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Gas‐Phase Sorption–Desorption of Propargyl Bromide and 1,3‐Dichloropropene on Plastic Materials
Author(s) -
Allaire S. E.,
Yates S. R.,
Ernst F.,
Papiernik S. K.
Publication year - 2003
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2003.1915
Subject(s) - sorption , desorption , polyvinyl chloride , silicone , vinyl chloride , polyethylene , chemistry , bromide , nuclear chemistry , materials science , polymer chemistry , adsorption , polymer , organic chemistry , copolymer
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 cm 3 g −1 for PVC to 215 cm 3 g −1 for silicone. Freundlich sorption coefficients for 1,3‐D ranged from 11.5 to 371 cm 3 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.