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ASBESTOS and OTHER FIBERS by PCM:METHOD 7400,Issue 2,dated 15 August 1994-Page 11 of 15
<br /> The curves in Figure 1 are defined by the following equations:
<br /> _2X+2.25+[(2.25+2X)2-4(1-2.25S;)X2]'1'
<br /> Ua and
<br /> 2(1-2.25Sr)
<br /> _2X+4-[(4+2X)2-4(1-45;)X2]'/2
<br /> La 2(1-45r )
<br /> where Sr= subjective interlaboratory relative standard deviation,which is close to the total
<br /> interlaboratory Sr when approximately 100 fibers are counted,
<br /> X =total fibers counted on sample,
<br /> LcL =lower 95%confidence limit,and
<br /> UcL= upper 95%confidence limit.
<br /> Note that the range between these two limits represents 90%of the total range.
<br /> REFERENCES:
<br /> [1] Leidel,N.A.,S.G.Bayer,R.D.Zumwalde,and K.A.Busch.USPHS/NIOSH Membrane Filter Method
<br /> for Evaluating Airborne Asbestos Fibers,U.S. Department of Health,Education,and Welfare,Publ.
<br /> (NIOSH)79-127(1979).
<br /> [2] Baron, P.A.and G.C.Pickford."An Asbestos Sample Filter Clearing Procedure,"Appl.Ind.Hyg., 1,
<br /> 169-171, 199(1986).
<br /> [3] Occupational Safety and Health Administration,U.S.Department of Labor,Occupational Exposure
<br /> to Asbestos,Tremolite,Anthophyllite,and Actinolite Asbestos;Final Rules,29 CFR Part 1910.1001
<br /> Amended June 20, 1986.
<br /> [4] Rooker,S.J.,N.P.Vaughn,and J.M.LeGuen."On the Visibility of Fibers by Phase Contrast
<br /> Microscopy,"Amer.Ind.Hyg.Assoc.J.,43,505-515 (1982).
<br /> [5] Baron,P.and G.Deye,"Electrostatic Effects in Asbestos Sampling,"Parts I and II,Amer.Ind.Hyg.Assoc.
<br /> J.,51,51-69(1990).
<br /> [6] Johnston,A.M.,A.D.Jones,and J.H.Vincent."The Influence of External Aerodynamic Factors
<br /> on the Measurement of the Airborne Concentration of Asbestos Fibers by the Membrane Filter
<br /> Method;'Ann.Occup.Hyg.,25,309-316(1982).
<br /> [7] Beckett,S.T.,"The Effects of Sampling Practice on the Measured Concentration of Airborne
<br /> Asbestos,"Ann.Occup.Hyg.,21,259-272(1980).
<br /> [8] Jankovic,J.T.,W.Jones,and J.Clere."Field Techniques for Clearing Cellulose Ester Filters Used in
<br /> Asbestos Sampling,
<br /> "Appl.Ind.Hyg., 1, 145-147(1986).
<br /> [9] Crawford, N.P.,H.L.Thorpe,and W.Alexander."A Comparison of the Effects of Different Counting
<br /> Rules and Aspect Ratios on the Level and Reproducibility of Asbestos Fiber Counts,"Part I:Effects
<br /> on Level (Report No.TM/82/23),Part II:Effects on Reproducibility(Report No.TM/82/24),Institute of
<br /> Occupational Medicine,Edinburgh,Scotland (December, 1982).
<br /> [10] NIOSH Manual of Analytical Methods,2nd ed.,Vol. 1.,P&CAM 239,U.S.Department of Health,
<br /> Education,and Welfare,Publ.(NIOSH) 77-157-A(1977).
<br /> [11] Revised Recommended Asbestos Standard,U.S.Department of Health,Education,and Welfare,
<br /> Publ.(NIOSH) 77-169(1976);as amended in NIOSH statement at OSHA Public Hearing,June 21,
<br /> 1984.
<br /> [12] Asbestos International Association,AIA Health and Safety Recommended Technical Method#1
<br /> (RTMI)."Airborne Asbestos Fiber Concentrations at Workplaces by Light Microscopy"(Membrane
<br /> Filter Method),London (1979).
<br /> [13] Abell,M.,S.Shulman and P.Baron."The Quality of Fiber Count Data;'App1.Ind.Hyg.,4,273-285
<br /> (1989).
<br /> [14] "A Study of the Empirical Precision of Airborne Asbestos Concentration Measurements in the
<br /> Workplace by the Membrane Filter Method,"Asbestos Information Association,Air Monitoring
<br /> Committee Report,Arlington,VA(June, 1983).
<br /> NIOSH Manual of Analytical Methods(NMAM),Fourth Edition
<br />
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