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Table 2 Precision and accuracy of the INAA measurements

From: Mediterranean and Near East obsidian reference samples to establish artefacts provenance

Element USGS GRX-4 USGS G-2
  Found Certified Z-score    Z-score
As 104 ± 4 (3.8) 98 ± 10 −1,5 - -  
Ba   1350 ± 330   1865 ± 19 1880 ± 23 1,6
Ce 69 ± 7 114 ± 8 6,4 147.7 ± 9.8 160 ± 10 1,3
Co 12.4 ± 0.7 (5.6) 16 ± 2 5,1 4.35 ± 0.29 4.6 ± 0.7 0,9
Cr 64 ± 14 (21.9) 64 ± 10 0,0 9.81 ± 0.51 -  
Cs 2.8 ± 0.1 (3.6) 3 ± 1 2,0 1.55 ± 0.28 1.34 ± 0.16 −0,8
Eu 1.4 ± 0.2 (14.3) 1.6 ± 0.1 1,0 1.41 ± 0.05 1.40 ± 0.12 −0,2
Fe (%) 3.02 ± 0.02 (0.7) 2.97 ± 0.43 −2,5 - -  
Hf   8.0 ± 0.5   8.27 ± 0.61 7.9 ± 0.7 −0,6
K (%) 4.2 ± 0.1 (2.4) 4.3 ± 0.6 1,0 - -  
La 65 ± 12 (18.5) 64 ± 5 −0,1 85.2 ± 5.3 89 ± 8 1,2
Na 5080 ± 42 (0.8) 5300 ± 300 5,2 - -  
Nd - -   57.3 ± 2.8 55 ± 6 −0,8
Ni 40.2 ± 1.0 (2.5) 38 ± 4 −2,2 - -  
Rb 166 ± 7 (4.2) 174 ± 7 1,1 165 ± 7 170 ± 3 0,7
Sb 5.2 ± 0.2 (3.8) 4.4 ± 0.8 −4,0 - -  
Sc   8.3 ± 0.4   3.7 ± 0.3 3.5 ± 0.4 −0,7
Se 8.2 ± 0.2 (2.4) 6.0 ± 0.5 −11,0 - (0.07)  
Sm 6.3 ± 0.1 (1.6) 6 ± 1 −3,0 7.14 ± 0.24 7.2 ± 0.7 0,3
Sr   220 ± 30   503 ± 32 478 ± 2 −0,8
Ta - 0.77 ± 0.07   0.974 ± 0.091 (0.5) −5,2
Th 21.1 ± 5.9 22 ± 2 0,2 25.0 ± 1.4 25 ± 2 0,0
U 6.13 ± 2.82 6.42 ± 0.25 0,1 - -  
Yb 1.9 ± 0.2 (10.5) 1.8 ± 0.1 −0,5 0.935 ± 0.126 0.8 ± 0.2 −1,1
Zn 60 ± 9 (15.0) 64 ± 10 0,4 95 ± 11 86 ± 8 −0,8
Zr   200 ± 40 −1,5 289 ± 22 309 ± 35 0,9
  1. Analytical comparison (mean ± s.d.; μg g−1, except% for Fe and K) of USGS GRX-4 standard. In brackets are reported the coefficients of variation, CVs (%), calculated as ratio between standard deviation and mean value × 100.