Atmospheric measurements of sub-20 nm diameter particle chemical composition by thermal desorption chemical ionization mass spectrometry

被引：150

作者：

Smith, JN

Moore, KF

McMurry, PH

Eisele, FL

机构：

[1] Natl Ctr Atmospher Res, Div Atmospher Chem, Boulder, CO 80307 USA

[2] Natl Ctr Atmospher Res, Adv Study Program, Boulder, CO 80307 USA

[3] Univ Minnesota, Dept Mech Engn, Minneapolis, MN 55455 USA

[4] Georgia Inst Technol, Atlanta, GA 30332 USA

来源：

AEROSOL SCIENCE AND TECHNOLOGY | 2004年 / 38卷 / 02期

关键词：

D O I：

10.1080/02786820490249036

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

We report the first online measurements of the chemical composition of atmospheric aerosol in the 6-20 nm diameter range. These measurements were performed using the recently developed Thermal Desorption Chemical Ionization Mass Spectrometer (TDCIMS), and were made possible by recent sensitivity enhancements resulting from (a) the development of a unipolar charger optimized for high aerosol flow rates, and (b) an improved flow system in the TDCIMS sample inlet. Measurements of atmospheric aerosol in Boulder, CO revealed large concentration variations in most detected compounds. The most dominant observed compounds in the negative ion TDCIMS spectra were nitrate and sulfate, while in the positive ion spectra ammonium dominated all other observed compounds. Comparison with laboratory data suggests that particles are composed primarily of ammonium sulfate during times of relatively low ambient aerosol concentration.

引用

页码：100 / 110

页数：11

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