| Heavy metals (μg/L) |
Percent of Leachate in Incubation Medium |
| 100% |
50% |
30% |
20% |
10% |
| Before |
After |
Before |
After |
Before |
After |
Before |
After |
Before |
After |
| Copper (Cu) |
90 |
3 |
4 |
10 |
<1 |
<1 |
<1 |
<1 |
<1 |
<1 |
| Chromium (Cr) |
230 |
130 |
100 |
100 |
50 |
20 |
30 |
20 |
6 |
70 |
| Lead (Pb) |
<12 |
<12 |
<10 |
<10 |
<10 |
<10 |
<10 |
<10 |
<10 |
<10 |
| Nickel (Ni) |
330 |
220 |
180 |
180 |
90 |
70 |
60 |
60 |
20 |
<3 |
| Zinc (Zn) |
5,580 |
3,540 |
2,900 |
2,900 |
1,640 |
690 |
1,170 |
120 |
670 |
<4 |
|
