Aerosol Chemical Composition Using Aerosol Mass Spectrometry

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Aerosol Chemical Composition Using Aerosol Mass
Spectrometry
R. Chang, J. Abbatt University of Toronto K.
Hayden, R. Leaitch, S.-M. Li, J. Liggio
Environment Canada
ASCOS Workshop Landskrona April 9, 2008
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Objectives

• characterize composition of surface aerosols
• physical properties, hygroscopic properties
• source of air
• local natural aerosol
• Does it correlate with biological activity?
• Is there an organic component?
• Are the aerosols neutralized? Is there enough
  ammonia present?
• Is there MSA in the aerosol?
• transported anthropogenic aerosol
• Are the aerosols neutralized?
• Is there an organic component?

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Time-of-Flight Aerosol Mass Spectrometer
Mass Spectrum Mode
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SOLAS 2007 in Canadian Arctic
Organic Nitrate Sulphate Ammonium Chloride
Clean 1
Clean 2
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Clean 1
Number
Volume
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Sulphate MS Neutralized
NIST H2SO4
Clean 1
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Time-of-Flight Aerosol Mass Spectrometer
Particle Time of Flight Mode (PToF)
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PToF Distribution in Southern Ontario
Sulphate Organic Ammonium Nitrate Chloride
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Halogen Chemistry withOut On The Ice (OOTI)

• J. Bottenheim, S. Netcheva Environment Canada

ASCOS Workshop Landskrona April 9, 2008
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Introduction

• Spring time chemistry

Br2 h? ? 2Br
2(Br O3 ? BrO O2) (O3 depletion)
BrO DMS ? DMSO Br/BrO Hg0 ? RGM ? mercury
deposition
Question Can this chemistry occur in the summer?
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Instrumentation for Target Species

• BrO Multi-Axis Differential Optical Absorption
  Spectrometer (MaxDOAS, Ocean Optics)
• O3 UV Absorption Based Monitor (2B)
• Hg0 Atomic Absorption Mercury Vapour Analyzer
  (Gardis)