Design and performance of a high-volume compound annular denuder

Particle Transmission Characteristics of an Annular Denuder Ambient Sampling System

“…Possanzini et al (1983) and Rosenberg et al (1988) used polydisperse aerosols, with optical particle counters for particle size discrimination, to measure losses in their particular annular denuder systems for particles as small as 0.1 pm in diameter. Similar measurements were reported by Coutant et al (1989) for a high-volume compound annular denuder. Koutrakis et al (1990) reported annular denuder loss measurements made with monodisperse particles, but only for particle diameters larger than 1 pm.…”

Direct determination of the phase distributions of semi-volatile polycyclic aromatic hydrocarbons using annular denuders

“…The performance of the IOVPS can also be assessed by using the models for annular denuder efficiency developed by Possanzini et al Coutant et al (1989). Both models predict that, for sufficient denuder length, the ratio of outlet to inlet concentration for a trapped component of the airstream follows an exponential dependence on the ratio of denuder length to the total air flow.…”

Gas Collection Efficiency and Entrance Flow Effect of an Annular Diffusion Denuder

“…It is reasonable for some fast gas-coating reaction kinetics, for example, the reaction of SO, and tetrachloromercurate coating, the reaction of HNO, (or HNO,) and (Na,CO, + lycerol + methanol) coating, and the reaction of NH, and (citric acid + glycerol + methanol) coating (Possanzini et al, 1983 andBrauer et al, 1989). It does not apply to the slow gas-coating reaction kinetics (Coutant et al, 1989). In practice, a fast gas-coating reaction kinetics is always preferred and used in gas collection; the slow gas-coating reaction is not effective and practical.…”