Table T4. Detection limits, procedural blank, and estimates of accuracy and precision for major and trace element ICP–AES analyses, Expedition 335. (Continued on next page.)
Sample
|
Detection limit |
Procedural blank |
BAS-140 | JB-1A | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Run 1
|
Run 2
|
Average
|
Preferred value |
Precision (%) |
Accuracy (%) |
Run 1
|
Run 2
|
Average
|
Preferred value |
Precision (%) |
Accuracy (%) |
|||
Major element oxide (wt%): | ||||||||||||||
SiO2 | 0.34 | BDL | 50.69 | 51.02 | 50.85 | 50.58 | 0.45 | 0.55 | 53.74 | 54.18 | 53.96 | 52.89 | 0.58 | 2.02 |
TiO2 | 0.03 | BDL | 1.03 | 0.99 | 1.01 | 0.98 | 2.98 | 2.65 | 1.31 | 1.29 | 1.30 | 1.32 | 1.44 | –1.38 |
Al2O3 | 0.14 | BDL | 14.79 | 14.46 | 14.63 | 14.62 | 1.60 | 0.03 | 15.14 | 14.73 | 14.93 | 14.71 | 1.93 | 1.50 |
Fe2O3T | 0.28 | BDL | 11.33 | 11.25 | 11.29 | 11.12 | 0.56 | 1.56 | 9.15 | 9.17 | 9.16 | 9.23 | 0.15 | –0.75 |
MgO | 0.30 | BDL | 8.38 | 8.20 | 8.29 | 8.16 | 1.58 | 1.56 | 8.13 | 7.96 | 8.05 | 7.86 | 1.43 | 2.38 |
MnO | 0.01 | 0.10 | 0.19 | 0.19 | 0.19 | 0.19 | 1.47 | –1.30 | 0.15 | 0.15 | 0.15 | 0.15 | 0.28 | –1.50 |
CaO | 0.16 | BDL | 12.55 | 12.43 | 12.49 | 12.42 | 0.67 | 0.54 | 9.64 | 9.47 | 9.55 | 9.36 | 1.26 | 2.05 |
Na2O | 0.06 | 0.09 | 1.81 | 1.74 | 1.78 | 1.84 | 2.59 | –3.61 | 2.96 | 2.94 | 2.95 | 2.78 | 0.70 | 6.18 |
K2O | 0.01 | BDL | 0.01 | BDL | 0.01 | 0.01 | 1.61 | 2.65 | 1.44 | 1.41 | 1.42 | 1.44 | 1.44 | –1.19 |
P2O5 | 0.05 | 0.07 | 0.08 | ND | 0.08 | 0.08 | 27.68 | 3.23 | 0.26 | ND | 0.26 | 0.26 | 27.68 | –1.46 |
Totals:
|
100.86 | 100.26 | 100.61 | 100.00 | 0.61 | 101.91 | 101.29 | 101.73 | 100.00 | |||||
Trace element (ppm): | ||||||||||||||
Sc | 1.37 | BDL | 59 | 45 | 52 | 43 | 18.62 | 20.25 | 29 | 28 | 28 | 29 | 0.14 | –1.82 |
V | 16.49 | 49.71 | 360 | 355 | 357 | 333 | 0.96 | 7.34 | 216 | 217 | 217 | 220 | 0.35 | –1.57 |
Cr | 12.37 | 15.64 | 186 | 188 | 187 | 186 | 0.91 | 0.46 | 425 | 397 | 411 | 415 | 4.83 | –0.87 |
Co | 6.46 | BDL | NA | 53 | 53 | 55 | 3.78 | –2.77 | NA | 42 | 42 | 39.5 | 2.42 | 6.12 |
Ni | 27.17 | BDL | 89 | 106 | 98 | 85 | 12.26 | 15.15 | 148 | 144 | 146 | 140 | 1.78 | 4.49 |
Cu | 8.29 | BDL | 81 | 77 | 79 | 81 | 4.05 | –2.22 | 57 | 58 | 57 | 55.5 | 1.50 | 3.27 |
Zn | 1.99 | 2.16 | 49 | ND | 49 | 80 | 1.45 | –38.14 | 107 | ND | 107 | 82 | 1.45 | 30.02 |
Sr | 2.62 | 13.83 | 47 | 41 | 44 | 44 | 8.25 | 0.03 | 444 | 473 | 458 | 443 | 4.42 | 3.44 |
Y | 3.72 | 1.72 | 31 | 28 | 30 | 24 | 6.77 | 24.26 | 25 | 23 | 24 | 25 | 4.48 | –4.93 |
Zr | 3.13 | BDL | 43 | 51 | 47 | 49 | 13.16 | –4.31 | 144 | 132 | 138 | 144 | 6.25 | –4.12 |
Ba | 2.07 | 7.42 | BDL | ND | 2 | 509 | 499 | 504 | 497 | 1.41 | 1.35 |
Precision (or reproducibility) is the standard deviation of the mean of run-to-run analyses. Accuracy is the difference from preferred standard values (Preferred values) to compiled values of the standard materials recalculated on a volatile-free basis. Compiled values are from Govindaraju (1994) for MRG-1 and JB-1A and from Sparks and Zuleger (1995) for BAS-140. Fe2O3T = all Fe as Fe2O3. BDL = below detection limit, ND = not detected, NA = not applicable.
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