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Author
Luco Colilles, Arnau
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Abstract
The Conservation of Assets of Cultural Interest is an area that is gaining relevance in all the museums of the world since it allows to control the deterioration of these Assets reducing the risk of the damages that they may suffer. For good preventive conservation, it is very important to control the exposure suffered by Cultural Assets to different pollutants, including VOCs. Within the group of VOCs, those who have the most negative effect are those that have acidic properties, such as organic acids. But not only these must be controlled since the presence of those precursor substances of these acids must also be known. And in this group are aldehydes and halogenated compounds, which with prolonged exposure to normal air and humidity conditions can produce organic and inorganic acids respectively.
This Master's Final Project is the continuation of the research project carried out during the academic year 2019-2020 between the Department of Restoration and Preventive Conservation of the National Museum of Art of Catalonia (MNAC) and the Chromatography Section of the Department of Analytical Chemistry and Applied from the Chemical Institute of Sarrià (IQS). In this project we want to identify the Volatile Organic Compounds (VOCs) present in 3 different spaces of the MNAC, to quantify the aldehydes and ketones in these spaces. Due to the identification of VOCs in the agreed spaces, they are retained in passive collectors with activated carbon acting as an adsorbent. The sampling phase goes from 7 days to 33 days. The adsorbed compounds are desorbed with dimethylacetamide (DMA) and the extract is analyzed using the HS-GC-MS technique, following the method already optimized in the previous work. For the quantification of aldehydes and ketones, the analytes are captured in passive samplers, placed in the air for 7 days. The adsorbent material for the samplers is a porous paper coated with dinitrophenylhydrazine (DNPH), allowing selective and quantitative sampling of the analytes of interest. The analytes are desorbed with acetonitrile and the extract is analyzed using the HPLC-DAD technique. Detected unidentified peaks are subsequently analyzed with UPLC-MS / QTOF.
The analyzes for the determination of VOCs in the spaces have allowed the identification of 31 different compounds among the three sampled spaces. The quantification of aldehydes and ketones has made it possible to quantify, above 0.5 ppb, up to 7 different analytes. The results obtained from the concentration of aldehydes in the air will be compared with the values proposed by The Getty Conservation Institute to classify the air quality in spaces for the storage of Cultural Heritage Assets.
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