National Institute for Occupational Safety and Health

“ Petroleum ether is highly flammable. Prepare samples and standards in well-ventilated hood. Overexposure to chlorinated camphene may cause nausea, mental confusion, and unconsciousness; contact with chlorinated camphene solutions may cause skin irritation [4] .
SAMPLING:
1. Calibrate each personal sampling pump with a representative sampler in line. 2. Sample at an accurately known flow rate between 0.2 and 1 L/min for a sample size of 2 to 30 L. 3. ”

“ Carefully transfer the filter and backup pad to a screw cap vial by means of tweezers.
SAMPLE PREPARATION:
4. Pipet 10 mL petroleum ether into each vial and seal. 5. Gently swirl the vial to wet the filter and backup pad. Allow to stand 30 min.
CALIBRATION AND QUALITY CONTROL: 6.
7.
8.
Calibrate daily with at least six working standards. a. Add known amounts of calibration stock solution to petroleum ether in 10-mL volumetric flasks and dilute to the mark to obtain concentrations in the range 0.14 to 14 μg chlorinated camphene/10 mL. b. Analyze with samples and blanks (steps 9 and 10) . ”

“ Chlorinated camphene* (toxaphene) . 2. Petroleum ether*, 30 to 60 °C, suitable for pesticide residue analysis. 3. Nitrogen, purified. 4. Calibration stock solution, 0.1 mg/mL. Dissolve 5 mg of chlorinated camphene in 50 mL petroleum ether.
See SPECIAL PRECAUTIONS. EQUIPMENT:
1. Sampler: 37-mm cellulose ester membrane filter (0.8-μm pore size) supported by a cellulose backup pad in a three-piece filter holder. Do not use tenite filter holders. 2. Personal sampling pump, 0.2 to 1 L/min, with flexible connecting tubing. 3. Gas chromatograph, 63Ni ECD, integrator, and column (page 5039-1) . 4. ”