title: Sampling artifacts from the use of denuder tubes with glycerol based coatings in the measurement of atmospheric particulate matter.
abstract: Chemical speciation studies use sampling configurations that often require the deployment of denuder tubes of various types to measure certain species or control particulate sampling artifacts. Concurrent sets of measurements on Teflon membrane and quartz filters in specific sampling configurations were used to evaluate the potential influence of denuder tubes with glycerol-based coatings on particulate mass and carbon measurements on downstream filters. Positive biases were observed in the measurement of gravimetric mass and carbon on Teflon and quartz filters, respectively, downstream of sodium carbonate/ glycerol and citric acid/glycerol coated denuder tubes relative to those without upstream denuder tubes. The magnitude of the bias is dependent on the level of ambient particulate loading.
authors.affiliation: Department of Civil and Environmental Engineering, Washington State University, Pullman 99164-2910, USA.
authors.forename: D
authors.initials: D
authors.lastname: Finn
authors.forename: B
authors.initials: B
authors.lastname: Rumburg
authors.forename: C
authors.initials: C
authors.lastname: Claiborn
authors.forename: L
authors.initials: L
authors.lastname: Bamesberger
authors.forename: W F
authors.initials: WF
authors.lastname: Siems
authors.forename: J
authors.initials: J
authors.lastname: Koenig
authors.forename: T
authors.initials: T
authors.lastname: Larson
authors.forename: G
authors.initials: G
authors.lastname: Norris
mesh_terms: D000336:Aerosols; D000393:Air Pollutants / Q000032:analysis*; D002244:Carbon / Q000032:analysis; D002254:Carbonates; D019343:Citric Acid; D005990:Glycerol; D010316:Particle Size; D011138:Polytetrafluoroethylene; D011791:Quartz
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D002254:Carbonates; D011791:Quartz; D019343:Citric Acid; C005686:sodium carbonate; D002244:Carbon; D011138:Polytetrafluoroethylene; D005990:Glycerol