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Noninvasive monitoring of moisture uptake in Ca(NO 3 ) 2 ‐polluted calcareous stones by 1 H‐NMR relaxometry
Author(s) -
Casieri Cinzia,
Terenzi Camilla,
De Luca Francesco
Publication year - 2015
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4173
Subject(s) - chemistry , calcareous , relaxometry , moisture , relative humidity , adsorption , relaxation (psychology) , pollutant , environmental chemistry , porosity , pollution , analytical chemistry (journal) , mineralogy , organic chemistry , thermodynamics , geology , medicine , psychology , paleontology , social psychology , ecology , physics , spin echo , biology , magnetic resonance imaging , radiology
NMR transverse relaxation time ( T 2 ) distribution of 1 H nuclei of water has been used to monitor the moisture condensation kinetics in Ca(NO 3 ) 2 · 4H 2 O‐polluted Lecce stone, a calcareous stone with highly regular porous structure often utilized as basic material in Baroque buildings. Polluted samples have been exposed to water vapor adsorption at controlled relative humidity to mimic environmental conditions. In presence of pollutants, the T 2 distributions of water in stone exhibit a range of relaxation time values and amplitudes not observed in the unpolluted case. These characteristics could be exploited for in situ noninvasive detection of salt pollution in Lecce stone or as damage precursors in architectural buildings of cultural heritage interest. Copyright © 2014 John Wiley & Sons, Ltd.