Table 3 Chemical composition of samples measured by SEM-EDS (point scanning)

From: Characterization of corrosion products on Han Dynasty iron swords excavated from Tuchengpo Cemetery in Wushan, Chongqing, China

Sample no. and layer

Spot

Element content (wt%)

Fe

Cl

S

Ca

Na

Mg

Al

Si

P

K

Cu

Fig. 7c

C1-DPL

1

92.0

7.1

n.d.

<0.5

<0.5

<0.5

<0.5

<0.5

n.d.

n.d.

<0.5

2

15.4

<0.5

<0.5

82.4

0.6

<0.5

<0.5

0.8

n.d.

<0.5

<0.5

Fig. 7a

C2-DPL

1

93.3

<0.5

<0.5

1.9

0.8

<0.5

<0.5

2.4

1.0

<0.5

n.d.

2

92.0

<0.5

4.7

0.5

0.8

<0.5

<0.5

1.1

n.d.

<0.5

<0.5

3

92.4

6.0

<0.5

<0.5

n.d.

<0.5

<0.5

<0.5

<0.5

<0.5

<0.5

Fig. 7b

C2-TM

1

26.6

0.6

1.3

55.8

4.8

0.5

0.7

7.1

0.5

2.0

n.d.

2

5.8

n.d.

<0.5

1.6

<0.5

<0.5

<0.5

92.0

n.d.

n.d.

<0.5

3

59.5

1.8

6.4

17.8

2.5

0.9

1.6

7.2

0.6

1.8

n.d.

Fig. 7d

C6-DPL

1

93.2

6.1

<0.5

<0.5

<0.5

n.d.

n.d.

<0.5

n.d.

<0.5

n.d.

2

84.9

1.6

<0.5

8.9

<0.5

n.d.

<0.5

1.2

1.6

<0.5

0.6

  1. N.d. means no observable peak distinguishable from background noise. “<0.5” means low values which are below the detection threshold.
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