Table 1 Comparison of experimental and certified values for SRM 1646a and 97b
From: XRF elemental analysis of inks in South American manuscripts from 1779 to 1825
Element | Experimental value | Certified value | Relative error \(\frac{{{X_{Exp}} - {X_{Certif}}}}{{{X_{Certif}}}} \times 100\) | ||
|---|---|---|---|---|---|
SRM 1646a | |||||
[] ppm | % SD | [] ppm | %SD | ||
Fe | 15,763 ± 69 | 0.44 | 20,080 ± 390 | 1.94 | − 21 |
S | 4138 ± 137 | 3.30 | 3520 ± 40 | 1.14 | 18 |
Cu | 12.3 ± 1.60 | 13.01 | 10.01 ± 0.34 | 3.40 | 23 |
Zn | 38.7 ± 1.4 | 3.62 | 48.9 ± 1.6 | 3.27 | − 21 |
Mn | 173 ± 3 | 1.73 | 235 ± 3 | 1.19 | − 26 |
Pb | 9.50 ± 0.90 | 9.47 | 11.7 ± 1.2 | 10.26 | − 19 |
As | 7.7 ± 0.80 | 10.39 | 6.23 ± 0.21 | 3.37 | 24 |
K | 8043 ± 62 | 0.77 | 8640 ± 167 | 1.85 | − 7 |
Ca | 3886 ± 39 | 1.02 | 5190 ± 200 | 3.85 | − 26 |
Ti | 4041 ± 26 | 0.64 | 4560 ± 210 | 4.61 | − 11 |
SRM 97b | |||||
Fe | 6223 ± 31 | 0.50 | 8310 ± 80 | 0.96 | − 25 |
Mn | 39 ± 2 | 5.13 | 47 ± 5 | 10.64 | − 17 |
Sr | 83.4 ± 1.5 | 1.80 | 84 ± 2 | 2.38 | − 0.7 |