National Institute for Occupational Safety and Health

“ Prepare calibration graph (peak height or area vs. μg diphenyl per sample) . Determine desorption efficiency (DE) at least once for each lot of sorbent used for sampling in the range of interest. Prepare three tubes at each of five levels plus three media blanks. a. Remove and discard back sorbent section of a media blank sampler. b. Inject 2 to 10 μL of DE stock solution (or of a serially diluted solution in hexane) directly onto front sorbent section with a microliter syringe. c. Cap the tube. Allow to stand overnight. ”

“ Balance, readable to 0.1 mg.
SAMPLING: 1.
Calibrate each personal sampling pump with a representative sampler in line. 2. Break the ends of the sampler tube immediately before sampling. Attach sampler to personal sampling pump with flexible tubing. Sample at an accurately known flow rate between 0.01 and 0.5 L/min for a total sample size of 15 to 30 L. Cap the samplers. Pack securely for shipment.
SAMPLE PREPARATION: 5. 6. 7.
Place the front and back sorbent sections of the sampler tube in separate vials. Discard the glass wool and foam plugs. Add 1.0 mL CCl 4 to each vial. ”

“ Gas chromatograph, FID, integrator, and column (see page 2530-1) . Vials, 2-mL, PTFE-lined caps. Syringe, 10-μL, readable to 0.1 μL. Volumetric flasks, 10- and 100-mL. Pipets, 1-mL, and other convenient sizes. ”