National Institute for Occupational Safety and Health

“ Determine desorption efficiency (DE) at least once per year for each lot of Tenax GC used for sampling in the range of interest. Determine for three samplers at each of five concentrations plus three media blanks. a. Transfer front sorbent section of media blank sampler to a 5-mL vial. b. Inject known amount (1 to 10 μL) of allyl glycidyl ether or standard solution of allyl glycidyl ether in hexane directly into sorbent in vial with a microliter syringe. NOTE: Standard solutions for DE determination should not contain internal standard. c. Cap the tube. Allow to stand overnight. ”

“ Allyl glycidyl ether is flammable (flash point = 57 °C) and a moderate skin and severe eye irritant [3] . Diethyl ether is a serious fire and explosion hazard (flash point = -45 °C) and may form explosive peroxides during storage. All work with these compounds must be done in a hood.
SAMPLING: 1. 2. 3. 4.
Calibrate each personal sampling pump with a representative sampler in line. Break the ends of the sampler immediately before sampling. Attach sampler to personal sampling pump with flexible tubing. ”

“ Gas chromatograph, FID, integrator, and column (page 2545-1) . 4. Vials, 5-mL, with PTFE-lined crimp caps. 5. Microliter syringes, 10-μL and convenient sizes for making dilutions. 6. Flasks, volumetric, 10-mL. 7. ”