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Table 5 Descriptive statistics of elements contents (weight%) in KACST403 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 1.756 0.0098 0.56 0.44 − 0.28 0.04
Br 0.004 0.0004 9.90 6.71 − 1.68 3.37
Ca 22.57 0.0488 0.22 0.18 − 1.23 − 0.84
Cl 1.042 0.0185 1.77 1.26 0.15 0.03
Cr 0.048 0.0039 8.19 6.38 − 0.68 − 0.07
Fe 1.026 0.0335 3.26 2.09 2.54 6.55
K 0.818 0.0021 0.25 0.22 − 0.17 − 2.10
Mg 1.199 0.0069 0.58 0.41 0.17 0.34
Mn 0.030 0.0010 3.24 2.85 − 0.37 − 2.13
Na 1.121 0.0121 1.08 0.91 0.41 − 1.53
Ni 0.014 0.0012 8.56 6.77 0.42 − 1.36
P 0.026 0.0012 4.79 3.62 − 0.45 − 1.22
Rb 0.004 0.0002 6.12 4.93 − 0.12 − 0.77
S 0.198 0.0034 1.72 1.48 − 0.20 − 2.20
Si 11.57 0.0488 0.42 0.35 − 1.23 − 0.84
Sr 0.308 0.0011 0.36 0.29 − 0.25 − 0.94
Ti 0.190 0.0008 0.43 0.30 0.00 − 1.20
Zn 0.003 0.0007 20.7 16.9 0.16 − 1.76
  1. SD standard deviation, RSD relative standard deviation, RAD relative average deviation