggesting that they are deliquesced carbonate particles that formed in the atmosphere following the uptake of acidic gases. Sulfate and nitrate were more frequently detected in the Ca-rich spherical particles than in carbonate in the original solid form, indicating that the gas uptake efficiency of carbonate is further enhanced after the phase transition.

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“…Okada et al (1990) reported that individual Asian dust particles collected over Japanese islands sometimes had an internal mixture of water-soluble and water-insoluble material, and the water-soluble material mainly contained Ca and S. Krueger et al (2004) also found high yields of nitrate formation on calcite and dolomite among individual dust particles from different dust source regions. Traffic and coal burning, accountable for the high levels of NO x and SO 2 , are also the main producers of soil and coal ash mineral particles (Hien et al 2001(Hien et al , 2004Begum et al 2004;Gwilliam et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Characteristics and composition of the falling dust in urban environment

Al‐Harbi

2013

Int. J. Environ. Sci. Technol.

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The monthly total amount of dust fall, as well as its chemical and physical characteristics, was systematically investigated in Shuwaikh city, Kuwait. Dust samples were collected on a monthly basis for the entire year of 2009 and analyzed in the laboratory for water-soluble and water-insoluble matter. Water-insoluble matter represented the major portion of the total annual dust. ANOVAs showed significant temporal variation in the concentration of dust fall over the months (p \ 0.05). Higher dust deposits were encountered between June and August and ranged from 76.4 to 97.6 ± 2.5 (SD) ton km -2 month -1 , where dusty winds and low humidity are a common attribute in such arid areas. The main three soluble matter species measured are nitrate, sulfate, and chloride, and sulfate was found to be the most abundant inorganic species, ranging from 0.72 ± 0.13 to 4.1 ± 0.3 ton km -2 -month -1 . Major insoluble matter species measured are ash, silica, combustible, and tarry. Ash, silica, and combustible account for 63, 19, and 17.8 % of total insoluble dust, and 58.4, 17.7, and 16.6 % of total dust, respectively. Particle size distribution was also investigated, and results showed that dust particles[7 lm were the highest concentration of falling dust. Metrological conditions were found to play a vital role in temporal variations in falling dust.

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Heterogeneous chemistry of individual mineral dust particles from different dust source regions: the importance of particle mineralogy

Cited by 328 publications

References 40 publications

Carbonaceous and Secondary Inorganic Aerosols during Wintertime Fog and Haze over Urban Sites in the Indo-Gangetic Plain

Carbonaceous and Secondary Inorganic Aerosols during Wintertime Fog and Haze over Urban Sites in the Indo-Gangetic Plain

Morphological and chemical modification of mineral dust: Observational insight into the heterogeneous uptake of acidic gases

Characteristics and composition of the falling dust in urban environment

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