Determination of aromatic hydrocarbons in air using diffusion denuders

Abstract

The results of a study to evaluate a recently developed denuder sampling system for the determination of aromatic hydrocarbons in air are presented. Denuders of different lengths were tested in laboratory experiments by means of dynamically generated test gases at conditions similar to those at workplaces. Uptake rates, adsorption capacities as well as desorption efficiencies were measured at different sampling parameters. The influence of air humidity on the adsorption behaviour was determined. Finally, the suitability of the system for outdoor air investigations was checked. The denuders were very suitable for the determination of aromatic hydrocarbons in workplace air; the general feasibility to investigate outdoor air samples was demonstrated.

Monitoring of Air-Dispersed Formaldehyde and Carbonyl Compounds as Vapors and Adsorbed on Particulate Matter by Denuder-Filter Sampling and Gas Chromatographic Analysis

“…Each result represents the average value of five replicates collected at a given air-flow rate. To compare the experimental with theoretical data it is important to remember that in the case of perfect sorption the fractional penetration of a gaseous species with diffusivity D passing through an annular denuder is described by the Gormley and Kennedy equation [24,42,43,44,45] m 2 /m 1 ≈ 0.82 exp (−22.53Δ) with Δ is defined as Δ = (πDL/4F) (d 1 + d 2 )/(d 2 − d 1 )…”

Determination of gaseous and particulate carbonyls in air by gradient‐elution micellar electrokinetic capillary chromatography

“…Carbonyls are present in both gases and particles. Particulate carbonyls can penetrate deeper into the human respiratory system than gaseous carbonyls, causing a higher toxicological risk 22. In addition, the photochemical reaction of carbonyls is highly dependent on their physical state, and the removal of gases and particles follows different paths and deposition velocity.…”