Individual particle morphology and acidity

被引：16

作者：

Coz, Esther ^{[1
]}

Artinano, Begona ^{[1
]}

Robinson, Allen L. ^{[2
]}

Casuccio, Gary S. ^{[3
]}

Lersch, Traci L. ^{[3
]}

Pandis, Spyros N. ^{[4
,5
]}

机构：

[1] CIEMAT, Dept Medio Ambiente, E-28040 Madrid, Spain

[2] Carnegie Mellon Univ, Dept Mech Engn, Pittsburgh, PA 15213 USA

[3] RJ Lee Grp Inc, Monroeville, PA USA

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

[5] FORTH, Inst Chem Engn & High Temp Chem Proc, Patras, Greece

来源：

AEROSOL SCIENCE AND TECHNOLOGY | 2008年 / 42卷 / 03期

基金：

美国国家科学基金会; 美国安德鲁·梅隆基金会;

关键词：

D O I：

10.1080/02786820801958759

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The morphological characterization of particles during the Pittsburgh Air Quality Study (PAQS) suggests that particle shape and physical state depends on their acidity. The aerosol shape parameters measured by Computer-Controlled Scanning Electron Microscopy (CCSEM) are statistically different in periods when atmospheric particles are neutral and when they are acidic. High concentrations of particles smaller than 500 nm with high sulfur content and liquid appearance or signs of a previous liquid state before partial or total recrystallization are present on filters collected in days with high aerosol acidity. By contrast, in winter and summer periods in which the aerosol was neutral, the shape parameter values are similar and suggest that the particles have been dried out. These direct observations support the hypothesis that during summer acidic periods in the Eastern United States the particles may contain some water even at low relative humidity both in the atmosphere and on filters.

引用

页码：224 / 232

页数：9

共 41 条

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