Evaluation of a particle trap laser desorption mass spectrometer (PT-LDMS) for the quantification of sulfate aerosols
書誌事項
- 公開日
- 2016-01-13
- 資源種別
- journal article
- DOI
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- 10.1080/02786826.2016.1139685
- 10.6084/m9.figshare.1632852.v1
- 公開者
- Informa UK Limited
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説明
A particle trap laser desorption mass spectrometer (PT-LDMS) has been developed for online measurements of the chemical composition of submicron aerosol particles. The PT-LDMS was evaluated by both laboratory and ambient measurements, with the main focus being the quantification of sulfate aerosols. Ammonium sulfate ((NH4)2SO4) is generally the predominant form of sulfate aerosols in urban air; hence, it is used as a material for laboratory experiments and calibration. Major fragments of (NH4)2SO4 were observed at mass-to-charge ratios (m/z) of 48 (SO+) and 64 (SO2+). The dependence of the sensitivity (expressed as the ratio of the m/z 48 signal to sulfate mass) on the laser power and cell temperature was investigated. An intercomparison of the PT-LDMS with a commercial sulfate particle analyzer (SPA) and filter sampling was performed in Tokyo. Good agreement was observed between the SPA and filter analysis (slope = 0.98, r2 = 0.99). Although the mass concentration of sulfate measured by the PT-LDMS exhibited a tight correlation with that measured by the SPA, the mass concentration measured by the PT-LDMS tended to underestimate that measured by the SPA (slope = 0.70, r2 = 0.96). While the discrepancy can be attributed mainly to the difference in size cut between the PT-LDMS (approximately PM1) and SPA (PM2.5), differences in the vaporization efficiency were also found to be important.
収録刊行物
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- Aerosol Science and Technology
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Aerosol Science and Technology 50 (2), 173-186, 2016-01-13
Informa UK Limited
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詳細情報 詳細情報について
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- CRID
- 1360004234124875776
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- ISSN
- 15217388
- 02786826
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
