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Table 6 The factors used to estimate soil corrosivity index (SCI) in the archaeological soil environment

From: A methodological approach to estimate soil corrosivity for archaeological copper alloy artefacts

Factor

Point

Value

Measurement unit

Corrosive factor

A

3

9 <

–

pH

0

5.5–9

2

4–5.5

4

2–4

5

2 >

B

0

No SOM

Weight percent

Soil organic matter (SOM)

1

5 >

2

5 <

C

1

10 >

mg/kg

Soluble chloride (Cl−)

2

10–50

3

50–100

6

100–1000

10

1000 <

D

1

100 >

mg/kg

Total soluble salts

2

100–200

3

200–500

5

500–1000

7

1000–2500

9

2500–5000

10

5000 <

E

10

Under GWT

Ground water table (GWT) + water holding capacity (%)

Water content

8

Around GWT

4

Upper than GWT-Wet soil (> 20%)

2

Upper than GWT-Wet soil (< 20%)

F

6

60

Percent of sand

Soil aeration

4

40

3

20

0

0

G

0

50 >

µs/cm

Soil conductivity

1

50–100

2

100–200

4

200–333

6

33–1000

10

1000 <

Total point

Soil corrosivity index (SCI)

0–10

No corrosive

11–20

Partially corrosive

21–30

Corrosive

31–40

Severely corrosive