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Table 2 Descriptive statistics of elements contents (weight%) in KACST401 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 2.609 0.0107 0.41 0.28 1.52 2.71
Ba 0.030 0.0002 0.74 0.60 0.63 − 1.04
Br 0.002 0.0001 3.29 2.33
Ca 8.763 0.0640 0.73 0.66 0.42 − 2.45
Cl 0.228 0.0010 0.42 0.36 0.76 − 1.69
Cr 0.020 0.0014 7.05 6.11 0.31 − 1.93
Fe 0.855 0.0228 2.66 2.24 − 0.10 − 1.51
K 1.130 0.0173 1.53 1.26 0.00 − 1.98
Mg 1.073 0.0138 1.29 1.10 0.36 − 2.09
Mn 0.014 0.0009 6.61 5.19 0.13 − 0.26
Na 0.313 0.0018 0.57 0.50 0.30 − 2.15
Ni 0.013 0.0015 11.4 8.44 0.21 − 0.47
P 0.039 0.0018 4.78 3.93 − 0.51 − 1.48
Rb 0.004 0.0002 3.96 3.48 − 0.38 − 2.11
S 1.511 0.0168 1.11 0.86 − 0.31 − 1.47
Si 24.08 0.2116 0.88 0.64 1.44 2.08
Sr 0.032 0.0006 1.77 1.57 0.51 − 2.15
Ti 0.122 0.0027 2.24 1.97 − 0.21 − 2.38
Zn 0.004 0.0001 4.19 3.31 0.26 − 0.97
Zr 0.023 0.0004 1.57 1.21 0.98 0.69
  1. SD standard deviation, RSD relative standard deviation, RAD relative average deviation