National Institute for Occupational Safety and Health

“ Calibrate daily with at least six working standards. a. Add known amounts of calibration stock solution to CS 2 in 10-mL volumetric flasks and dilute to the mark. Prepare working standards in the range 10 to 100 μg vinylidene chloride/mL. b. Analyze with samples and blanks (steps 11 and 12) . c. Prepare calibration graph (peak area or peak height vs. μg vinylidene chloride) . Determine desorption efficiency (DE) at least once for each batch of charcoal used for sampling in the range of interest. ”

“ Vinylidene chloride is a suspect carcinogen [3] . Carbon disulfide and vinylidene chloride are toxic and severe fire and explosion hazards (flash point = -30 °C for CS 2 and -10 °C for vinylidene chloride) . Work with both compounds only in a hood. Vinylidene chloride polymerizes above 0 °C, especially in the presence of oxygen or catalysts; explosive reaction products may result [4] .
SAMPLING: 1. 2. 3. 4.
Calibrate each personal sampling pump with a representative sampler in line. Break the ends of the sampler immediately before sampling. ”

“ Attach sampler to personal sampling pump with flexible tubing. Sample at an accurately known flow rate between 0.01 and 0.2 L/min for a total sample size of 2.5 to 7 L. Cap the samplers. Pack securely for shipment. NOTE: Refrigerated shipment will decrease migration of vinylidene chloride to back sorbent section.
SAMPLE PREPARATION: 5. 6. 7.
Allow samples to equilibrate to room temperature before uncapping. Place the front and back sorbent sections of the sampler tube in separate vials. Add 1.0 mL CS 2 to each vial. Cap vial immediately. Allow to stand 30 min with occasional agitation. ”