National Institute for Occupational Safety and Health

“ Prepare a graph of DE vs. μg analyte recovered.
MEASUREMENT: 11. Set gas chromatograph according to manufacturer’s recomm endations and to conditions given on page 2537-1. Inject a 1-μL sample aliquot manually using the solvent flush technique or with an auto sam pler. NOTE: If peak area is above the linear range of the working standards, dilute with the carbon disulfide solvent, reanalyze and apply the appropriate dilution factor corrections in the calculations. 12. Measure peak areas. ”

“ Carbon disulfide is toxic and a dangerous fire and explosion hazard (flash point = -30°C) so work in a hood is mandatory. Methyl and ethyl methacrylate are strong irritants and lachrymators.
SAMPLING: 1. Calibrate each personal sampling pump with a representative sampler in line. 2. Break the ends of the sampler imm ediately before sampling. Attach sampler to personal sampling pump with flexible tubing. 3. ”

“ Ad d 2.0 m L of carbon disulfide to each vial and cap securely. 7. Place each vial in a sonication bath for 30 minutes. 8. After sonication, transfer aliquots from each sample to 2 mL autosam pler vials and attach crimp caps.
CALIBRATION AND QUALITY CONTRO L: 9. Ca librate daily with at leas t six wo rking standa rds from below the LOD to 10 times the LO Q. If necessary additional standards may be added to extend the calibration curve. a. Add known amounts of calibration standards to carbon disulfide solvent in 10-mL volumetric flasks and dilute to the mark. b. ”