Dependence of molecular hydrogen formation in water on scavengers of the precursor to the hydrated electron
- Univ. of Notre Dame, IN (United States). Radiation Lab.
Early studies on the radiolysis of water suggested a wide variety of precursors, and mechanisms, for the formation of the observed yield of molecular hydrogen. Molecular hydrogen yields have been measured in the {gamma} radiolysis of aqueous solutions with a wide variety of scavengers of the hydrated electron and its precursors. A decrease in molecular hydrogen yield with increasing scavenging capacity of the hydrated electron is found with all solutes. Scavengers with particularly high rate coefficients for reaction with the precursors to the hydrated electron compared to the hydrated electron, such as selenate and to a lesser extent molybdate, show a more rapid decrease in hydrogen yields with increasing scavenging capacity than is observed with the other solutes. The yield of molecular hydrogen is better parameterized by the scavenging capacity for the precursors to the hydrated electron than by the scavenging capacity for the hydrated electron. Good scavengers of precursors to the hydrated electrons do not exhibit a nonscavengable hydrogen yield in the high scavenging capacity limit. These results suggest that the previously accepted nonscavengable yield of molecular hydrogen is due to precursors of the hydrated electron and it can be lowered with appropriate scavengers.
- Sponsoring Organization:
- CEA, 75 - Paris (France); USDOE, Washington, DC (United States)
- OSTI ID:
- 682158
- Journal Information:
- Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Vol. 103, Issue 29; Other Information: PBD: 22 Jul 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Scavenger studies on the radiolytic hydrogen radical and its precursor in aqueous solution using riboflavin
Molecular Hydrogen Yields from the Alpha Self-Radiolysis of Nitric Acid Solutions Containing Plutonium or Americium