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Gas-Phase Sorption–Desorption of Propargyl Bromide and 1,3-Dichloropropene on Plastic Materials

^a Pavillon de l'Envirotron, FSAA, Université Laval, Québec, Canada G1K 7P4
^b George E. Brown, Jr. Salinity Laboratory, USDA-ARS, 450 West Big Springs Road, Riverside, CA 92507

^* Corresponding author (suzanne.allaire{at}sga.ulaval.ca).

Received for publication August 15, 2002. The goal of this research was to provide information for choosing appropriate materials for studying gas-phase concentrations of propargyl bromide (3BP) and 1,3-dichloropropene (1,3-D) in laboratory experiments. Several materials were tested and found to sorb both gas-phase chemicals in the following order: stainless steel (SS) < Teflon polytetrafluoroethylene (PTFE-FEP) flexible polyvinyl chloride (PVC) acrylic < low-density polyethylene (PE) < vinyl silicone < polyurethane foam (PUF). Sorption of SS was insignificant and PUF sorbed all the fumigant that was applied. For the other materials, linear sorption coefficients (K_d) for 3BP ranged from 3.0 cm³ g^-1 for PVC to 215 cm³ g^-1 for silicone. Freundlich sorption coefficients for 1,3-D ranged from 11.5 to 371 cm³ g^-1. First-order desorption rate constants in an open system ranged from 0.05 to 1.38 h^-1 for 3BP and from 0.07 to 1.73 h^-1 for 1,3-D. In a closed system, less than 2% of sorbed fumigant desorbed from vinyl while up to 99% desorbed from PVC within 24 h when equilibrated at the highest headspace concentration. Sorption of both fumigants was linearly related to the square root of time except for vinyl and silicone. This may indicate non-fickian diffusion of fumigant into the polymer matrix. Vinyl, silicone, PE, and PUF should be avoided for quantitative study of organic gases, except possibly as a trapping medium. Use of PTFE, PVC, and acrylic may require correction for sorption–desorption and diffusion.

Abbreviations: 3BP, propargyl bromide • 1,3-D, 1,3-dichloropropene • GC, gas chromatography • K_d, linear sorption coefficient • K_f, Freundlich sorption coefficient • PE, polyethylene • PTFE, polytetrafluoroethylene • PUF, polyurethane foam • PVC, polyvinyl chloride • SS, stainless steel

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