National Institute for Occupational Safety and Health

“ Prepare calibration graph (peak area or height vs. ng hexachloro-1,3-cyclopentadiene) . 9. Determine desorption efficiency (DE) at least once for each lot of Porapak T used for sampling in the range 25 to 12,500 ng hexachloro-1,3-cyclopentadiene per sample. Prepare three tubes at each of five levels plus three media blanks. a. Prepare five DE standard solutions in the range 5 to 2500 μg/mL by diluting aliquots of 20 mg/mL stock solution with hexane. b. Inject 5 μL of a DE standard solution directly into a media blank front sorbent section with a microliter syringe. ”

“ Hexane, acetone and methanol are flammable. Hexachloro-1,3-cyclopentadiene is highly toxic and can be absorbed through the skin. Wear gloves, avoid inhalation of vapors and protect solvents from sparks and flames.
SAMPLING: 1. 2. 3. ”

“ Samplers are commercially available. 2. Personal sampling pump, 0.01 to 0.2 L/min, with flexible connecting tubing. 3. PTFE tape. 4. Gas chromatograph, 63Ni ECD, integrator and column (page 2518-1) . 5. ”