Photolysis Of Polyphosphate Ions In Alkaline Aqueous Solutions

J.A. ROSSO; M.C. GONZALEZ; D.O. MÁRTIRE.

INTERNATIONAL JOURNAL OF CHEMICAL KINETICS

JOHN WILEY & SONS INC

Año: 2000 vol. 32 p. 111 - 117

0538-8066

Photolysis of pyrophosphate and tripolyphosphate ions in aqueous solution is proponed to produce electron detachment with formation of pyrophosphate and tripolyphosphate radicals (with quantum yields < 0.1 at 266 nm), respectively. Formation of P2O7.3- is observed after photolysis of both polyphosphate ions, because decomposition of P3O10.4- yields P2O7.3-. The latter radical further react with hydroxyl ions (k = 1.4 x 106 M-1 s-1) generating HO. Radicals. The reaction of the solvated electrons with molecular oxygen produces O2.-. The rate constants for the reaction of SO4.- radicals with P2O74- and P3O105- were also measured.