Chronological Classification of Ancient Mortars Employing Spectroscopy and Spectrometry Techniques: Sagunto (Valencia, Spain) Case

Table 2

Accuracy of pED-XRF analysis evaluated through the use of CRM (soil NIM GBW07408 and limestone NCS DC60108a) reference samples. As regards NCS DC60108a, not detected Ti concentration and uncertainty of Al₂O₃ determination in the limestone sample are related to the sensitivity of the spectrometer.

Element	NIM GBW07408		NCS DC60108a
	Certified	Measured	Certified	Measured
Al2O3	11.92 ± 0.15	12.06 ± 0.81	0.33 ± 0.03	0.61 ± 0.19
SiO2	58.61 ± 0.13	52.87 ± 3.71	2.09 ± 0.06	2.76 ± 0.05
CaO	8.27 ± 0.12	8.60 ± 0.28	51.61 ± 0.15	50.31 ± 3.15
Ti	0.38 ± 0.01	0.37 ± 0.01	0.009 ± 0.001	N/D
Fe	3.13 ± 0.03	3.27 ± 0.09	0.12 ± 0.02	0.15 ± 0.01

Note. Certified and measured values of the analyzed elements. The values are expressed as weight percentages (wt.%). N/D: not detected.