| Main Title |
Comparison of airborne asbestos levels determined by transmission electron microscopy (TEM) using direct and indirect transfer techniques : final report {MICROFICHE} / |
| Author |
Chesson, J.;
Hatfield, J.
|
| CORP Author |
Chesson Consulting, Washington, DC. ;Battelle, Arlington, VA.;Environmental Protection Agency, Washington, DC. Office of Toxic Substances. |
| Publisher |
Exposure Evaluation Division, Office of Toxic Substances, Office of Pesticides and Toxic Substances, U.S. Environmental Protection Agency, |
| Place Published |
Washington, D.C. : |
| Year Published |
1992 |
| Report Number |
EPA-68-02-4294; EPA/560/5-89/004 |
| Stock Number |
PB92-191113 |
| OCLC Number |
45896487 |
| Subjects |
Asbestos;
Air pollution detection;
Transmission electron microscopy;
Indoor air pollution;
School buildings;
Air pollution monitoring;
Occupational safety and health;
Air pollution abatement;
Comparison;
Reliability
|
| Subject Added Ent |
Asbestos dust--Measurement;
Transmission electron microscopes
|
| Internet Access |
|
| Holdings |
| Library |
|
Call Number |
Additional Info |
Location |
Date Modified |
| ERBD |
|
PB92-191113 |
|
NERL/ESD-LV Library/Las Vegas,NV |
02/23/2001 |
| NTIS |
|
PB92-191113 |
Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. |
NTIS |
01/01/1988 |
|
| Collation |
xii, 56 p. : ill. ; 28 cm. |
| Abstract |
A subset of air samples from a 1988 EPA study was reanalyzed for asbestos by TEM using an indirect transfer technique. The samples were originally analyzed using a direct transfer technique. The document presents the results of the reanalysis and extends the discussion to include data from six other studies. The development of the two techniques and their respective advantages and disadvantages are described. The data support the general opinion that TEM analysis of air samples using indirect transfer methods tends to provide estimates of total airborne asbestos structure concentration that are higher than those obtained using direct transfer methods. There is no single factor that can be used to convert measurements made by one method to a value that is comparable with measurements made by the other because the quantitative relationship is expected to depend on details of the sampling and analytical protocols and the nature of the asbestos in the air. The ratio of indirect measurements to direct measurements ranges from 3.8 to 1,700 for the studies considered. Additional research is needed to determine which transfer technique more accurately reflects biologically meaningful airborne asbestos concentrations. Breakdown of larger structures into smaller ones during indirect preparation does not appear to be sufficient to explain the difference in measured concentrations. |
| Notes |
Spine title: Transmission electron microscopy using direct and indirect techiques. "EPA 560/5-89-004." "March 1990." Microfiche. |
| Supplementary Notes |
See also PB90-171778. Prepared in cooperation with Battelle, Arlington, VA. Sponsored by Environmental Protection Agency, Washington, DC. Office of Toxic Substances. |
| Corporate Au Added Ent |
United States. Environmental Protection Agency. Office of Toxic Substances. Exposure Evaluation Division. ; Chesson Consulting. ; Battelle Memorial Institute. |
| PUB Date Free Form |
1990. |
| Ti Tra Differently |
Transmission electron microscopy using direct and indirect techiques. |
| NTIS Prices |
PC A04/MF A01 |
| BIB Level |
m |
| OCLC Time Stamp |
20010212165408 |
| Cataloging Source |
OCLC/T |
| Language |
eng |
| Origin |
OCLC |
| Type |
MERGE |
| OCLC Rec Leader |
01460nam 2200289Ka 45020 |
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