National Institute for Occupational Safety and Health

“ Spike a known amount of calibration stock solution directly onto the filter with a microliter pipet or syringe. b. Allow to stand overnight in the dark. c. Extract (steps 4 through 6) and analyze together with working standards (steps 10 and 11) . d. Prepare graph of recovery vs. mg o-terphenyl recovered. Analyze three quality control blind spikes and three analyst spikes to ensure that the calibration graph and recovery graph are in control. ”

“ Beakers, 50-mL. Centrifuge tubes, graduated, calibrated at 0.5 mL. Volumetric flasks, 10- and 100-mL. Pipets, 1.0 to 100-μL. Syringe, 10-μL, readable to 0.1 μL.
SPECIAL PRECAUTIONS: Exposure to terphenyls may cause eye, skin, and respiratory irritation [3] . ”

“ Carbon disulfide presents a severe hazard owing to its toxic properties and fire and explosion potential (flash point = -30 °C) . All work with this solvent should be performed in a fume hood. Hexane has a flash point = -22 °C.
SAMPLING: 1. 2. 3.
Calibrate each personal sampling pump with a representative sampler in line. Sample at an accurately known flow rate between 1 and 3 L/min for a total sample size of 2 to 30 L. Transfer the filter from the cassette within 1 h of sampling to a clean vial. Handle the filter only with clean tweezers.
SAMPLE PREPARATION: 4. 5. 6. ”