Linked Life Data

18710205

Source:http://linkedlifedata.com/resource/pubmed/id/18710205

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
36
pubmed:dateCreated
2008-9-5
pubmed:abstractText
Organosulfates of isoprene, alpha-pinene, and beta-pinene have recently been identified in both laboratory-generated and ambient secondary organic aerosol (SOA). In this study, the mechanism and ubiquity of organosulfate formation in biogenic SOA is investigated by a comprehensive series of laboratory photooxidation (i.e., OH-initiated oxidation) and nighttime oxidation (i.e., NO3-initiated oxidation under dark conditions) experiments using nine monoterpenes (alpha-pinene, beta-pinene, d-limonene, l-limonene, alpha-terpinene, gamma-terpinene, terpinolene, Delta(3)-carene, and beta-phellandrene) and three monoterpenes (alpha-pinene, d-limonene, and l-limonene), respectively. Organosulfates were characterized using liquid chromatographic techniques coupled to electrospray ionization combined with both linear ion trap and high-resolution time-of-flight mass spectrometry. Organosulfates are formed only when monoterpenes are oxidized in the presence of acidified sulfate seed aerosol, a result consistent with prior work. Archived laboratory-generated isoprene SOA and ambient filter samples collected from the southeastern U.S. were reexamined for organosulfates. By comparing the tandem mass spectrometric and accurate mass measurements collected for both the laboratory-generated and ambient aerosol, previously uncharacterized ambient organic aerosol components are found to be organosulfates of isoprene, alpha-pinene, beta-pinene, and limonene-like monoterpenes (e.g., myrcene), demonstrating the ubiquity of organosulfate formation in ambient SOA. Several of the organosulfates of isoprene and of the monoterpenes characterized in this study are ambient tracer compounds for the occurrence of biogenic SOA formation under acidic conditions. Furthermore, the nighttime oxidation experiments conducted under highly acidic conditions reveal a viable mechanism for the formation of previously identified nitrooxy organosulfates found in ambient nighttime aerosol samples. We estimate that the organosulfate contribution to the total organic mass fraction of ambient aerosol collected from K-puszta, Hungary, a field site with a similar organosulfate composition as that found in the present study for the southeastern U.S., can be as high as 30%.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Aerosols, http://linkedlifedata.com/resource/pubmed/chemical/Air Pollutants, http://linkedlifedata.com/resource/pubmed/chemical/Alkenes, http://linkedlifedata.com/resource/pubmed/chemical/Bicyclo Compounds, http://linkedlifedata.com/resource/pubmed/chemical/Butadienes, http://linkedlifedata.com/resource/pubmed/chemical/Cyclohexenes, http://linkedlifedata.com/resource/pubmed/chemical/Hemiterpenes, http://linkedlifedata.com/resource/pubmed/chemical/Monoterpenes, http://linkedlifedata.com/resource/pubmed/chemical/Pentanes, http://linkedlifedata.com/resource/pubmed/chemical/Sulfuric Acid Esters, http://linkedlifedata.com/resource/pubmed/chemical/Terpenes, http://linkedlifedata.com/resource/pubmed/chemical/alpha-pinene, http://linkedlifedata.com/resource/pubmed/chemical/beta-pinene, http://linkedlifedata.com/resource/pubmed/chemical/isoprene, http://linkedlifedata.com/resource/pubmed/chemical/limonene, http://linkedlifedata.com/resource/pubmed/chemical/myrcene
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1520-5215
pubmed:author
pubmed:issnType
Electronic
pubmed:day
11
pubmed:volume
112
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
8345-78
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Organosulfate formation in biogenic secondary organic aerosol.
pubmed:affiliation
Department of Chemistry, California Institute of Technology, Pasadena, California 91125, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't