MRS Proceedings


Hydrolysis of Hydroxamic Acid Complexants in the Presence of Non-Oxidizing Metal Ions

2011 MRS Fall Meeting.

Scott Edwardsa1, Fabrice Andrieuxa1, Colin Boxalla1, Robin Taylora2 and David Woodheada2

a1 Engineering Deparment, Lancaster University, Lancaster, Lancashire, LA1 4YW, U.K.

a2 The National Nuclear Laboratory, Central Laboratory, Sellafield, Cumbria, CA20 1PG, U.K.


Simple Hydroxamic acids (XHAs) are salt free, organic compounds with affinities for hard cations such as Fe3+, Np4+, Pu4+ and have been identified as suitable reagents for the control of Pu and Np in advanced nuclear fuel reprocessing. Building upon previous work on the neptunium(IV)-formohydroxamic(FHA) acid system [1], a model that describes the hydrolysis of the acetohydroxamate moiety has been extended to include hydrolysis of bishydroxamatoneptunium(IV) complex. The model has been used to determine the rate constants for hydrolysis of mono- and bis-acetohydroxamatoneptunium(IV) at 25 °C, which were found to be 1.0×10-5 dm3 mol-1 s-1 and 5.0×10-5 dm3 mol-1 s-1, respectively.

Key Words:

  • actinide;
  • kinetics;
  • Pu
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