Wet effluent parallel plate diffusion denuder coupled capillary ion chromatograph for the determination of atmospheric trace gases

A parallel plate wet denuder for acidic gas measurement

“…They found that the simpler construction of PPWD offered better absorption efficiency than the annular denuder. The silicacoated PPWD was also used to measure gaseous nitrous, nitric acids, 8 and atmospheric trace gases 9 and showed good gas absorption efficiency. The operation parameter and gas absorption efficiency of previous studies on silica-coated PPWD is shown in Table 1.…”

“…The operation parameter and gas absorption efficiency of previous studies on silica-coated PPWD is shown in Table 1. [7][8][9] Rosman et al 5 used silica-coated denuder described in Simon and Dasgupta [7][8][9] to conduct field measurements. They found that the active surfaces would become unwettable and could not be recovered by washing with solvent when some oily gases were adsorbed on the surface.…”

Capillary ion chromatography

“…Boring et al [79] then coupled a preconcentration column equipped capillary IC system described above to a miniature parallel plate denuder used for collecting soluble gases. They showed that low parts per trillion level detectability of trace ionogenic gases is readily attainable ( Figure 6).…”

An Online Parallel-Plate Wet Denuder System for Monitoring Acetic Acid Gas

“…However, they noted that collection efficiency for acetic acid gas fell to 85%, which might reflect sampling loss in the sampling line and uncertainties due to aging of the acetic acid gas permeation source. Boring et al (1999Boring et al ( , 2002 applied larger silica particles (74-127 μm) and larger denuder plates (273 cm 2 per plate) on the WEPPD to detect gaseous acid concentrations (including acetic acid gas) in field environments. Rather than being bonded chemically with the NaOH/Na 2 SiO 3 solution, silica particles were coated onto plates by thermal bonding.…”