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Methods for sampling and determining chlorotrifluoroethylene (CTFE) in air.
American Industrial Hygiene Association Journal
|June 1, 1984
Summary
Two new methods for sampling chlorotrifluoroethylene (CTFE) were developed. The charcoal adsorption method is recommended for its superior recovery and storage stability.
Area of Science:
- Industrial Hygiene
- Analytical Chemistry
Background:
- Chlorotrifluoroethylene (CTFE) is an industrial chemical requiring accurate monitoring.
- Existing methods may not adequately capture CTFE concentrations exceeding 1 ppm.
Purpose of the Study:
- To develop and compare two novel methods for sampling and analyzing CTFE.
- To determine the efficacy and reliability of each method for occupational exposure assessment.
Main Methods:
- Method 1: Air collection in bags followed by gas chromatographic (GC) analysis with flame ionization detection (FID).
- Method 2: Adsorption of CTFE onto charcoal, followed by toluene desorption and GC/FID analysis.
Main Results:
- Method 1 achieved >90% analyte recovery, even after five days of sample storage.
- Method 2 demonstrated >90% desorption efficiency and >90% analyte recovery from stored charcoal tubes.
- Field spike recoveries averaged 94%, with no significant breakthrough observed using an 800 ppm CTFE challenge.
Conclusions:
- The charcoal adsorption method offers excellent recovery and stability for CTFE sampling.
- The charcoal procedure is recommended over the bag method due to its practical advantages and performance.