National Institute for Occupational Safety and Health

“ Prepare calibration graph (peak height vs. μg propylene dichloride) . 11.
Determine desorption efficiency (DE) at least once for each batch of charcoal used for sampling in the calibration range (step 10) . 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 a known amount (1 to 20 μL) of calibration stock solution, or a serial dilution thereof, directly onto front sorbent section with a microliter syringe. c. Cap the tube. Allow to stand overnight. d. ”

“ Electrolyte solution for Hall detector: 2-propanol and distilled, deionized water, 50% (v/v) . 8.
Calibration stock solution, 34.7 mg/mL. Dilute 3.00 mL (3.47 g) 1,2-dichloropropane to 100 mL with eluent. Stable indefinitely at room temperature in airtight container. ”

“ Propylene dichloride vapor is a narcotic and an eye irritant [3] . Acetone and cyclohexane are extremely flammable. Work with these in a fume hood. SAMPLING: 1.
Calibrate each personal sampling pump with a representative sampler in line. 2.
Break the ends of the sampler immediately before sampling. Attach sampler to personal sampling pump with flexible tubing. 3. ”