title: Trimethylamine as precursor to secondary organic aerosol formation via nitrate radical reaction in the atmosphere.
abstract: Amines in fine particulate matter have been detected and quantified during ambient studies of winter inversions in Logan, UT, using aerosol mass spectrometry. Amine-related compounds account for 0.5-6 microg m(-3) of fine particulate mass during some wintertime periods. The amine contributions sometimes show a clear diurnal pattern, reaching peak concentrations during the middle of the nightwhile decreasing during the morning and afternoon. Smog chamber reactions show that the reaction of tertiary amines with nitrate radical can account for this behavior in the atmosphere. The lower bound reaction rate of trimethylamine and nitrate radical is estimated at 4.4 x 10(-16) cm3/molecules/s with a conversion rate to the aerosol phase of approximately 65%. This suggests that amines could be a contributor to secondary organic aerosol formation in areas where nitrate radical is a significant player in oxidation chemistry.
authors.affiliation: Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, Utah 84322-0300, USA. phil.silva@usu.edu
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Silva
authors.forename: Mark E
authors.initials: ME
authors.lastname: Erupe
authors.forename: Derek
authors.initials: D
authors.lastname: Price
authors.forename: John
authors.initials: J
authors.lastname: Elias
authors.forename: Quentin G J
authors.initials: QG
authors.lastname: Malloy
authors.forename: Qi
authors.initials: Q
authors.lastname: Li
authors.forename: Bethany
authors.initials: B
authors.lastname: Warren
authors.forename: David R
authors.initials: DR
authors.lastname: Cocker
mesh_terms: D000336:Aerosols / Q000032:analysis* / Q000737:chemistry; D000588:Amines / Q000032:analysis* / Q000737:chemistry; D001272:Atmosphere / Q000737:chemistry*; D013058:Mass Spectrometry; D008744:Methylamines / Q000032:analysis*; D009566:Nitrates / Q000737:chemistry; D052638:Particulate Matter / Q000032:analysis*; D014589:Utah
chemical_list: D000336:Aerosols; D000588:Amines; D008744:Methylamines; D009566:Nitrates; D052638:Particulate Matter; C023336:trimethylamine