Ethylene oxide pollution evaluation. Part I: sampling with active charcoal tubes.
Greff-G; Delcourt-J; Guenier-JP; Herve-Bazin-B; Muller-J
Chromatographia 1986 Apr; 21(4):201-204
The utility of air sampling of ethylene-oxide (75218) on active charcoal tubes followed by gas chromatographic analysis for the determination of ethylene-oxide levels was investigated, and the effects of relative humidity and temperature on the sampling were determined. The variations in trapping capacity at room temperature were investigated over a large range of concentrations, and a mathematical formulation which described the relationship between trapping capacity and concentration was developed. Mathematical equations were developed which defined the relationships of relative humidity and temperature to trapping capacity and concentration. Relative humidity was found to have marked effects on breakthrough time and trapping capacity as levels of ethylene-oxide decreased. Trapping capacity was lowered with increasing temperature. The effects of storage on ethylene-oxide conservation were also studied, and it was found that no loss occurred with up to 7 days of storage, but loss and migration were apparent after 7 days. This method proved inadequate for determination of low pollution levels of ethylene-oxide around 2mg/m3. The authors conclude that sampling of ethylene-oxide on active charcoal tubes is not adequate to allow control of the proposed threshold limit value of 1 part per million.
NIOSH-Author; Oxides; Chromatographic-analysis; Analytical-methods; Gas-chromatography; Air-sampling; Air-contamination; Industrial-processes; Threshold-limit-values; Ethylenes;