By C. Wayne Smith
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Additional resources for Archaeological Conservation Using Polymers: Practical Applications for Organic Artifact Stabilization (Texas A&M University Anthropology Series)
Electron ionization mass spectrographic analysis was performed on the outgases from waterlogged archaeological wood. ) mass spectra of the out-gases from the ﬁve waterlogged wood samples were acquired on a VG Analytical S high-resolution, double-focusing magnetic sector mass spectrometer. The VG S was equipped with a VG /J data system that allowed computer control of the instrument, data recording, and data processing. I. source was maintained at ˚C during the analyses, while eV positive analyte ions were extracted and accelerated to keV and then mass analyzed.
Thus this process may have a higher potential for exchanging silicone oils, or other bulking agents, into waterlogged materials. , which may suggest that, from the standpoint of the removal of free water from waterlogged wood, all processes were relatively equal. Diﬀerences in bulking potentials, then, lie in the heightened levels of volatile gases that result in cold process, vacuum assisted alcohol-acetone dehydration. includes the out-gassing data for all ﬁve samples. The data suggest that the rise in molecular acetone and methyl levels resulting from multiple-solvent dehydration makes two-stage cold dehydration potentially more appropriate for silicone bulking.
Bottom). The spectral diﬀerence for the waterlogged tongue depressor treated with PEG shows up in the 13C Bloch decay spectrum (ﬁg. , top). ppm observed in the 13C solution state spectrum for an aqueous solution of PEG and with the broader 13C resonance at ppm for PEG in the solid state. The absence of signal or small signal intensity observed under cross-polarization is consistent with signiﬁcant molecular mobility of the PEG . Such mobility would attenuate or average the 1H-13C dipolar interaction used for magnetization transfer in the experiment.