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Table 7 Descriptive statistics of elements contents (weight%) in KACST302 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 0.146 0.0020 1.34 1.09 − 0.29 − 1.45
Br 0.021 0.0001 0.25 0.23 − 0.37 − 2.80
Ca 3.350 0.0082 0.24 0.17 0.00 − 1.20
Cl 1.147 0.0049 0.43 0.36 − 1.23 − 0.84
Cu 0.018 0.0008 4.67 3.94 − 0.14 − 1.78
Fe 0.291 0.0025 0.86 0.67 0.90 − 0.17
K 0.976 0.0042 0.43 0.38 − 0.40 − 2.31
Mg 0.240 0.0012 0.49 0.37 0.67 − 0.45
Mn 0.033 0.0048 14.6 13.3 − 0.36 − 2.77
Na 0.102 0.0005 0.48 0.40 − 1.23 − 0.84
Ni 0.017 0.0028 16.76 13.6 − 1.11 − 0.59
P 0.095 0.0014 1.51 1.28 − 0.13 − 1.97
S 0.542 0.0033 0.61 0.51 − 0.14 − 1.91
Si 6.404 0.0079 0.12 0.10 − 1.11 0.27
Sr 0.016 0.0006 4.04 3.51 − 0.55 − 1.85
Ti 0.027 0.0008 2.98 2.24 0.17 − 0.99
Zn 0.014 0.0012 8.28 7.05 − 0.30 − 1.64
  1. SD standard deviation, RSD relative standard deviation, RAD relative average deviation
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BMC Chemistry

ISSN: 2661-801X

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