Ethylene loss from the gas phase of container-seal systems [ethylene permeation, ammonium sulphate solution, saturated salt solution, silicone rubber, neoprene rubber, nitrite rubber, butyl rubber, permeability]
1980
Nelson, N.D. | Isebrands, J.G. (U.S. Forest Service, Rhinelander, Wisconsin (USA). Forestry Sciences Lab.) | Rietveld, W.J.
Ethylene losses from the gas phase of various container-seal systems were studied to develop acceptable methods for containing ethylene during experiments. Ethylene at an initial amount of 104 micro-1/l was stored in glass vials at near atmospheric pressure for 20 h at 25-27 deg C and at 35 per cent relative humidity external to the vials. Crimped serum vials sealed with saturated (NH(,4))(,2)SO(,4) solution, neoprene rubber septra, nitrile rubber (Hycar) septa lost ethylene at the rate of 1.8, 10.2, 16.2, 16.5, and 40.2 nl m('2)/s, respectively, over the 20-h period. Screw-capped reaction vials sealed with white silicone rubber septa lost ethylene at the rate of 30.2 nl m('-2)/s. The (NH(,4))(,2)SO(,4) solution was utilized as a seal by inverting a vial so that the salt solution covered the internal surface of the vial septum. Saturated (NH(,4))(,2)SO(,4) solution is an effective seal. Silicone rubber should be avoided as a seal in systems for containing ethylene. Ethylene production values in the literature may be underestimated where silicone rubber seals have been used
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