Development of laser diagnostics methods for PAH: Phase 1. Development of laser desorption laser photoionization mass spectrometry method for the screening of polycyclic aromatic hydrocarbons in soots and fly ash. Final report. [PAH (polycyclic aromatic hydrocarbon)]

Technical Report · Wed Jul 01 00:00:00 EDT 1992

OSTI ID:6250727

Kelly, P B; Smith, C H; Young, M K; Chang, D P.Y.; Jones, A D

A Laser Desorption Laser Photoionization Mass Spectrometry (LDLPMS) technique has been developed for the direct screening of polycyclic aromatic hydrocarbons (PAHs) in as-received soot and fly-ash samples. The method employs pulsed IR desorption from the surface of particulate matter collected on air-sampling filters, followed by UV laser multiphoton ionization of the desorbed molecules. The ions thus formed are mass-analyzed in a custom-built time-of-flight mass spectrometer. Photoionization of PAH standards at 266 nm produces intense parent molecular ion peaks with little or no fragmentation, allowing identification via molecular weight determination. The application of the method to the detection of PAHs in rice soot samples is demonstrated. The level of detection for PAHs is estimated to be 10-20 ng/sample, which is well within the low resolution target detection limit for ARB Method 429.

• Research Organization: California Univ., Davis, CA (United States)
• OSTI ID: 6250727
• Report Number(s): PB-93-216695/XAB; CNN: ARB-A932-099
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
FLY ASH
QUALITATIVE CHEMICAL ANALYSIS
POLYCYCLIC AROMATIC HYDROCARBONS
LASER SPECTROSCOPY
MASS SPECTROSCOPY
SOOT
AIR POLLUTION MONITORING
DESORPTION
PARTICULATES
PHOTOIONIZATION
TIME-OF-FLIGHT MASS SPECTROMETERS
AEROSOL WASTES
AROMATICS
ASHES
CHEMICAL ANALYSIS
COMBUSTION PRODUCTS
DYNAMIC MASS SPECTROMETERS
HYDROCARBONS
IONIZATION
MASS SPECTROMETERS
MEASURING INSTRUMENTS
MONITORING
ORGANIC COMPOUNDS
PARTICLES
RESIDUES
SORPTION
SPECTROMETERS
SPECTROSCOPY
TIME-OF-FLIGHT SPECTROMETERS
WASTES
400102* - Chemical & Spectral Procedures
400201 - Chemical & Physicochemical Properties
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)