| Devices called lysimeters are sometimes inserted into the ground to collect subsurface water, called leachate. |
| With the acidulation of the leachate with sulfuric acid, the vanadium is precipitated as sodium hexavanadate. |
| The leachate was collected and then chemically converted to true saltpeter, potassium nitrate, by mixing it with a solution of potash. |
| All landfills, including those not in use, produce landfill gases and leachate, or water that has permeated the surrounding soil. |
| The residual material no longer produces methane, and leachate is much reduced. |
| Then they poured distilled water into the columns and captured this leachate as it flowed out the bottom into flasks. |
