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 | 2Â > | |||
B | 0 | No SOM | Weight percent | Soil organic matter (SOM) |
1 | 5Â > | |||
2 | 5Â < | |||
C | 1 | 10 > | mg/kg | Soluble chloride (Cl−) |
2 | 10–50 | |||
3 | 50–100 | |||
6 | 100–1000 | |||
10 | 1000Â < | |||
D | 1 | 100Â > | mg/kg | Total soluble salts |
2 | 100–200 | |||
3 | 200–500 | |||
5 | 500–1000 | |||
7 | 1000–2500 | |||
9 | 2500–5000 | |||
10 | 5000Â < | |||
E | 10 | Under GWT | Ground water table (GWT)Â +Â water holding capacity (%) | Water content |
8 | Around GWT | |||
4 | Upper than GWT-Wet soil (>Â 20%) | |||
2 | Upper than GWT-Wet soil (<Â 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 | 1000Â < |
Total point | Soil corrosivity index (SCI) |
---|---|
0–10 | No corrosive |
11–20 | Partially corrosive |
21–30 | Corrosive |
31–40 | Severely corrosive |