Chemistry and Physics Faculty Articles

Title

Online Single Particle Analysis of Chemical Composition and Mixing State of Crop Straw Burning Particles: From Laboratory Study to Field Measurement

Document Type

Article

Publication Date

4-2016

Keywords

Crop straw burning particles, Mixing state, Aging process, ATOFMS, Ion markers

Publication Title

Frontiers of Environmental Science & Engineering

ISSN

2095-221X

Volume

10

Issue/No.

2

First Page

244

Last Page

252

Peer Reviewed

1

Abstract

Fresh straw burning (SB) particles were generated in the laboratory by the combustion of rice straw and corn straw. The chemical composition and mixing state of the fresh SB particles were investigated by an Aerosol Time-of-Flight Mass Spectrometer (ATOFMS). Based on the mass spectral patterns, the SB particles were clustered into four major types: Salt, Organic Carbon (OC), Elemental Carbon (EC), and internally mixed particles of EC and OC (EC-OC). In addition, particles containing ash, polycyclic aromatic hydrocarbons, heavy metals or nicotine were also observed. Physical and chemical changes of the SB particles immediately after the emission were analyzed with highly time-resolved data. During the aging processes, the average particle size increased steadily. Freshly emitted organic compounds were gradually oxidized to more oxygenated compounds in the OC-containing particles. Meanwhile, an important displacement reaction (2KCl + SO42− → K2SO4 + 2Cl) was observed. The marker ions for SB particles were optimized and applied to identify the SB particles in the ambient atmosphere. The fluctuation of the number fraction of ambient SB particles sorted by ATOFMS agrees well with that of water soluble K+ measured by an online ion chromatography, demonstrating that the optimized marker ions could be good tracers for SB particles in field measurements.

Comments

Supplementary material is available for this article at 10.1007/s11783-015-0768-z and is accessible for authorized users.

Additional Comments

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2015

DOI

10.1007/s11783-015-0768-z

This document is currently not available here.

Find in your library

Share

COinS