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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