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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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