The permeation of organophosphorus compounds in silicone rubber membranes |
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| Affiliation: | 1. Battelle Memorial Institute, 505 King AvenueColumbus, OH 43201USA;2. Department of Chemical Engineering, The University of Cincinnati, University AvenueCincinnati, OH 45221-0171USA;1. L.V. Kirensky Institute of Physics, Siberian Department of RAS, 660036 Krasnoyarsk, Russia;2. Siberian Federal University, 660074 Krasnoyarsk, Russia;3. Krasnoyarsk State Agrarian University, 660049 Krasnoyarsk, Russia;4. Institute of Chemistry, Far Eastern Department of RAS, 690022 Vladivostok, Russia;1. L.V. Kirensky Institute of Physics, Siberian Department of RAS, 660036 Krasnoyarsk, Russia;2. Siberian Federal University, 660074 Krasnoyarsk, Russia;3. Institute of Chemistry, Far Eastern Department of RAS, 690022 Vladivostok, Russia;1. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia;2. Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, 660049 Krasnoyarsk, Russia;3. Astafijev Krasnoyarsk State Pedagogical University, 660049 Krasnoyarsk, Russia;4. Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660074 Krasnoyarsk, Russia;5. Institute of Chemistry, Far Eastern Department of RAS, 690022 Vladivostok, Russia |
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| Abstract: | The permeabilities, solubilities, and diffusivities of eight organophosphorus chemicals in silicone rubber were measured at saturation concentration using two different experimental methods: permeation experiments and absorption experiments. All tests were carried out at 25°C (±3°C). The eight organophosphorus chemicals investigated are dimethyl methylphosphonate, diethyl methylphosphonate, dimethyl hydrogenphosphonate, diethyl hydrogenphosphonate, trimethylphosphate, triethylphosphate, trimethylphosphite, and triethylphosphite. These eight chemicals were selected based on their similarities to organophosphorus chemicals used as pesticides and chemical warfare agents. The experimental data were analyzed using solutions of Fick's second law of diffusion and boundary conditions representative of the experimental settings. An unsteady-state diffusion model using boundary conditions that represent uniform initial concentration in the polymer and constant but different surface concentrations was used to interpret the permeation experimental data. In this model, the effective diffusivity calculated from the steady-state permeability and equilibrium solubility of each chemical was used and was assumed to be constant. |
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