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Table 6 Descriptive statistics of elements contents (weight%) in KACST301 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 0.0048 0.0009 19.1 16.0 − 1.23 − 0.82
Ca 0.5953 0.0005 0.08 0.07 1.23 − 0.84
Cl 0.4019 0.0097 2.42 2.03 − 0.46 − 1.68
Cu 0.0141 0.0004 2.59 2.06 0.12 − 1.16
Fe 0.0489 0.0112 23.0 18.2 − 0.96 − 0.57
K 2.5771 0.0550 2.13 1.76 0.66 − 1.30
Mg 0.0567 0.0008 1.36 1.12 − 0.25 − 1.28
P 0.0815 0.0017 2.09 1.76 0.07 − 1.91
Rb 0.0080 0.0003 3.76 3.13 − 0.83 − 1.28
S 0.0809 0.0002 0.21 0.17 − 0.62 − 1.40
Si 0.0454 0.0145 31.9 20.6 2.58 6.75
Sr 0.0091 0.0011 11.6 9.27 0.21 − 1.03
Zn 0.0068 0.0013 18.7 14.7 0.33 − 0.74
  1. SD standard deviation, RSD relative standard deviation, RAD relative average deviation