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Table 4 Descriptive statistics of elements contents (weight%) in KACST404 CRM

From: Between-bottle homogeneity test of new certified reference materials employing wavelength dispersive X-ray fluorescence spectrometry

Element Average SD RSD% RAD% Skewness Kurtosis
Al 1.780 0.0082 0.46 0.32 0.00 − 1.20
Ca 24.76 0.1134 0.46 0.38 0.24 − 1.23
Cl 0.368 0.0020 0.55 0.48 0.13 − 1.96
Cr 0.034 0.0006 1.86 1.52 0.08 − 1.77
Cu 0.021 0.0010 4.78 4.27 − 0.45 − 2.32
Fe 2.467 0.0325 1.32 1.17 − 0.25 − 2.49
K 0.604 0.0008 0.13 0.11 1.11 0.27
Mg 0.865 0.0082 0.94 0.82 − 0.58 − 1.77
Mn 0.036 0.0002 0.60 0.48 − 1.11 0.86
Na 0.358 0.0012 0.34 0.27 − 1.15 − 0.06
Ni 0.027 0.0031 11.6 10.1 − 0.23 − 2.24
P 0.079 0.0002 0.22 0.19 0.38 − 2.11
Pb 0.015 0.0001 0.59 0.48 0.35 − 1.82
Rb 0.004 0.0003 8.10 6.29 − 0.26 − 0.89
S 0.612 0.0068 1.10 0.89 − 0.44 − 1.50
Si 8.950 0.0764 0.85 0.67 0.86 − 0.87
Sr 0.042 0.0003 0.65 0.55 0.00 − 2.31
Ti 0.331 0.0012 0.35 0.26 0.91 − 0.15
Zn 0.037 0.0016 4.29 3.41 − 0.51 − 0.90
Zr 0.082 0.0008 0.92 0.76 0.25 − 1.42
  1. SD standard deviation, RSD relative standard deviation, RAD relative average deviation