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

Table 2 Descriptive statistics of elements contents (weight%) in KACST401 CRM

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

SD standard deviation, RSD relative standard deviation, RAD relative average deviation

ISSN: 2661-801X