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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Effect of pH on H2O2 production in the radiolysis of water
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Effect of pH on H2O2 production in the radiolysis of water

机译：pH对水辐射分解中H2O2产生的影响

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The yields of hydrogen peroxide have been measured in the radiolysis of aqueous solutions of acrylamide, bromide, nitrate, and air in the pH range of 1-13. Hydrogen peroxide is the main stable oxidizing species formed in the radiolysis of water, and its long-term yield is found to be very sensitive to the system used in the measurements. Experiments with γ-irradiation combined with model calculations show that the primary yields of hydrogen peroxide are nearly independent of pH in the range of 2-12. Slightly higher primary yields are suggested at very low pH in particular when O2 is present, while the yields seem to decrease at very high pH. Irradiations were performed with 5 MeV H ions, 5 MeV He ions, and 10 MeV C ions to evaluate the intratrack and homogeneous kinetic contributions to H2O2 formation with different ions. Many of the trends in hydrogen peroxide yields with pH observed with γ-irradiations are observed with irradiation by the heavy ions. The lower yields of radicals in the homogeneous phase with the heavier ions tend to minimize the effects of radicals on the hydrogen peroxide yields at long times.
机译：已在1-13的pH范围内，对丙烯酰胺，溴化物，硝酸盐和空气的水溶液进行辐射分解，测定了过氧化氢的产率。过氧化氢是在水的放射分解过程中形成的主要稳定氧化物质，其长期产量对测量中使用的系统非常敏感。 γ射线辐照实验与模型计算相结合表明，过氧化氢的一次产率几乎与pH无关，范围为2-12。建议在非常低的pH值下，特别是在存在氧气的情况下，初级产率会略高，而在非常高的pH值下，产率似乎会下降。用5 MeV H离子，5 MeV He离子和10 MeV C离子进行辐照，以评估不同离子对H2O2形成的轨迹内和均相动力学贡献。在重离子辐照下观察到随着γ辐照观察到的pH值产生的过氧化氢产率的许多趋势。具有较重离子的均相中自由基的较低收率趋于使自由基长时间对过氧化氢收率的影响最小化。

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