N₂O饱和甲酸盐溶液的γ辐解。链式反应。

Gamma-radiolysis of N2O-saturated formate solutions. A chain reaction.

作者信息

Al-Sheikhly M I, Schuchmann H P, von Sonntag C

出版信息

Int J Radiat Biol Relat Stud Phys Chem Med. 1985 Apr;47(4):457-62. doi: 10.3109/rab.47.4.457.

DOI:10.3109/rab.47.4.457

Abstract

In the radiolysis of aqueous formate-containing solutions a chain reaction (i, ii) proceeds in the presence of N2O. CO2-. + N2O + H2O----CO2 + N2 + .OH + OH- (i) .OH + HCO2-.----CO2-. + H2O (ii) The chain length depends on the dose rate and the N2O concentration but not on the formate concentration. Typically, G(CO2) approximately 140 molecules (100 eV)-1 is found, with an equivalent amount of N2, at a dose rate of 3 X 10(-3) Gy s-1. The rate constant for the rate-determining step in this chain reaction has been calculated at k(i) = 1600 dm3 mol-1 s-1. The possible relevance of this chain reaction in radiation biological studies is briefly discussed.

摘要

在含甲酸盐的水溶液的辐射分解过程中，在N₂O存在的情况下会发生链反应（i，ii）。CO₂⁻ + N₂O + H₂O → CO₂ + N₂ + ·OH + OH⁻ （i）·OH + HCO₂⁻ → CO₂⁻ + H₂O （ii）链长取决于剂量率和N₂O浓度，而不取决于甲酸盐浓度。通常，在剂量率为3×10⁻³ Gy s⁻¹时，发现G(CO₂)约为140个分子（100 eV）⁻¹，同时会生成等量的N₂。该链反应中速率决定步骤的速率常数经计算为k(i) = 1600 dm³ mol⁻¹ s⁻¹。本文简要讨论了该链反应在辐射生物学研究中的可能相关性。