American Association for Aerosol Research - Abstract Submission

AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA

Abstract View


Development and Evaluation of a Laser Induced Incandescence - Mass Spectrometric Analyzer (LII-MS) for Online Measurements of Aerosol Chemical Composition

MIYAKAWA TAKUMA, Takeda Naoki, Koizumi Kazuhiro, Tabaru Masaya, Ozawa Yuya, Hirayama Noritomo, Takegawa Nobuyuki, The University of Tokyo

     Abstract Number: 299
     Working Group: Instrumentation and Methods

Abstract
We have developed a new method to quantify chemical composition of aerosol particles depending on their mixing state with black carbon (BC): a laser induced incandescence – particle mass spectrometric analyzer (LII-MS). The LII-MS is a series of a LII chamber and a particle trap-laser desorption mass spectrometer (PT-LDMS) as reported by Takegawa et al. (2012). The LII chamber, which was designed and assembled by Fuji Electric Co. Ltd., is conceptually the same as a single particle soot photometer (SP2, Droplet Measurement Technologies Inc.) . The LII chamber does not only detect but also vaporize and/or decompose BC-containing particles and then the PT-LDMS measures the mass concentrations of sulfate, nitrate, and organic carbon in the sample air efficiently transferred from the LII chamber. The LII laser is turned on and off periodically, which enables the quantification of aerosol chemical composition with respect to their mixing state with BC. Performance of the LII-MS was tested in the laboratory by generating aerosol particles with various chemical compositions and mixing states, and the results have demonstrated the proof of concept. Preliminary data from ambient measurements in Tokyo are also presented and discussed.