1 | The soil is enriched with nitrates. | |
2 | Bone-meal and nitrates are common fertilizers. | |
3 | Then anaerobic bacteria take that nitrate and turn it into harmless nitrogen gas. | |
4 | Aerobic bacteria chew up the ammonia and turn it first into nitride and then to nitrate. | |
5 | Then they immerse this electrode in a potassium nitrate electrolyte solution. |