Sampling at controlled relative humidity with a cascade impactor

被引：29

作者：

Vasiliou, JG ^{[1
]}

Sorensen, D ^{[1
]}

McMurry, PH ^{[1
]}

机构：

[1] Univ Minnesota, Dept Mech Engn, Particle Technol Lab, Minneapolis, MN 55455 USA

来源：

ATMOSPHERIC ENVIRONMENT | 1999年 / 33卷 / 07期

关键词：

cascade impactor; atmospheric aerosol; size distribution; particle bounce; water uptake; hygroscopicity; sulfate;

D O I：

10.1016/S1352-2310(98)00323-9

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The design and function of a device that regulates the relative humidity of an ambient aerosol sample is described. We use this RH controller upstream of MOUDI impactors to permit sampling at relative humidities in the 70-80% range. Humidity control is achieved by allowing the aerosol to approach equilibrium with a saturated salt solution. Benefits to sampling with impactors in this relative humidity range include greatly reduced bounce of fine, hygroscopic particles, minimal flow-induced sizing errors, and minimization of uncertainties in measured size distributions due to diurnal variations in relative humidity during sampling. Data from field measurements in a humid environment (Look Rock, TN) and arid environments (Las Vegas, NV and Meadview, AZ) are discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1049 / 1056

页数：8

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