Semi-continuous PM2.5 inorganic composition measurements during the Pittsburgh air quality study

被引：58

作者：

Wittig, AE ^{[1
]}

Takahama, S

Khlystov, AY

Pandis, SN

Hering, S

Kirby, B

Davidson, C

机构：

[1] CUNY City Coll, Dept Civil Engn, New York, NY 10031 USA

[2] Carnegie Mellon Univ, Dept Civil & Environm Engn, Pittsburgh, PA 15213 USA

[3] Aerosol Dynam Inc, Albany, CA 94710 USA

[4] Carnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA 15213 USA

[5] Duke Univ, Dept Civil & Environm Engn, Durham, NC 27708 USA

[6] Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA

来源：

ATMOSPHERIC ENVIRONMENT | 2004年 / 38卷 / 20期

关键词：

atmospheric aerosols; PM2.5; nitrate; sulfate; continuous monitors;

D O I：

10.1016/j.atmosenv.2004.03.002

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A method for semi-continuous (10 min time resolution) PM2.5 nitrate and sulfate measurements, based on the humidified impaction with flash volatilization design of Stolzenburg and Hering (Environ. Sci. Technol. 34 (2000) 907), was evaluated during the Pittsburgh Air Quality Study (PAQS) from July 2001 to August 2002. The semi-continuous measurements were corrected for several operating parameters. The overall corrections were less than 10% on average, but could be quite large for individual 10 min measurements. These corrections resulted in an improvement in the agreement of the measurements with the filter-based measurements, with a major axis regression relationship of y = 0.83x + 0.20 mug m(-3) and R-2 of 0.84 for nitrate and y = 0.71x + 0.42 mug m(-3) and R-2 of 0.83 for sulfate. The corrected semi-continuous measurements were calibrated over the entire year using collocated denuder/filter-pack-based measurements. These calibrated semi-continuous measurements are used in conjunction with temporally resolved gas-phase measurements of total (gas- and aerosol-phase) nitrate and meteorological measurements to investigate short-term phenomena at the Pittsburgh Supersite. The gas-to-particle partitioning of nitrate varied daily and seasonally, with a majority of the nitrate in the particle phase at night and during the winter months. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：3201 / 3213

页数：13

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