Citation:

Brackett, K. AND P. Clark. COMPARISON OF THE EFFICIENCY OF POLYCARBONATE AND MIXED CELLULOSE ESTER FILTERS FOR USE IN THE FILTRATION OF WATER SAMPLES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/168 (NTIS PB93194363), 1993.

Description:

The federal standard for the presence of asbestos in drinking water mandates the use of transmission electron microscopy (TEM) as the only acceptable testing method. he July 17, 1992 Federal Register (57 FR 31839 SS 141.23 (K) (4) ) specifies that the analysis for asbestos shall be conducted by the EPA Protocol entitled "Analytical Method for Determination of Asbestos Fibers in Water" (EPA-600/4-83) developed by Chatfield and Dillon (1), using polycarbonate (PC) membrane filters. eparate document (1993) providing guidance and clarification of the Chatfield method has been peer reviewed, which allows some slight changes to what was originally a research method but still requires the use of PC filters. raft of an alternative method using mixed cellulose ester (MCE) membrane filters was recently published in The Microscope (2). he primary reason for the specification of PC membranes was a concern over the loss of fibers @ lam in length. his experiment was designed to determine the quantitative differences between the two methods for all fiber lengths as well as for the regulated fibers > 10 um in length.

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