Characterization of size-differentiated inorganic composition of aerosols in Mexico City
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| Title: | Characterization of size-differentiated inorganic composition of aerosols in Mexico City |
|---|---|
| Authors: | Moya, Mireya1 mmoya@servidor.unam.mx, Castro, Telma1, Zepeda, Monica2, Baez, Armando1 |
| Source: | Atmospheric Environment. 2003, Vol. 37 Issue 25, p3581. 11p. |
| Subjects: | Aerosols, Ammonium, Sulfates |
| Geographic Terms: | Mexico City (Mexico), Mexico |
| Abstract: | Size-differentiated atmospheric aerosol particles were collected during December 2000–October 2001 in Mexico City (19°N, 99°W) using a micro-orifice uniform deposit impactor. Sulfate and ammonium, which were correlated, were major features of the size distributions. The more predominant mode was at 0.32±0.1 μm, aerodynamic diameter. This peak of concentration is likely the result of condensation of secondary aerosol components from the gas phase. During part of the rainy season (April and June), a larger mode was found at 0.56±0.2 μm, aerodynamic diameter. This peak of concentration, identified as a droplet mode, is probably the result of aqueous-phase reactions (i.e., oxidation of sulfur dioxide in liquid droplets). During August, the peak of concentration was observed at both size ranges of the accumulation mode. Overall, ion balances were achieved with a small deficit of cations, except for the April and June samples, where a significant amount of excess sulfate was present as a result of moderate–high activity of the neighboring volcano Popocatepetl, as well as ambient conditions that favored production of sulfate (moderate–high relative humidity values). Based on the analysis of the ammonia/sulfate molar ratios, the ammonia concentrations were sufficient to fully neutralize sulfate concentrations, except for the April and June samples. During these months, ammonium bisulfate, letovicite and H2SO4(aq) (or a solution of the corresponding ions) were the dominant form of sulfate present in both fine and coarse modes. The acidic nature of these particles (with NH3/H2SO4 molar ratio less than 2) is potentially important in assessing health effects of inhaled particles. [Copyright &y& Elsevier] |
| Copyright of Atmospheric Environment is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 10276621 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Characterization of size-differentiated inorganic composition of aerosols in Mexico City – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Moya%2C+Mireya%22">Moya, Mireya</searchLink><relatesTo>1</relatesTo><i> mmoya@servidor.unam.mx</i><br /><searchLink fieldCode="AR" term="%22Castro%2C+Telma%22">Castro, Telma</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zepeda%2C+Monica%22">Zepeda, Monica</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Baez%2C+Armando%22">Baez, Armando</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Atmospheric+Environment%22">Atmospheric Environment</searchLink>. 2003, Vol. 37 Issue 25, p3581. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Ammonium%22">Ammonium</searchLink><br /><searchLink fieldCode="DE" term="%22Sulfates%22">Sulfates</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Mexico+City+%28Mexico%29%22">Mexico City (Mexico)</searchLink><br /><searchLink fieldCode="DE" term="%22Mexico%22">Mexico</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Size-differentiated atmospheric aerosol particles were collected during December 2000–October 2001 in Mexico City (19°N, 99°W) using a micro-orifice uniform deposit impactor. Sulfate and ammonium, which were correlated, were major features of the size distributions. The more predominant mode was at 0.32±0.1 μm, aerodynamic diameter. This peak of concentration is likely the result of condensation of secondary aerosol components from the gas phase. During part of the rainy season (April and June), a larger mode was found at 0.56±0.2 μm, aerodynamic diameter. This peak of concentration, identified as a droplet mode, is probably the result of aqueous-phase reactions (i.e., oxidation of sulfur dioxide in liquid droplets). During August, the peak of concentration was observed at both size ranges of the accumulation mode. Overall, ion balances were achieved with a small deficit of cations, except for the April and June samples, where a significant amount of excess sulfate was present as a result of moderate–high activity of the neighboring volcano Popocatepetl, as well as ambient conditions that favored production of sulfate (moderate–high relative humidity values). Based on the analysis of the ammonia/sulfate molar ratios, the ammonia concentrations were sufficient to fully neutralize sulfate concentrations, except for the April and June samples. During these months, ammonium bisulfate, letovicite and H2SO4(aq) (or a solution of the corresponding ions) were the dominant form of sulfate present in both fine and coarse modes. The acidic nature of these particles (with NH3/H2SO4 molar ratio less than 2) is potentially important in assessing health effects of inhaled particles. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Atmospheric Environment is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/S1352-2310(03)00345-5 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 3581 Subjects: – SubjectFull: Aerosols Type: general – SubjectFull: Ammonium Type: general – SubjectFull: Sulfates Type: general – SubjectFull: Mexico City (Mexico) Type: general – SubjectFull: Mexico Type: general Titles: – TitleFull: Characterization of size-differentiated inorganic composition of aerosols in Mexico City Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Moya, Mireya – PersonEntity: Name: NameFull: Castro, Telma – PersonEntity: Name: NameFull: Zepeda, Monica – PersonEntity: Name: NameFull: Baez, Armando IsPartOfRelationships: – BibEntity: Dates: – D: 11 M: 08 Text: 2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 13522310 Numbering: – Type: volume Value: 37 – Type: issue Value: 25 Titles: – TitleFull: Atmospheric Environment Type: main |
| ResultId | 1 |
