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Table 5 Descriptive statistics of elements contents (weight%) in KACST403 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

1.756

0.0098

0.56

0.44

− 0.28

0.04

Br

0.004

0.0004

9.90

6.71

− 1.68

3.37

Ca

22.57

0.0488

0.22

0.18

− 1.23

− 0.84

Cl

1.042

0.0185

1.77

1.26

0.15

0.03

Cr

0.048

0.0039

8.19

6.38

− 0.68

− 0.07

Fe

1.026

0.0335

3.26

2.09

2.54

6.55

K

0.818

0.0021

0.25

0.22

− 0.17

− 2.10

Mg

1.199

0.0069

0.58

0.41

0.17

0.34

Mn

0.030

0.0010

3.24

2.85

− 0.37

− 2.13

Na

1.121

0.0121

1.08

0.91

0.41

− 1.53

Ni

0.014

0.0012

8.56

6.77

0.42

− 1.36

P

0.026

0.0012

4.79

3.62

− 0.45

− 1.22

Rb

0.004

0.0002

6.12

4.93

− 0.12

− 0.77

S

0.198

0.0034

1.72

1.48

− 0.20

− 2.20

Si

11.57

0.0488

0.42

0.35

− 1.23

− 0.84

Sr

0.308

0.0011

0.36

0.29

− 0.25

− 0.94

Ti

0.190

0.0008

0.43

0.30

0.00

− 1.20

Zn

0.003

0.0007

20.7

16.9

0.16

− 1.76

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