Characterization of Mineral and Synthetic Vitreous Fibers with Digital Stereo Microscopy
Keywords:MOD, SEM, Inductively Coupled Plasma Optical Emission, Man Made Vitreous Fibers, Man Made Mineral Fibers
AbstractThe measurement and the characterization of the Vitreous Artificial Fibers (FAV) is taking strong attention in recent years due to the fact that they are, to date, the most frequent alternative to asbestos fibers.
The legislation provides for a chemical and morphological characterization of the fibers. The latter is carried out by means of electron microscopy, a technique that is characterized on the one hand by its high accuracy in morphological characterization but on the other by the high times and unit costs of the analysis.
In the last years microscopic investigation techniques have had a notable impulse through the use of Digital Optical Microscopy (MOD) which has allowed to obtain increasingly accurate and detailed images and a depth of field, comparable to Scanning Electron Microscopy (SEM) .
The present study reports the results obtained on FAV present in bulk samples, correlating MOD and SEM for 10 different real fibrous materials, examined first in MOD, a technique requiring a very simple sample preparation, and then in SEM after metallization. With each technique, 300 fields were examined for each sample and the correlation values obtained (ranging from 0.965 to 0.997) furthermore, the statistical tests carried out are in support of the equivalence of the two analytical approaches.
The MOD is therefore presented as an instrumental alternative cheaper, practical and versatile than SEM, also in light of the possibility of chemically characterizing the elemental composition of the total fibers taken on the filter in a given exhibition scenario, being able to provide complementary indications to the count of fibers, obtainable after filter mineralization and subsequent elemental both in trace and ultra-trace analysis.
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