Record Display for the EPA National Library Catalog


Main Title Evaluating and optimizing electron microscope methods for characterizing airborne asbestos /
Author Samudra, A. V. ; Bock, F. C. ; Harwood, C. F. ; Stockham., J. D. ;
Other Authors
Author Title of a Work
Samudra, Anant V.
CORP Author IIT Research Inst., Chicago, Ill.;Environmental Sciences Research Lab., Research Triangle Park, N.C.
Publisher Environmental Sciences Research Laboratoires, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1978
Report Number EPA/600/2-78/038; EPA-68-02-2251
Stock Number PB-284 828
OCLC Number 04751926
Subjects Asbestos
Additional Subjects Asbestos ; Electron microscopy ; Electron diffraction ; Air pollution ; Sampling ; Performance evaluation ; Gas analysis ; Graphs ; Chemical analysis ; Regression analysis ; Particle size distributions ; Chemical analysis ; Concentration(Composition) ; Serpentine ; Natural fibers ; Comparison ; Air pollution detection ; Air pollution sampling ; Transmission electron microscopy ; Scanning electron microscopy ; Chrysotile ; Procedures
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600-2-78-038 c.1 Headquarters Library/Washington,DC 06/09/2014
ELBD ARCHIVE EPA 600-2-78-038 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ERAD  EPA 600/2-78-038 Region 9 Library/San Francisco,CA 09/24/2012
NTIS  PB-284 828 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation xv, 182 p. : ill. ; 28 cm.
Evaluation of EM methods for measuring airborne asbestos fiber concentrations and size distributions was carried out by studying a large number of variables and subprocedures in a five-phase program using elaborate statistically designed experiments. Observations were analyzed by advanced regression techniques to evaluate the effects of independent variables and subprocedures. It was shown that the optimized method for estimating airborne chrysotile should have the following features: (a) collecting an air sample on Nuclepore filter; (b) coating the Nuclepore filter with carbon; (c) transferring the particulate deposit to a 200-mesh electron microscope grid using chloroform in a modified Jaffe-wick washer; (d) examining the grid at about 10,000 x magnification (20,000 x for counting very fine fibers); (e) counting fibers using a field of view method; and (f) identifying the type of asbestos from morphology and selected area electron diffraction. A provisional manual of instructions was prepared (PB-276 481) and six independent laboratories participated in an interlaboratory test of the proposed method using two air samples. One of these was prepared at IITRI from pure aerosolized UICC chrysotile, and the other was an ambient air sample collected by IITRI personnel in a factory processing asbestos. Intercomparison of the results from the separate laboratories yielded some preliminary estimates of the precision and accuracy of the provisional method.