Evidence for the existence of organosulfates from beta-pinene ozonolysis in ambient secondary organic aerosol.
The formation of organosulfates from the gas-phase ozonolysis of beta-pinene in the presence of neutral or acidic sulfate particles was investigated in a series of indoor aerosol chamber experiments. The organosulfates were analyzed using high-performance liquid chromatography (LC) coupled to electrospray ionization-time-of-flight mass spectrometry (MS) in parallel to ion trap MS. Organosulfates were only found in secondary organic aerosol from beta-pinene ozonolysis in the presence of acidic sulfate seed particles. One of the detected organosulfates also occurred in ambient aerosol samples that were collected at a forest site in northeastern Bavaria, Germany. beta-Pinene oxide, an oxidation product in beta-pinene/O3 and beta-pinene/NO3 reactions, is identified as a possible precursor for the beta-pinene-derived organosulfate. Furthermore, several nitroxy-organosulfates originating from monoterpenes were found in the ambient samples. These nitroxy-organosulfates were only detected in the nighttime samples, suggesting a role for nighttime chemistry in their formation. Their LC/MS chromatographic peak intensities suggest that they represent an important fraction of the organic mass in ambient aerosols, especially at night.
Iinuma
Yoshiteru
Y
Leibniz-Institut für Troposphärenforschung, Permoserstrasse 15, D-04318 Leipzig, Germany.
Müller
Conny
C
Berndt
Torsten
T
Böge
Olaf
O
Claeys
Magda
M
Herrmann
Hartmut
H
D000336:Aerosols; D000393:Air Pollutants / Q000737:chemistry*; D000081008:Bicyclic Monoterpenes; D001643:Bridged Bicyclo Compounds / Q000737:chemistry*; D039821:Monoterpenes / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry
D000336:Aerosols; D000393:Air Pollutants; D000081008:Bicyclic Monoterpenes; D001643:Bridged Bicyclo Compounds; D039821:Monoterpenes; D016877:Oxidants; D013431:Sulfates; D013464:Sulfuric Acids; C010789:beta-pinene; D010126:Ozone; C033158:sulfuric acid