<報文>都市大気及び飲料中の石綿繊維の計測

概要

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The relatively recent discovery of asbestos fibers in urban air and some beverages has given rise to concern about the possible health hazards. A membrane filter method which is the present technique of optically counting asbestos fibers may not identify the asbestos, especially the chrysotile. A simple modified membrane filter method was found by the use of acetophenone as an alternative mounting solution, and the optical microscope observation of both fields in the eye-plece with and without a phase contrast turret condenser. As an example of the concentration of asbestos fibers in urban air, the counting of chrysotile fibers at three traffic sites in Yokohama was conducted (0.002-0.028 fibers/㎤). Moreover, the determination of crysotile fibers in such beverages as Japanese sake, beer, wine and drinking water, and 50% caustic soda (diaphragm cell) was carried out and compared with that by means of the electron microscope. As the results, the modified membrane filter method may considerably underestimate the concentration of chrysotile, but seems to be available for the simple and rapid method.
横浜国立大学の論文