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Stabilization of H2O2 in the presence of Fe(II) and Mn(II) impurities under alkaline conditions
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Evgeny Popov
Published/Copyright:
August 8, 2007
Abstract
Stabilization of aqueous H2O2 solutions containing small amounts of transition metal impurities [e.g., Mn(II) and Fe(II)] was studied in terms of UV/Vis and electron spin resonance spectroscopy and oxygen concentration measurements at pH ∼11. The results show that aspartic acid diethoxy succinate (AES) could stabilize H2O2 solutions when Mn(II) and Fe(II) were present. Diethylenetriamine pentaacetic acid (DTPA) showed similar behavior, but was not able to stabilize the solutions as efficiently as AES. In the long-term regime, Na-poly-alpha-hydroxy-acrylate was almost as effective a stabilizing agent as AES. Na-acrylate-3-allyloxide-2-hydroxy propane Na-sulfonate copolymer (Aqualic) could decrease H2O2 decomposition by one order of magnitude, but it was the least efficient stabilizing agent among the substances studied. Furthermore, generation of superoxide radical was not suppressed in the presence of Aqualic.
Keywords: aspartic acid diethoxy succinate (AES); diethylenetriamine pentaacetic acid (DTPA); Fe(II); H2O2; Mn(II); Na-acrylate-3-allyloxide-2-hydroxy propane Na-sulfonate copolymer (Aqualic); Na-poly-alpha-hydroxy-acrylate (PHAS); stability
Received: 2007-2-6
Accepted: 2007-6-6
Published Online: 2007-08-08
Published in Print: 2007-8-1
©2007 by Walter de Gruyter Berlin New York
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- Study of the phenolic compounds formed during pretreatment of sugarcane bagasse by wet oxidation and steam explosion
- Determination of the accessible hydroxyl groups in heat-treated Styrax tonkinensis (Pierre) Craib ex Hartwich wood by hydrogen-deuterium exchange and 2H NMR spectroscopy
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