National Institute for Occupational Safety and Health

“ Determine the average recovery (R) of Kepone from filters. a. Fortify six filters with about 7 μL of 50 μg/mL calibration stock solution. b. Allow the filters to air dry. c. Prepare samples according to steps 5 through 7. d. Analyze samples with standards according to steps 13 through 15. e. Calculate the average recovery, R (mass of Kepone found divided by mass of Kepone applied) . Determine the average recovery of Kepone from impingers. a. Fortify each of six impingers containing 15 mL 0.1 M NaOH solution with 100 μL 1-μg/mL impinger recovery stock solution. ”

“ Methanol and benzene are flammable. Benzene and Kepone [3] are carcinogens. SAMPLING: 1. 2. 3. 4.
Connect the outlet of the impinger containing 15 mL 0.1 M NaOH and the inlet of the sampling pump to an empty impinger without a stem to protect the sampling pump from splash over. Calibrate the sampling pump with a representative sampler in line. Sample at an accurately known flow rate between 0.5 and 1 L/min for a total sample size of 50 to 600 L. Do not exceed 2 mg total dust loading on the filter. Separate the filter cassette and impinger for shipment to the laboratory. ”

“ Personal and area samples (45 to 84 L) were collected by this method at a Mirex formulation plant. Mirex was found on filters in quantities of 240 to 1240 μg and in impingers in quantities of 0.3 to 16 μg. ”