National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Calibrate daily with at least six working standards over the range of interest. a. Dilute aliquots of calibration stock solution (QTM Test Mixture) with DMSO. b. Analyze working standards and blanks (Steps 12 through 15) . Intersperse standards among the samples. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Some applications of the data need only total PACs per sample rather than total PACs per individual medium. In these cases, thefilters and sorbent section may be combined into the same screw-capped test tube as a single sample. Remove the samples from the refrigerator and allow to equilibrate to ambient temperature. Extract filters. a. Transfer the filter using forceps to a 16 x 100 mm screw capped test tube. b. Add 4 mL of hexane. c. Rotate the sample for at least 12 hours using a 360 rotator. NOTE: Minimize exposure to light during extraction step. Extract solid sorbent tubes. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Inject 25 μL of the sample into the solvent stream. 15. Measure peak areas. CALCULATIONS: NOTE: The mass of total PACs measured at each set of wavelengths is considered a separate analysis. Therefore, the establishment of calibration curves and data analysis are independent for each detector. 16. From the calibration graphs, read the mass (μg corrected for R or DE) of total PACs measured at each wavelength setting found on the filter (Wfil) , front sorbent section (Wsf) , and back sorbent section (Wsb) and on the average media blank filter (B fil) and sorbent tube sections (B sf and Bsb) . 17. ”
