Academic thesis
| Susanne Domke: | Back | |
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| Abstract: | This Master-Thesis is concerned with the degradation of dichlorodiphenyltrichloroethane (DDT) in wooden objects by atmospheric nitrogen plasma. The aim is to determine the decontamination po-tential of the atmospheric pressure plasma technology and to assess its suitability in conservation as a partially applied decontamination method. The background for the investigation is the problem of DDT-contaminated wooden objects, whose preservation is associated with health risks. The search for object-compatible decontamination methods has already led to many solutions which are further developed primarily by restorers. This work summarises current tendencies in decontamination research. Noninvasive and mobile mehods offer advantages in the decontamination of sensitive or permanently installed objects, whereas the atmospheric pressure plasma technology promises a non-contact DDT-decrease of contaminates wood surfaces. Its potential for decontamination and its suitability for applications in the conservation of wooden surfaces is examined in this thesis. For this purpose, the active substance DDT and its use in wood preservation is characterised and discussed. Systematic test-se ries on wood specimens with two nitrogen-operated plasma-systems form the experimental focus of this thesis. The decrease in DDT is determined by X-ray fluorescence analysis. Stereo and scanning electron microscopy as well as exemplary pH-measurements support the investi- gation of surface changes. The experiments conform the near-surface decrease of DDT by non-thermal atmospheric nitrogen plasma. As a result, however, it should be noted that the surface temperature has significant impact on the amount on DDT decrease. The required surface temper- atures and the chemical changes of the woood surface are being critically evaluated, as are the safety measures and the practical application. As a result, atmospheric nitrogen plasma can, with the systems tested in this thesis, only with limitations be recommended for applications on wooden cultural heritage. |
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