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Principal Component Analysis of Near-Infrared Spectra of Alteration Products in Calcareous Samples

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Abstract:

Principal component analysis (PCA) of diffuse reflectance near-infrared (NIR) spectra has been used as a suitable methodology for discriminating areas involved in the sulfation process of calcareous stones. NIR spectra of standard mixtures containing CaSO4.2H2O, CaSO3.1/2H2O, and CaCO3 were recorded. For all data sets sub- mitted to PCA, a good discrimination between the two reaction products, i.e., CaSO3.1/2H2O and CaSO4.2H2O, in the alteration process was obtained. The actual availability of fiber-optic spectrum analyzers working in the NIR region suggests that the proposed procedure can be used as a safe and nondestructive method for monitoring alteration processes in calcareous works of art.

Keywords: CHEMOMETRICS PRINCIPAL COMPONENT ANALYSIS; FACTOR ANALYSIS NEAR-INFRARED REFLECTANCE SPECTROSCOPY SULFATION OF CALCAREOUS STONES

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702971940846

Publication date: May 1, 1997

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