Other Applications
- Phosphoric acid is used as an external standard for phosphorus-31 Nuclear magnetic resonance (NMR).
- Phosphoric acid is used for high-performance liquid chromatography.
- Phosphoric acid is used as a chemical oxidizing agent for activated carbon production, as used in the Wentworth Process.
- Phosphoric acid is used as the electrolyte in phosphoric acid fuel cells.
- Phosphoric acid is used with distilled water (2–3 drops per gallon) as an electrolyte in oxyhydrogen (HHO) generators.
- Phosphoric acid is used as an electrolyte in copper electropolishing for burr removal and circuit board planarization.
- Phosphoric acid is used as a flux by hobbyists (such as model railroaders) as an aid to soldering.
- In compound semiconductor processing, phosphoric acid is a common wet etching agent: for example, in combination with hydrogen peroxide and water it is used to etch InGaAs selective to InP.
- Hot phosphoric acid is used in microfabrication to etch silicon nitride (Si3N4). It is highly selective in etching Si3N4 instead of SiO2, silicon dioxide.
- Phosphoric acid is used as a cleaner by construction trades to remove mineral deposits, cementitious smears, and hard water stains.
- Phosphoric acid is also used as a chelant in some household cleaners aimed at similar cleaning tasks.
- Phosphoric acid is also used in hydroponics pH solutions to lower the pH of nutrient solutions. While other types of acids can be used, phosphorus is a nutrient used by plants, especially during flowering, making phosphoric acid particularly desirable.
- Phosphoric acid is used as a pH adjuster in cosmetics and skin-care products.
- Phosphoric acid can be used as a dispersing agent in detergents and leather treatment.
- Phosphoric acid can be used as an additive to stabilize acidic aqueous solutions within a wanted and specified pH range.
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