Table T1. Accuracy of standard reference material NIST-1c in shore-based (flux and microwave-assisted digested) measurements.
Element
Published
value
Measured
value (N = 6)
Major element oxide (wt%):
SiO2 6.84 0.08 6.78 0.24
Al2O3 1.30 0.03 1.28 0.02
TiO2 0.070 0.010 0.069 0.002
Fe2O3 0.55 0.03 0.56 0.02
MnO 0.025 0.005 0.021 0.001
CaO 50.3 0.3 50.4 1.0
MgO 0.42 0.04 0.39 0.01
Na2O 0.020 0.010 0.020 0.001
K2O 0.28 0.01 0.29 0.01
P2O5 0.04 0.01 0.038 0.001
Trace element (ppm):
Ba NR 56.3 1.5
Sr 254 42 257 8
Cr NR 11.7 0.3
Ni NR 8.91 0.45
Sc NR 1.47 0.04
V NR 10.4 0.4
Zr NR 35.1 1.4

Notes: Error reported as 1. NR = not reported.