Page:NIOSH Manual of Analytical Methods - 1007.pdf/2

 VINYL CHLORIDE: METHOD 1007, Issue 2, dated 15 August 1994 - Page 2 of 4 REAGENTS: 1. 2. 3.

4. 5. 6.

EQUIPMENT:

Carbon disulfide,* chromatographic quality. Vinyl chloride,*, 99.9%, in lecture bottle fitted with valve and septum. Calibration stock solutions 0.26 mg/mL. a. Insert the tip of a gas syringe containing 1 mL vinyl chloride gas under the surface of 5 mL CS 2 in a 10-mL volumetric flask. b. Open the valve of the syringe and withdraw the plunger to pull CS 2 into the barrel. (As vinyl chloride dissolves, a vacuum will be created, pulling CS 2 into the syringe.) c. Push the solution from the syringe into the flask. Rinse the syringe twice with 1-mL portions of CS 2 and add the washings to the flask. d. Dilute to the mark with CS 2. Helium, purified. Hydrogen, purified. Air, filtered.



See SPECIAL PRECAUTIONS.

1. Sampler: two tandem glass tubes, 7 cm long, 6-mm OD, 4-mm ID, flame-sealed ends, each containing 150 mg of 20/40 mesh activated (600 °C) coconut shell charcoal. A silylated glass wool plug precedes the charcoal beds and a 3-mm urethane foam plug follows the charcoal beds. Plastic caps are included for sealing after use. Pressure drop across each tube at 1 L/min airflow must be less than 3.4 kPa. NOTE: A pair of two-section (100 mg/50 mg) tubes may be used. (SKC ST226-01, or equivalent). 2. Personal sampling pump, 0.05 L/min, with flexible connecting tubing. 3. Gas chromatograph, flame ionization detector, integrator and column (page 1007-1). 4. File. 5. Bent wire for removing plugs from sampling tube. 6. Vials, 2-mL, glass with PTFE-lined septa and crimp-on seals. 7. Volumetric flasks, 10-mL, with polyethylene stoppers. 8. Pipettes, delivery, 1.0-mL, graduated in 0.1-mL increments, 2- and 5-mL, with pipet bulb. 9. Air sampling bags, Tedlar, 10-L. 10. Gas syringe, with gas-tight valve, 0.1- and 1-mL. 11. Syringe, 10-µL, with 0.1-µL graduations.

SPECIAL PRECAUTIONS: Carbon disulfide is toxic and an acute fire and explosion hazard (flash SAMPLING: point = -30 °C); work with it only in a hood. Calibrate each personal sampling pump with a representative sampler in line. 2. Break the ends of the tubes immediately before sampling. Attach two tubes, with ends touching, with a short piece of tubing. Label one tube as the back tube and insert the back tube into the flexible tubing attached to the personal sampling pump. Sample at 0.05 L/min for 15 to 100 min. Do not sample more than 5 L of air. Separate the primary and backup tubes and cap each tube for shipment.

Vinyl chloride is a human carcinogen [3].

3. 4.

1.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94