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

Table 8 Descriptive statistics of elements contents (weight%) in KACST201 CRM

Element	Average	SD	RSD%	RAD%	Skewness	Kurtosis
Al	0.0047	0.0007	15.57	13.37	0.25	− 2.00
As	0.0099	0.0045	45.62	37.74	0.92	− 0.56
Br	0.0159	0.0003	1.78	1.39	− 0.57	− 0.55
Ca	0.6066	0.0300	4.95	3.75	0.17	− 0.43
Cl	1.2443	0.0079	0.63	0.49	1.76	2.36
Fe	0.0233	0.0010	4.26	3.41	− 0.39	− 1.17
K	6.1057	0.0237	0.39	0.31	0.30	− 1.46
Mg	0.1866	0.0010	0.52	0.42	− 0.28	0.04
Na	0.3049	0.0034	1.11	0.98	0.17	− 2.41
P	1.3471	0.0111	0.83	0.67	− 0.25	− 0.94
S	1.9457	0.0223	1.14	0.99	− 0.13	− 2.22
Si	0.0355	0.0012	3.33	2.67	0.20	− 1.11
Sr	0.0067	0.0004	5.61	4.60	− 0.76	− 1.29
Zn	0.0161	0.0005	3.06	2.34	− 0.23	− 0.57

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

ISSN: 2661-801X