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Phosphorus acid is used as an intermediate in the preparation of other phosphorus compounds like potassium phosphite, ammonium phosphite and calcium phosphite. It is actively involved in the preparation of phosphites like aminotris(methylenephosphonic acid) (ATMP), 1-hydroxyethane 1,1-diphosphonic acid (HEDP) and 2-phosphonobutane-1,2,4-tricarboxylic Acid (PBTC), which find application in water treatment as a scale or corrosive inhibitor. It is also used in chemical reactions as a reducing agent. Its salt, lead phosphite is used as PVC stabilizer. It is also used as precursor in the preparation of phosphine as well as an intermediate in the preparation of other phosphorus compounds.
Prokop, M.; Bystron, T.; Bouzek, K. Electrochemistry of phosphorus and Hypophosphorus Acid on a Pt electrode. Electrochim. Acta 2015, 160, 214-218.
Grun, A.; Kovacs, R.; Illes Nagy, D.; Garadnay, S.; Greiner, I.; Keglevich, G. Efficient Synthesis of Benzidronate Applying of Phosphorus Trichloride and phosphorus Acid. Lett Drug Des Discov 2015, 12 (1), 78-84.
Hazard Statements: H302-H314-H318
Harmful if swallowed. Causes severe skin burns and eye damage. Causes serious eye damage.
Precautionary Statements: P260u-P303+P361+P353-P305+P351+P338-P301+P330+P331-P405-P501a
IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.