WDXRF analysis of Iberian potsherds from the Late Iron Age
The outer surfaces of all the samples were mechanically removed prior to analysis.
The samples were heated to 950°C for one hour after 24h drying at 50°C, weighted for LOI calculation and ground in a tungsten carbide mortar. 0.8 g of powder was mixed with 3.2 g of Spectroflux 110 flux (Johnson Matthey; 33.5% metaborate and 66.5 % lithium tetraborate) and melted in gold-platinum crucibles with an autofluxer melting device (Breitländer).
The data were collected with a SRS 3400 (Bruker) spectrometer of 3 kW power (working at 60 kV, 100 mA max.). The spectrometer was equipped with a rhodium tube window, four analyser crystals (OVO-55, LiF200, LiF220, PET), two collimators (0.46° and 0.15°) and two sensors (a proportional Ar/CH4 gas-flow counter and a scintillation counter). The calibration of the instrument was carried out on 40 international certified reference materials.
- sample: sample reference;
- date: date of the analysis;
- laboratory: analysis laboratory;
- stratigraphy: stratigraphic unit (all dated to the first half of the 1st century BC);
- artefact: typology;
- part: analysed part of the artefact;
- LOI: loss on ignition (percent);
- CaO, Fe2O3, TiO2, K2O, SiO2, Al2O3, MgO, MnO, Na2O, P2O5: oxide mass percents;
- Zr, Sr, Rb, Zn, Cr, Ni, La, Ba, V, Ce, Y, Th, Pb, Cu: ppm.
Data below the following limits should be considered unreliable:
- Na2O: 0.5 %
- La: 24 ppm
- Y: 15 ppm
- Th: 15 ppm
- Pb: 20 ppm
- Cu: 10 ppm