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New approach to the differentiation of marble samples using thermal analysis and chemometrics in order to identify provenance.

Gatta T, Gregori E, Marini F, Tomassetti M, Visco G, Campanella L - Chem Cent J (2014)

Bottom Line: The main data thus obtained after subsequent chemometric evaluation (using Principal Components Analysis) have already proved useful in the identification the original quarry of a small number of archaeological marble finds.One of the most evident advantages of the thermoanalytical - chemometric approach adopted seems to be that it allows the certain identification of an unknown find composed of a marble known to be present among the reference samples considered, that is, contained in the reference file.On the other hand with equal certainty it prevents the occurrence of erroneous or highly uncertain identification if the find being tested does not belong to the reference file considered.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry, University of Rome "La Sapienza", P.le. Aldo Moro 5, I-00185 Rome, Italy.

ABSTRACT

Background: The possibility of applying a novel chemometric approach which could allow the differentiation of marble samples, all from different quarries located in the Mediterranean basin and frequently used in ancient times for artistic purposes, was investigated. By suggesting tentative or allowing to rule out unlikely attributions, this kind of differentiation could, indeed, be of valuable support to restorers and other professionals in the field of cultural heritage. EXPERIMENTAL DATA WERE OBTAINED ONLY USING THERMAL ANALYTICAL TECHNIQUES: Thermogravimetry (TG), Derivative Thermogravimetry (DTG) and Differential Thermal Analysis (DTA).

Results: The extraction of kinetic parameters from the curves obtained using these thermal analytical techniques allowed Activation Energy values to be evaluated together with the logarithm of the Arrhenius pre-exponential factor of the main TG-DTG process. The main data thus obtained after subsequent chemometric evaluation (using Principal Components Analysis) have already proved useful in the identification the original quarry of a small number of archaeological marble finds.

Conclusion: One of the most evident advantages of the thermoanalytical - chemometric approach adopted seems to be that it allows the certain identification of an unknown find composed of a marble known to be present among the reference samples considered, that is, contained in the reference file. On the other hand with equal certainty it prevents the occurrence of erroneous or highly uncertain identification if the find being tested does not belong to the reference file considered.

No MeSH data available.


TG, DTG and DTA curves recorded on the 4 unknown marble samples and those referring to the ‘tempio rotondo’, namely the sample selected as ‘test sample’. The numbers and marks used to identify the samples in these figures are the same as those used in Table 1, to which reference is made. TG/DTG curves were recorded in the interval 35-1000°C, while DTA curves in the interval 35-1200°C.
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Figure 1: TG, DTG and DTA curves recorded on the 4 unknown marble samples and those referring to the ‘tempio rotondo’, namely the sample selected as ‘test sample’. The numbers and marks used to identify the samples in these figures are the same as those used in Table 1, to which reference is made. TG/DTG curves were recorded in the interval 35-1000°C, while DTA curves in the interval 35-1200°C.

Mentions: All the TG, DTG e DTA curves of all the carefully ground up marble samples tested were recorded under the experimental conditions described in the “Methods” section. Additional file 1: Figure S1 in the supplementary material contains the TG, DTG and DTA curves of the 16 “standard reference marble” samples, while Figure 1 shows the experimental thermal analytical profiles recorded on the 4 unknown marble samples (numbers 18 to 21) and on the “Tempio Rotondo” (identified as number 17) [1].


New approach to the differentiation of marble samples using thermal analysis and chemometrics in order to identify provenance.

Gatta T, Gregori E, Marini F, Tomassetti M, Visco G, Campanella L - Chem Cent J (2014)

TG, DTG and DTA curves recorded on the 4 unknown marble samples and those referring to the ‘tempio rotondo’, namely the sample selected as ‘test sample’. The numbers and marks used to identify the samples in these figures are the same as those used in Table 1, to which reference is made. TG/DTG curves were recorded in the interval 35-1000°C, while DTA curves in the interval 35-1200°C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4061118&req=5

Figure 1: TG, DTG and DTA curves recorded on the 4 unknown marble samples and those referring to the ‘tempio rotondo’, namely the sample selected as ‘test sample’. The numbers and marks used to identify the samples in these figures are the same as those used in Table 1, to which reference is made. TG/DTG curves were recorded in the interval 35-1000°C, while DTA curves in the interval 35-1200°C.
Mentions: All the TG, DTG e DTA curves of all the carefully ground up marble samples tested were recorded under the experimental conditions described in the “Methods” section. Additional file 1: Figure S1 in the supplementary material contains the TG, DTG and DTA curves of the 16 “standard reference marble” samples, while Figure 1 shows the experimental thermal analytical profiles recorded on the 4 unknown marble samples (numbers 18 to 21) and on the “Tempio Rotondo” (identified as number 17) [1].

Bottom Line: The main data thus obtained after subsequent chemometric evaluation (using Principal Components Analysis) have already proved useful in the identification the original quarry of a small number of archaeological marble finds.One of the most evident advantages of the thermoanalytical - chemometric approach adopted seems to be that it allows the certain identification of an unknown find composed of a marble known to be present among the reference samples considered, that is, contained in the reference file.On the other hand with equal certainty it prevents the occurrence of erroneous or highly uncertain identification if the find being tested does not belong to the reference file considered.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry, University of Rome "La Sapienza", P.le. Aldo Moro 5, I-00185 Rome, Italy.

ABSTRACT

Background: The possibility of applying a novel chemometric approach which could allow the differentiation of marble samples, all from different quarries located in the Mediterranean basin and frequently used in ancient times for artistic purposes, was investigated. By suggesting tentative or allowing to rule out unlikely attributions, this kind of differentiation could, indeed, be of valuable support to restorers and other professionals in the field of cultural heritage. EXPERIMENTAL DATA WERE OBTAINED ONLY USING THERMAL ANALYTICAL TECHNIQUES: Thermogravimetry (TG), Derivative Thermogravimetry (DTG) and Differential Thermal Analysis (DTA).

Results: The extraction of kinetic parameters from the curves obtained using these thermal analytical techniques allowed Activation Energy values to be evaluated together with the logarithm of the Arrhenius pre-exponential factor of the main TG-DTG process. The main data thus obtained after subsequent chemometric evaluation (using Principal Components Analysis) have already proved useful in the identification the original quarry of a small number of archaeological marble finds.

Conclusion: One of the most evident advantages of the thermoanalytical - chemometric approach adopted seems to be that it allows the certain identification of an unknown find composed of a marble known to be present among the reference samples considered, that is, contained in the reference file. On the other hand with equal certainty it prevents the occurrence of erroneous or highly uncertain identification if the find being tested does not belong to the reference file considered.

No MeSH data available.