National Institute for Occupational Safety and Health

“ Carbon disulfide is toxic and a dangerous fire and explosion hazard (flash point = -30 °C) . Propylene oxide is a suspect carcinogen and is extremely flammable (flash point = -37 °C) [4] . Hexane is extremely flammable. Work with these only 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. ”

“ Inject sample aliquot manually using solvent flush technique or with autosampler. NOTE: If peak area is above the linear range of the working standards, dilute with CS 2, reanalyze, and apply the appropriate dilution factor in calculations. ”

“ Calibrate daily with at least six working standards over the range 0.01 to 3 mg propylene oxide (PrO) per sample. a. Add known amounts of PrO or calibration stock solution to CS 2 in 10-mL volumetric flasks and dilute to the mark. b. Analyze together with samples and blanks (steps 11 and 12) . c. Prepare calibration graph (peak area vs. mg PrO) . Determine desorption efficiency (DE) at least once for each lot of charcoal used for sampling in the calibration range (step 8) . Prepare three tubes at each of five levels plus three media blanks. a. ”