Page:NIOSH Manual of Analytical Methods - 7404.pdf/2

 CEL LULO SE INS ULA TIO N: ME TH OD 7404, Issue 1, dated 1 5 Ma rch 2003 - page 2 of 6 EQUIPMENT:

REAG ENT S: 1. Colloidal Graphite.*


 * (See SP EC IAL P RE CA UT ION S.)

1. Sam pler: field monitor, 25-mm, three- piece cassette with ca. 50-m m electrically conductive exten sion cow l and polycarbonate filter, 0.45- to 1.2-um pore size, and backup pad. NOT E 1: Analyze representative filters for fiber b ack grou nd b efore us e. This is needed when field blanks contain fibers. NOT E 2: The electrically conductive extension cowl reduces electrostatic effects. Ground the cowl when possible during sampling. 2. Personal sampling pump, battery or linepowered vacuum, of sufficient capacity to m eet flow rate requireme nts (see step 4), with flexible connecting tubing. 3. Microscope, scanning electron, operated at 15Kv with viewing screen having an inscribed or overlain calibrated scale. 4. Tap e, shrink- or adhes ive-. 5. Tweezers. 6. 25-mm carbon disk planchets. 7. Co lloidal graphite p aint. 8. Grounding wire, 22-gauge, multi strand. 9. Sputter coater.

SPECIAL PRECAUTIONS: Colloidal graphite contains isopropanol, which is flamm able. Take precautions not to ignite it. Use only in well ventilated area. SAMPLING: 1. Calibrate each personal sampling pump with a representative sampler in line. 2. Fasten the (uncapped) open-face cassette to the worker’s lapel. The open fac e should be oriented downward. W rap joint between extender and m onitor bod y with tape to keep the joint clean and prevent contamination when disassembled. W here possible, especially at low %RH, attach sampler to electrical ground to reduce electrostatic effects during sampling. 3. Su bm it at least 2 field blanks (or 10% of total samples, whichever is greater) for each set of samples. Rem ove top covers from field blank cassettes and store top covers and cas settes in a c lean area (e.g., a closed bag or box) during sampling. Replace top covers when sampling is completed. 4. Sam ple at 1L/min. NOTE: If the cellulose insulation is being applied dry, sam ple for a shorter period time than if the application is wet. Obtain two personal samples per worker. Sample at same flow rate but for different dura tions. A m inim um dura tion of 1 m inute is app ropriate for very dusty environments. The longer du ration should be dete rm ined by the overall dustiness, size of the area being insulated a nd o ther fa ctors as w ell. 5. At the end of sampling, replace top cover and end plugs. 6. Ship samples with conductive cowl attached in a rigid containe r with pack ing m aterial to m inim ize jostling or da m age. NOTE: Do not use untreated polystyrene foam in the shipping container because electrotatic forces may cause fiber loss from sam ple filter.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition