Chemical Degradation Studies on a Series of Dithiophosphinic Acids

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Industrial & Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie400972r· OSTI ID:1122653

Freiderich, Melissa E ^[1]; Delmau, Laetitia Helene ^[1]; Peterman, D. R. ^[2]; Marc, Philippe L ^[1]; Klaehn, John D. ^[2]

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1. ORNL
2. Idaho National Laboratory (INL)

In this study a significant increase in the stability of a series of dithiophosphinic acids (DPAHs) under oxidizing acidic conditions was achieved. The degradation behavior of a series of DPAHs, designed for lanthanide/actinide separation, was examined. The stability of the DPAHs, when contacted with varying nitric acid concentrations, was tested and monitored using 31P {1H} NMR. Changes in the functional groups of the DPAHs resulted in substantial increases in the stability. However, all the DPAHs eventually showed signs of degradation when placed in contact with 2 M HNO3. The addition of a radical scavenger, hydrazine, inhibited the degradation of the DPAHs. With small amounts of hydrazine, five of the DPAHs remained stable for over a month in direct contact with 2 M HNO3.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1122653
• Journal Information: Industrial & Engineering Chemistry Research, Vol. 53, Issue 9; ISSN 0888--5885
• Country of Publication: United States
• Language: English