Simultaneous Measurements of Individual Ambient Particle Size, Composition, Effective Density, and Hygroscopicity

Autor:	Susan Oatis, Dan G. Imre, Alla Zelenyuk, Jeong-Ho Han
Rok vydání:	2008
Předmět:	Atmosphere chemistry.chemical_compound chemistry Differential mobility analyzer Analytical chemistry Particle Relative humidity Particle size Sulfate Mass spectrometry Physics::Atmospheric and Oceanic Physics Water vapor Analytical Chemistry
Zdroj:	Analytical Chemistry. 80:1401-1407
ISSN:	1520-6882 0003-2700
Popis:	The interaction between atmospheric particles and water vapor impacts directly and significantly the effect that these particles exert on the atmosphere. The hygroscopicity of individual particles, which is a quantitative measure of their response to changes in relative humidity, is related to their internal compositions. To properly include atmospheric aerosols in any model requires knowledge of the relationship between particle size, composition, and hygroscopicity. Here we demonstrate the capability to conduct in real time the simultaneous measurements of individual ambient particle hygroscopic growth factors, densities, and compositions using a humidified tandem differential mobility analyzer that is coupled to an ultrasensitive single-particle mass spectrometer. We use as an example the class of particles that are composed of sulfate mixed with oxygenated organics to illustrate how multidimensional single-particle characterization can be extended to yield in addition quantitative information about the composition of individual particles. We show that the data provide the relative concentrations of organics and sulfates, the density of the two fractions, and particle hygroscopicity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c88fad2ed5bbe11d31086fc36d773ac4 https://doi.org/10.1021/ac701723v Zobrazit plný text záznamu