title: A high efficiency all glass sampling and concentration device for adsorptive semivolatile organics.
abstract: A low-volume, inert sampling and enrichment device for semivolatile organic vapors is described. The device consists of two concentric fused silica capillaries. A small portion of the inter-capillary volume, cooled with a burst of compressed carbon dioxide, serves as a trap for the semivolatile organics. The low mass of the trap permits rapid sampling and desorption cycles suitable for applications requiring fast monitoring of semivolatile chemicals. The device is devoid of switching valves in the sampling train and consequently does not suffer from analyte loss due to irreversible adsorption or interference resulting from cross contamination. The device was successfully used for sampling low concentrations of highly adsorptive nitroaromatic compounds and is applicable for polychlorinated dibenzo-p-dioxins (PCDDs) and polyaromatic hydrocarbons (PAHs).
authors.affiliation: Department of Chemistry, University of Missouri-Rolla, 65409-0530, USA.
authors.forename: M
authors.initials: M
authors.lastname: Gehrke
authors.forename: C S
authors.initials: CS
authors.lastname: Kapila
authors.forename: P
authors.initials: P
authors.lastname: Nam
authors.forename: V
authors.initials: V
authors.lastname: Flanigan
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D009930:Organic Chemicals / Q000032:analysis*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D012822:Silicon Dioxide; D012989:Soil Pollutants / Q000032:analysis; D013048:Specimen Handling; D014835:Volatilization
chemical_list: D009930:Organic Chemicals; D000072317:Polychlorinated Dibenzodioxins; D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; D002245:Carbon Dioxide; D012822:Silicon Dioxide