Influence of Process Parameters on Chlorinated Biocide Decontamination by li-CO2 on Artificially Contaminated Model Materials |
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| Authors: | Tiziana Lombardo Marie Wörle Vera Hubert Erwin Hildbrand Christina Hinterleitner Ingo Mayer |
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| Institution: | 1. Collection Center, Swiss National Museum, Affoltern am Albis, Switzerlandtiziana.lombardo@nationalmuseum.ch https://orcid.org/0000-0002-7941-0576;3. Collection Center, Swiss National Museum, Affoltern am Albis, Switzerland;4. Institute of Materials and Wood Technology, Bern University of Applied Sciences, Biel, Switzerlandhttps://orcid.org/0000-0003-2056-7488;5. Institute of Materials and Wood Technology, Bern University of Applied Sciences, Biel, Switzerland |
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| Abstract: | ABSTRACTPreviously, heavy use of biocides for the treatment of objects made of organic materials in museum collections (e.g. ethnographic, historical collections) was very common. Now suitable decontamination methods/technologies are being sought. A decontamination treatment by li-CO2 was optimized that considered the specific requirements of museum objects. The treatment was tested on model materials artificially contaminated with biocide solutions containing dichlorodiphenyltrichloroethane (DDT), pentachlorophenol (PCP), lindane, and permethrin or cypermethrin. High decontamination was achieved for DDT, lindane, PCP, and permethrin on artificially biocide loaded wool and wood model materials. Optimal process parameter settings for li-CO2 decontamination include a single 30?min cycle for woolen materials and three sequential 30?min cycles each for wood. These methods allow a reduction of at least 90% of all biocides for wool and between 70% and 85% for wood. Decontamination of the latter was more effective for less polar biocides as DDT and permethrin. Despite a significant improvement in decontamination for wood using co-solvents such as acetone, ethanol, and methyl tertiary-butyl ether (MTBE), their use is not recommended due to the increased risk of damage to the objects, in particular if a surface coating is present. |
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| Keywords: | Biocide contamination museum collections liquid CO2 decontamination model materials |
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![ORCID Icon]({"type":"image","src":"/templates/jsp/images/orcid.png"} "ORCID Icon")
https://orcid.org/0000-0002-7941-0576;3. Collection Center, Swiss National Museum, Affoltern am Albis, Switzerland;4. Institute of Materials and Wood Technology, Bern University of Applied Sciences, Biel, Switzerland