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Thermogravimetric and kinetic methods to date wood finds. First results

Annali di Chimica, ISSN: 0003-4592, Vol: 93, Issue: 11, Page: 897-907
2003
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Conference Paper Description

Fresh (larch and fir, in its white and red varieties) and ancient wood samples (dating respectively to the 13, 15 and 17 centuries) were subjected to thermogravimetric analysis (TG and DTG). The resulting thermogravimetric data were then used to construct archeometric curves for the wood varieties tested. In a preliminary approach, it was attempted to correlate the onset temperature of the thermogravimetric step corresponding to cellulose decomposition with the age (expressed in centuries) of the samples, although the results obtained were anything but brilliant. More encouraging results were obtained by examining the relationship between wood sample age and the value of the (percent cellulose/percent lignin) ratio computed from the thermogravimetric data. Lastly, a procedure for processing data obtained from the TG curves was applied to a kinetic analysis of the processes that take place when wood samples are subjected to a temperature regime with a constant heating rate, obtaining values for the activation energy of the TG step corresponding to the decomposition of cellulose. Also using these data it was attempted to construct archeometric curves, obtaining results that varied quite significantly according to the wood species tested.

Bibliographic Details

Campanella, Luigi; Favero, Gabriele; Rodante, Fabrizio; Tomassetti, Mauro; Vecchio, Stefano

Chemistry; Environmental Science

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