Table 2 EDS analysis results of the soil reference materials (wt%)

From: Technologies and sources of the earliest Chinese bronze horse sculptures unearthed on the Loess Plateau

Reference material code

Data item

Component

SiO2

Al2O3

Fe2O3

CaO

MgO

Na2O

K2O

GBW07572(GSS-81)

Standard value

73.01

19.39

5.10

0.41

0.36

0.15

1.59

Average measured value

72.63

19.61

5.02

0.46

0.30

0.18

1.80

Absolute error

0.22

−0.30

−0.16

0.05

−0.06

0.03

0.21

Relative error

0.30%

−1.53%

−3.06%

11.71%

−17.22%

17.33%

13.46%

Relative standard deviation

1.21%

4.20%

5.56%

14.61%

25.07%

62.60%

20.20%

GBW07408a(GSS-8a)

Standard value

65.97

12.96

6.15

8.33

2.19

1.88

2.52

Average measured value

66.52

12.58

6.22

8.28

2.13

1.78

2.49

Absolute error

0.55

−0.38

0.07

−0.05

−0.06

−0.10

−0.03

Relative error

0.84%

−2.92%

1.07%

−0.62%

−2.65%

−5.32%

−1.29%

Relative standard deviation

1.42%

4.20%

4.17%

2.68%

6.08%

11.36%

10.16%

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