NIOSH Manual of Analytical Methods: Sampling and Analytical Methods for Monitoring Occupational Exposures to Toxic Substances in Air and Biological Samples |
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15 August ACCURACY acetate ACGIH acid aerosol air sample aliquot Analytical Methods asbestos benzidine BIAS bioaerosol blanks per set bubbler Calculate Calibrate each personal CALIBRATION AND QUALITY calibration graph calibration stock solution caps carbon Carbon disulfide carcinogen cassette chloride column concentration deionized water Department of Health detector determined DICHLORODIFLUOROMETHANE dilute ELEMENTS by ICP eluent ester ESTIMATED LOD ether EVALUATION OF METHOD fiber field blanks flexible connecting tubing gas chromatograph GC-FID CCT glass wool HPLC HYDROCARBONS INTERFERENCES KETONES L/min laboratory Manual of Analytical MCEF MEASUREMENT methanol METHYL mg/m³ NIOSH NIOSH Manual NIOSH/DPSE OSHA OVERALL PRECISION oxide P&CAM particles peak area personal sampling pump Pipets PTFE Publ QUALITY CONTROL RANGE STUDIED recovery representative sampler RTECS SAMPLE PREPARATION SAMPLE STABILITY sampler sampler in line SHIPMENT silica gel sorbent SORBENT TUBE SPECIAL PRECAUTIONS spikes syringe TECHNIQUE toluene U.S. Department vial VOL-MIN VOLATILE ORGANIC COMPOUNDS Volumetric flasks µg per sample
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Page 205 - NOTE.— When counting a field, continuously scan a range of focal planes by moving the fine focus knob to detect very fine fibers which have become embedded in the filter. The small-diameter fibers will be very faint but are an Important contribution to the total count. Calculations 21. Calculate and report fiber density on the filter, E (fibers/mm2); by dividing the total fiber count, F; minus the mean field blank count, B, by the number of fields, n; and the field area. A, (0.00785 mm' for a properly...
Page 107 - Andersen, AA, New Sampler for the Collection, Sizing and Enumeration of Viable Airborne Particles.
Page 247 - Fasten the sampler to the worker's lapel as close as possible to the worker's mouth. Remove the top cover from the end of the cowl extension (open face) and orient face down. Wrap the joint between the extender and the monitor's body with shrink tape to prevent air leaks. 3. Submit at least two blanks (or 10% of the total samples, whichever Is greater) for each set of samples. Remove the caps from the field blank cassettes and store the caps and cassettes In a clean' area (bag or box) during the...
Page 234 - P= average of the two fiber counts and s,= relative standard deviation, which should be derived by each laboratory based on historical in-house data. NOTE: If a pair of counts is rejected as a result of this test, recount the remaining samples in the set and test the new counts against the first counts. Discard all rejected paired counts. 16. Enroll each new counter in a training course that compares performance of counters on a variety of samples using this procedure. NOTE: To ensure good...
Page 231 - ... (Type G-22). Note. — the graticule is custom-made for each microscope. 12. HSE/NPL phase contrast test slide, Mark II. 13. Telescope, ocular phase-ring centering. 14. Stage micrometer (0.01 mm divisions). Sampling 1. Calibrate each personal sampling pump with a representative sampler in line. 2. Fasten the sampler to the worker's lapel as close as possible to the worker's mouth. Remove the top cover from the end of the cowl extension (open face) and orient face down. Wrap the joint between...
Page 202 - Caution. The acetone vapor must be generated In a ventilated fume hood away from all open flames and spark sources. Alternate heating methods can be used, providing no open flame or sparks are present. 10. Mount either the whole sample filter or a wedge cut from the sample filter on a clean glass slide. a. Cut wedges of ca. 25 percent of the filter area with a curved-blade steel surgical knife using a rocking motion to prevent tearing. b. Place the filter or wedge, dust side up, on the slide. Static...
Page 203 - Using the hypodermic syringe with a 22gauge needle, place 1 to 2 drops of triacetin on the filter. Gently lower a clean 25-mm square cover slip down onto the filter at a slight angle to reduce the possibility of forming bubbles. If too many bubbles form or the amount of triacetin is insufficient, the cover slip may become detached within a few hours. e. Glue the edges of the cover slip to the glass slide using a lacquer or nail polish. Note. — If clearing is slow, the slide preparation may be heated...
Page 201 - ... dust particles may obscure fibers in the field of view and raise the detection limit. Reagents: 1. Acetone. 2. Triacetin (glycerol triacetate), reagent grade. Special Precautions: Acetone is an extremely flammable liquid and precautions must be taken not to ignite it. Heating of acetone must be done in a ventilated laboratory fume hood using a flameless. spark-free heat source. Equipment: 1.
Page 203 - Focus on the particulate material to be examined. c. Make sure that the field iris is in focus, centered on the sample, and open only enough to fully illuminate the field of view. d. Use the telescope ocular supplied by the manufacturer to...
Page 169 - Place a few milliliters of isopropanol in the reservoir. Vigorously hand shake the asbestos suspension and immediately withdraw an aliquot from the center of the suspension. Do not adjust the volume in the pipet by expelling part of the suspension; if more than the desired aliquot is withdrawn, discard the aliquot and resume the procedure with a clean pipet. Transfer the aliquot to the reservoir. Keep the tip of the pipet near the surface of the isopropanol.