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ASBESTOS and OTHER FIBERS by PCM:METHOD 7400,Issue 2,dated 15 August 1994-Page 2 of 15 <br /> REAGENTS: EQUIPMENT: <br /> 1. Acetone,*reagent grade. 1. Sampler:field monitor,25-mm,three-piece <br /> 2. Triacetin(glycerol triacetate),reagent grade. cassette with ca.50-mm electrically conductive <br /> extension cowl and cellulose ester filter,0.45- <br /> *See SPECIAL PRECAUTIONS. to 1.2-µm pore size,and backup pad. <br /> NOTE 1:Analyze representative filters for fiber <br /> background before use to check for <br /> clarity and background.Discard the <br /> filter lot if mean is>_5 fibers per 100 <br /> graticule fields.These are defined <br /> as laboratory blanks.Manufacturer- <br /> provided quality assurance checks on <br /> filter blanks are normally adequate as <br /> long as field blanks are analyzed as <br /> described below. <br /> NOTE 2:The electrically conductive extension <br /> cowl reduces electrostatic effects. <br /> Ground the cowl when possible <br /> during sampling. <br /> NOTE 3:Use 0.8-µm pore size filters for <br /> personal sampling.The 0.45-µm <br /> filters are recommended for sampling <br /> when performing TEM analysis on the <br /> same samples.However,their higher <br /> pressure drop precludes their use with <br /> personal sampling pumps. <br /> NOTE 4:Other cassettes have been proposed <br /> that exhibit improved uniformity of <br /> fiber deposit on the filter surface,e.g., <br /> bellmouthed sampler(Envirometrics, <br /> Charleston,SC).These may be <br /> used if shown to give measured <br /> concentrations equivalent to sampler <br /> indicated above for the application. <br /> 2. Personal sampling pump,battery or line- <br /> powered vacuum,of sufficient capacity to <br /> meet flow-rate requirements(see step 4 for <br /> flow rate),with flexible connecting tubing. <br /> 3.Wire,multi-stranded,22-gauge;1" hose clamp <br /> to attach wire to cassette. <br /> 4.Tape,shrink-or adhesive-. <br /> 5. Slides,glass,frosted-end,pre-cleaned,25-x <br /> 75-mm. <br /> 6.Cover slips,22-x 22-mm,No. 11/2,unless <br /> otherwise specified by microscope <br /> manufacturer. <br /> 7. Lacquer or nail polish. <br /> 8. Knife,#10 surgical steel,curved blade. <br /> 9.Tweezers. <br /> NIOSH Manual of Analytical Methods(NMAM),Fourth Edition <br />