More Information:
Maximum Permissible Concentrations of Potentially Toxic Elements (PTE) in Soil after Application of Sewage Sludge to Agricultural Land & Annual Rates of Addition
PTE limits for arable soil
| Potentially toxic elements (PTE) |
Maximum permissible concentration of PTE in soil (mg/kg dry solids) |
Maximum permissible average annual rate of PTE addition over 10 years (kg/ha) |
| pH |
| 5.0-5.5 |
5.5-6.0 |
6.0-7.0 |
>7.0 |
| Zinc |
200 |
200 |
200 |
300 |
15 |
| Copper |
80 |
100 |
135 |
200 |
7.5 |
| Nickel |
50 |
60 |
75 |
110 |
3 |
| |
For pH >5.0 |
|
| Cadmium |
3 |
0.15 |
| Lead |
300 |
15 |
| Mercury |
1 |
0.1 |
| Chromium |
400 |
15 |
| Molybdenum |
4 |
0.2 |
| Selenium |
3 |
0.15 |
| Arsenic |
50 |
0.7 |
| Fluoride |
500 |
20 |
PTE limits for grassland
| Potentially toxic elements (PTE) |
Maximum permissible concentration of PTE in soil (mg/kg dry solids) |
| pH |
| 5.0-5.5 |
5.5-6.0 |
6.0-7.0 |
>7.0 |
| Zinc |
200 |
200 |
200 |
300 |
| Copper |
130 |
170 |
225 |
330 |
| Nickel |
80 |
100 |
125 |
180 |
| |
For pH >5.0 |
| Cadmium |
3 |
| Lead |
300 |
| Mercury |
1.5 |
| Chromium |
600 |
| Molybdenum |
4 |
| Selenium |
5 |
| Arsenic |
50 |
| Fluoride |
500 |