National Institute for Occupational Safety and Health

“ EQUIPMENT:
Methyl acetate (reagent grade) . Carbon disulfide (chrom. grade) . Prepurified helium. Hydrogen, prepurified. Decane, reagent grade, or other suitable internal standard. Air, filtered, compressed. ”

“ Break the ends of the sampler immediately before sampling. Attach sampler to personal sampling pump with flexible tubing. Sample at an accurate flow rate between 0.01 and 0.2 L/min for a total sample size of 0.2 to 10 L. Cap the samplers with plastic caps and pack securely for shipment with bagged refrigerant.
SAMPLE PREPARATION: 5. 6. 7.
Place the front and back sorbent sections of the sampler tube in separate vials. Add 1.0 mL to CS 2 to each vial and attach a crimp cap to each vial. Allow to stand 30 minutes with occasional agitation. ”

“ Calibrate daily with at least six working standards over the range 2 to 2000 μg analyte per sample. a. Add known amounts of analyte 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. μg methyl acetate) . 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 concentrations plus three media blanks. a. ”