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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Characterisation of an unusual efflorescence salt on Egyptian limestone relief

Gibson, Lorraine and Littlejohn, David (1997) Characterisation of an unusual efflorescence salt on Egyptian limestone relief. Analytica Chimica Acta, 337 (2). pp. 151-164. ISSN 0003-2670

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Abstract

Fibrous crystals, up to 2 cm long and 3 μm in diameter, have been observed on an Egyptian limestone relief, stored in a wooden cabinet at the Burrell Collection, Glasgow. X-ray diffraction and infrared spectroscopy have shown that the crystals are identical to an uncharacterised efflorescence first reported in 1971. Ion chromatography was used in conjunction with scanning electron microscopy, x-ray spectrometry, and thermogravimetry to determine the composition of the salt efflorescence. The salt comprises, primarily, calcium, acetate, chloride and nitrate ions. Proton nuclear magnetic resonance spectrometry at 400 MHz was used to establish the degree of hydration. The stoichiometric formula derived from the analyses is Ca3(CH3COO)3Cl(NO3)2· 7H2O. This is a new crystalline salt not previously characterised.