Using environmental scanning electron microscopy to determine the hygroscopic properties of agricultural aerosols

被引：31

作者：

Hiranuma, Naruki ^{[1
]}

Brooks, Sarah D. ^{[1
]}

Auvermann, Brent W. ^{[2
]}

Littleton, Rick ^{[3
]}

机构：

[1] Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA

[2] Texas A&M Univ Res & Extens Ctr, Amarillo, TX 79106 USA

[3] Texas A&M Univ, Microscopy & Imaging Ctr, College Stn, TX 77843 USA

来源：

ATMOSPHERIC ENVIRONMENT | 2008年 / 42卷 / 09期

关键词：

agricultural aerosol; visibility; hygroscopicity; environmental scanning electron microscope (ESEM); energy dispersive x-ray spectroscope (EDS);

D O I：

10.1016/j.atmosenv.2007.12.003

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A field study at a cattle feedlot in the Texas Panhandle was conducted to characterize the hygroscopic, morphological, and chemical properties of agricultural aerosols and to identify possible correlations between these properties. To explore the hygroscopic nature of the agricultural particles, we have collected size-resolved aerosol samples using a cascade impactor system and have used an environmental scanning electron microscope (ESEM) to determine the water uptake by individual particles in those samples as a function of relative humidity (RH). in addition, complementary determination of the elemental composition of single particles was performed using energy dispersive X-ray spectroscopy (EDS). Our results indicate that most of the agricultural particles do not take up significant amounts of water when exposed to up to 96% RH. However, a small fraction of particles in the coarse mode deliquesced at approximately 75% RH and reached twice their original sizes by 96% RH. The observed changes in particle size with increased RH may significantly impact total aerosol extinction, visibility, and human health. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1983 / 1994

页数：12

共 35 条

[1]

AUVERMANN BW, 2004, ASAE C P

[2] Phase transitions and hygroscopic growth of aerosol particles containing humic acid and mixtures of humic acid and ammonium sulphate [J].

Badger, CL ;

George, I ;

Griffiths, PT ;

Braban, CF ;

Cox, RA ;

Abbatt, JPD .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2006, 6 :755-768

[3] Water uptake by particles containing humic materials and mixtures of humic materials with ammonium sulfate [J].

Brooks, SD ;

DeMott, PJ ;

Kreidenweis, SM .

ATMOSPHERIC ENVIRONMENT, 2004, 38 (13) :1859-1868

[4] Deliquescence behavior of organic/ammonium sulfate aerosol [J].

Brooks, SD ;

Wise, ME ;

Cushing, M ;

Tolbert, MA .

GEOPHYSICAL RESEARCH LETTERS, 2002, 29 (19) :23-1

[5]

BROOKS SD, 2003, J GEOPHYS RES, V108, P21

[6]

BUCHANAN JS, 1996, NUTR REQUIREMENTS BE

[7] Hygroscopic properties of two model humic-like substances and their mixtures with inorganics of atmospheric importance [J].

Chan, MN ;

Chan, CK .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2003, 37 (22) :5109-5115

[8] The effects of organic species on the hygroscopic behaviors of inorganic aerosols [J].

Choi, MY ;

Chan, CK .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2002, 36 (11) :2422-2428

[9] Continuous measurements of the water activities of aqueous droplets of water-soluble organic compounds [J].

Choi, MY ;

Chan, CK .

JOURNAL OF PHYSICAL CHEMISTRY A, 2002, 106 (18) :4566-4572

[10] Deliquescence and hygroscopic growth of mixed inorganic-organic atmospheric aerosol [J].

Cruz, CN ;

Pandis, SN .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2000, 34 (20) :4313-4319

← 1 2 3 4 →