National Institute for Occupational Safety and Health

“ Calibrate daily with at least six working standards over the range of 7 to 210 μg per sample. a. Add known amounts of calibration stock solution to carbon disulfide in 10-mL volumetric flasks and dilute to the mark. b. Analyze working standards together with samples and blanks (steps 13 and 14) . c. Prepare a calibration graph of area vs. μg of analyte per sample. Determine desorption efficiency (DE) for each lot of charcoal tubes used for sampling in the concentration range of interest. ”

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

“ Phenyl ether is toxic by inhalation. All work with carbon disulfide should be performed in a hood because of its high toxicity and flammability (flash point = -30 °C) .
SAMPLING: 1. 2.
3. 4. 5. 6.
Calibrate each personal sampling pump with a representative sampler in line. Immediately before sampling, break the ends of the tube to provide an opening at least one-half the internal diameter of the tube (2 mm) . Attach sampler to personal sampling pump with flexible tubing. Sample 1 to 50 L of air at an accurately known flow rate between 0.01 and 0.2 L/min. ”