Yields of radiation products in sodium metaphosphate glasses

Yoshimitsu Kobayashi, Aaron Barkatt*, Joseph Rabani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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)64-, 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 ∈500(MP+) (the extinction coefficient of MP+ at 500 nm) = (1.92 ± 0.17) × 103 M-1 cm-1. MP- reacts with aqueous O2 to produce peroxy radicals (O2- or MPO2-). Whatever peroxy radicals are formed, they decay in water to produce H2O2. MP- does not react with N2O and does not produce H2 upon reaction with alcohols in acid solutions. It is concluded that MP- does 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. k(eaq- + MP) < 1 × 106 and k(OH + MP) < 5 × 106 M-1 sec-1.

Original languageEnglish
Pages (from-to)752-756
Number of pages5
JournalJournal of Physical Chemistry
Volume78
Issue number7
DOIs
StatePublished - 1974

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