A suprisingly useful aqueous mixture of several compounds.
Production of urine is a natural process for most animals.
- On its own, urine has a NPK rating of 0.6, 0.04 0.08
- 85% phosphoric acid is 15.2 molar, so between 500L and 1200L (130-320 gal) of urine would be required to make 1L of that acid.
- 25% ammonia (maximum non-lossy concentration) is 13.4 molar, so about 10L of urine would be required to make 1L of that solution.
- CO(NH2)2 + H2O → 2 NH3 + CO2 // 1M urea becomes 2M ammonia
- 10L (2 ammonia (0.66M urea)) = 13.4M ammonia, to be dissolved in 1L of water.
The major products of interest derived from human urine are:
Other animals' urine may also include:
- Uric acid
Maximizing urea content
- Collect urine first thing in the morning - urea is produced during the night, but is not diluted by additional water (not) consumed while you sleep.
- Collect urine within 36 hours of heavy exercise
- Collect urine from humans eating large amounts of protein rather than carbohydrates.
Obviously all of these could be done simultaneously, given the right diet, exercise, and sleeping schedule.
- Senecal, Jenna; Vinnerås, Björn (2017)
Science of The Total Environment 586; pp650-657. Elsevier
link courtesy researchgate.
- Putnam, David F. (1971) (local copy)
link courtesy NASA.