Radiolysis of aqueous solutions of ammonium bicarbonate over a large dose range

Z.D. Draganic, A. Negrón-Mendoza, K. Sehested, S.I. Vujosevic, R. Navarro-Gonzales, M.G. Albarran-Sanchez, I.G. Draganic

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    Oxygen-free aqueous solutions of 0.05 mol dm-3 ammonium and sodium bicarbonate were studied after receiving various doses of Co-60 gammas (0.01-400 kGy) or 0.5-20 Gy pulses of 10 Mev electrons. Formate and oxalate were found to be the main radiolytic products, in addition to trace amounts of formaldehyde and an unidentified polymer. A large initial yield of formate in the gamma-radiolysis, G(HCOO-) = 2.2, is due to the reaction COO- + HCO3- reversible HCOO- + CO3-. The efficiency of organic synthesis within the large dose range studied is low and is explained by efficient pathways leading to the reformation of bicarbonate, where the reaction COO- + CO3- is particularly significant. Computer fitting of the data obtained gives k(COO- + HCO3-) = (2 +/- 0.4) x 10(3) dm3 mol-1 s-1, k(COO- + CO3-) = (5 +/- 1) x 10(7) dm3 mol-1 s-1, k(NH2 + HCO3-) < 10(4) dm3 mol-1 s-1, and k(NH2 + CO3-) = (1.5 +/- 0.5) x 10(9) dm3 mol-1 s-1.
    Original languageEnglish
    JournalRadiation Physics and Chemistry
    Issue number3
    Pages (from-to)317-321
    Publication statusPublished - 1991

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