Airborne Asbestos Method: Standard Test Method for Verified Analysis of Asbestos by Transmission Electron Microscopy. Version 2.0

摘要

The analysis of asbestos by transmission electron microscopy is important for determination of the cleanliness of air or water and for research purposes. Verified analysis provides a method for determining the quality of the analyses. Verified analysis is a procedure in which a grid opening is independently analyzed for asbestos by two or more transmission electron microscope (TEM) operators and in which a comparison and evaluation of the correctness of the analyses are made by a verifying analyst. Detailed information - including absolute or relative location, a sketch, orientation, sized (length, width), morphology, analytical information and structure identification - is recorded for each observed asbestos structure. Comparisons of the analyses are made on a structure-by-structure basis and the percentage of true positives, false positives and false negatives are determined for each TEM operator. Verified analyses can be used as part of a quality assurance program for asbestos analyses and as a training procedure. This report describes a method for conducting a verified analysis. The method is reported in ASTM format. This version contains a revised procedure, examples and flow charts.