Animal and plant wastes contain recoverable phosphorus that can be repurposed as fertilizer. Ultraviolet-visible spectroscopy and inductively coupled plasma optical emission spectroscopy are compared for the measurement of phosphorus in salt solutions, then wastes. There is no impact of nitrate or chloride on phosphate measurements by ultraviolet-visible spectroscopy, but high concentrations interfere with phosphorus measurement by inductively coupled plasma optical emission spectroscopy. Greenhouse and swine waste can be analyzed by either technique, but more dilution is required for analysis by ultraviolet-visible spectroscopy and for swine waste. Swine waste has ∼8 times more phosphorus than greenhouse waste and is the more viable waste source for phosphorus recovery.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Atomic and Molecular Physics, and Optics
- UV-Vis spectroscopy