Abstract
Some analytical techniques are able to produce images, making if possible to obtain a large amount of information. Working with images, the pixels can be treated like objects in a data matrix. In this way, a multi-way PCA of micrograph images was applied to the internal surface of a Teflon coil used for microwave sample digestion. This Teflon coil was used for 120 h and had been attacked with different acids. It was cut into 3 pieces (namely: initial, medium and central portions) in order to obtain 7 micrographs (2 for initial, 2 for medium and 3 for the central part). A micrograph of a piece from a new Teflon coil was used for comparison. With these 8 micrographs, it was possible to establish a three-dimensional arrangement. After multi-way PCA was applied to the Teflon surface images, was possible to group a great amount of information and to characterise different parts of this coil.
Published Version
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