Photochemical reactions of Am(V) in bicarbonate-carbonate solutions
- Institute of Physical Chemistry, Moscow (Russian Federation)
The effect of ultraviolet (UV) radiation on Am(V) in sodium carbonate and bicarbonate solutions of pH 9.00 - 11.40 was studied by spectrophotometry. An Am(IV) + Am(VI) mixture was formed at pH 9 to 10; however, the conversion of Am(V) did not exceed 60 - 70%. The reaction rate order with respect to Am(V) was about 1. A quantum yield for the reaction on photolysis with light of {lambda} = 337 nm was estimated at 0.003. The reaction rate and the conversion of Am(V) were decreased with increasing pH. The reaction started with the absorption of a UV quantum by a carbonate complex of Am(V). Its first step was presumably the electron transfer either from a water molecule to Am(V) in the coordination sphere of the excited carbonate complex of Am(V) or between two Am(V) ions in an excimer involving an excited and an unexcited carbonate complex of Am(V).
- OSTI ID:
- 171743
- Journal Information:
- High Energy Chemistry, Vol. 29, Issue 6; Other Information: PBD: Dec 1995; TN: Translated from Khimiya Vysokikh Energii; 29: No. 6, 452-455(1995)
- Country of Publication:
- United States
- Language:
- English
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