Evaluation of the suitability of selected porous polymers for preconcentrations of volatile organic compounds

Development and validation of a portable gas phase standard generation and calibration system for volatile organic compounds

“…This method is more suitable for polar and reactive species which would otherwise be lost to surfaces at low mixing ratios (Barratt, 1981). The two most commonly used techniques are standard generation through the use of diffusion cells (Thompson and Perry, 2009;Altshuller and Cohen, 1960;Possanzini et al, 2000;Namiesnik et al, 1981;Williams et al, 2000) and permeation sources (Okeeffe and Ortman, 1966). Diffusion sources are often used in place of permeation sources when the latter is unavailable or behavior of a substance in a permeation source is nonideal (i.e.…”

Measurement of breakthrough volumes of volatile chemical warfare agents on a poly(2,6-diphenylphenylene oxide)-based adsorbent and application to thermal desorption–gas chromatography/mass spectrometric analysis

“…where t g(B) (breakthrough time) and t R (retention time) are defined as the time (on the extracted ion chromatogram) at which 5% and 100% of the maximum signal abundance of the CWA peaks are reached under a constant temperature [25,26,31]. Meanwhile, the specific breakthrough volume (V o g(B) , L/g) and specific retention volume (V o R , L/g) are defined as the breakthrough and retention volumes (V g(B) and V R ) divided by the quantity of the adsorbent (g).…”

“…Elution volume is theoretically related to its breakthrough volume. Breakthrough volumes for volatile organic compounds on various adsorbents have been measured previously [26]. However, the breakthrough volumes of CWAs on selected adsorbents are not widely reported, with the exception of GB (600 L/g) and soman (GD) (2100 L/g) on Tenax ® GC [13], and GB (72 L/g) on Tenax ® GR at 20 • C [27].…”

Sample Preparation for Chromatographic Analysis

“…It is more expensive than the macroreticular porous polymer beads based on polystyrene and poly(methacrylate) polymers but is generally preferred over these because of its greater chemical purity and thermal stability [8,9,180,[385][386][387][388][389][390][391]. Porous polymers, various forms of carbon, or inorganic adsorbents, such as silica gel and alumina, are the most frequently used.…”