Validation Study of Selected Ion Flow Tube-Mass Spectrometry (SIFT-MS) in Heritage Science: Characterization of Natural and Synthetic Paint Varnishes by Portable Mass Spectrometry
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The identification at molecular level of organic materials in heritage objects as paintings requires in most cases the collection of micro-samples followed by micro-destructive analysis. In this study, we explore the possibility to characterize natural and synthetic resins used as paint varnishes by mean of non-invasive analysis of released volatile organic compounds (VOCs) through selected ion flow tube-mass spectrometry (SIFT-MS). SIFT-MS is a portable direct mass spectrometric technique that achieves the analysis of VOCs at trace levels in real time, by controlled ultra-soft chemical ionization using eight different chemical ionization agents. We tested the portable instrumentation on different reference resins used as paint varnishes, both natural (mastic, dammar, and colophony) and synthetic (Paraloid B67, MS2A, Regalrez 1094, and polyvinyl acetate), to evaluate the possibility to acquire qualitative data for the identification of these materials in heritage objects avoiding any sampling. This new analytical approach was validated by comparison with the traditional approach for VOCs analysis based on solid phase micro extraction-gas chromatography/mass spectrometry (SPME-GC/MS) analysis. The results demonstrate the use of SIFT-MS as an in situ non-invasive and non-destructive mass spectrometric technique to identify organic materials, such as paint varnishes.
KeywordsMass spectrometry Natural resins Synthetic resins SPME-GC/MS SIFT-MS VOCs
Financial support from Regione Toscana and SRA Instruments S.p.A (POR-FSE 2014-2020, MS-MOMus project: “Spettrometria di Massa SIFT portatile e identificazione di Materiali Organici in ambiente Museale”) are fully acknowledged. The authors wish to thank the students Fabiana Cordella and Adele Ferretti for their help with the experiments, and express gratitude to Dott. Andrea Carretta and Dott. Armando Miliazza (SRA Instruments S.p.A.) for their valuable advice on SIFT technology and applications.
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