| Certain metals, such as hexavalent chromium and technetium-99 are reduced and precipitated in the presence of iron; whereas other metals are directly precipitated or absorbed by the iron and thus rendered immobile. Once the metals are precipitated or absorbed to the iron, the metal is immobilized within the PRB and will not leach out by flushing with groundwater. The following list summarizes the metals immobilized in the presence of zero valent iron. |
|
 |
|
|
|
| Common Name |
|
Common Element |
| Aluminum |
|
Al |
| Antimony |
|
Sb |
| Arsenic |
|
As |
| Cadmium |
|
Cd |
| Copper |
|
Cu |
| Hexavalent Chromium |
|
Cr (IV) |
| Lead |
|
Pb |
| Magnesium |
|
Mg |
| Mercury |
|
Hg |
| Nickel |
|
Ni |
| Selenium |
|
Se |
| Technetium |
|
Tc-99 |
| Uranium |
|
U |
| Vanadium |
|
V |
| Zinc |
|
Zn | |
|
|
|
| |
