Linked Life Data

18571186

Source:http://linkedlifedata.com/resource/pubmed/id/18571186

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2008-7-8
pubmed:abstractText
A thermal extraction-two-dimensional gas chromatography-mass spectrometry (TE-GC-GC-MS) method with heart-cutting is developed for quantitatively assessing nitrogen (N)-bearing organic species (e.g., pyrrole, pyridine, nitriles, and amines) in aerosols emitted from agricultural fires. Pyrolysis of the constituents in the crop residue is a likely formation pathway for these compounds. An evaluation of the TE-GC-GC-MS method proficiency for them confirms low carryover (<1%), adequate recovery (84-100%), high reproducibility (<9% RSD), picogram method detection limits, and a linear dynamic range spanning four orders of magnitude. The 14 substances for which quantitative results are available are primarily heterocyclic aromatic N compounds that comprise 0.7% (w/w) of the total fine aerosol mass. The benefits of TE-GC-GC-MS versus conventional GC-MS methods for organic N species in aerosols may depend on the matrix and the target N analyte concentration in that matrix; for the biomass burning aerosol examined in this study, the former approach reduces the unresolved complex mixture and detects organic N species not seen with GC-MS. We show another advantage of TE-GC-GC-MS is that it adequately resolves the anhydro-sugar (e.g., levoglucosan), alkanoic acid, and substituted phenol molecules in the biomass burning aerosol without the use of methylation or trimethyl-silyl derivatizing agents.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0021-9673
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
1200
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
228-34
pubmed:dateRevised
2009-1-15
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Thermal extraction-two-dimensional gas chromatography-mass spectrometry with heart-cutting for nitrogen heterocyclics in biomass burning aerosols.
pubmed:affiliation
U.S. Environmental Protection Agency, National Risk Management Research Laboratory, Research Triangle Park, NC 27711, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.