Yields of radiation products in sodium metaphosphate glasses

Abstract

Metaphosphate glasses have been irradiated and dissolved in aqueous solutions, where the trapped positive and negative species, MP+ and MP-, respectively, reacted with scavengers. I-, O2, Fe(CN)e4-, Fe3+, and TMPD have been used to scavenge MP+ and MP-. From product analysis, G(MP+) = G(MP~) = 2.2 ± 0.1 was calculated. Combining this with absorbance measurements in glasses yields esoo(MP+) (the extinction coefficient of MP+ at 500 nm) = (1.92 ± 0.17) X 103 M-1 cm-1. MPreacts with aqueous O2 to produce peroxy radicals (O2or MPO2-). Whatever peroxy radicals are formed, they decay in water to produce H2O2. MPdoes not react with N2O and does not produce H2 upon reaction with alcohols in acid solutions. It is concluded that MPdoes not form eaq-or H upon its interaction with water. Pulse radiolysis experiments show that aqueous solutions of metaphosphate are relatively inert toward eaq-and OH. fe(eaq~+ MP) < 1 X 106 and A (OH + MP) < 5 X 106 M-1 sec-1.

Pulse radiolytic investigations of iodoplatinates. Application in the determination of platinum in metaphosphate glasses

“…In both cases, the absorbance was found to be linear with Pt concentration, in the first case at least up to concentrations which would correspond to 60 ppm Pt in the original glass. In actual glass samples, Pt content was found to increase with the duration and temperature of melting over the range [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] ppm. This method may be also applicable in the determination of traces of Pt in other water-soluble glasses and solids.…”