Fate Assessment of New Air Force Chemicals.
Abstract
Ammonium dinitramide (ADN) is hydrolytically stable in water at all environmentally relevant pHs from 2-10 at 25 deg C, with an estimated half life of about 370 years at pH 7. Biotransformation of ADN in water and soil, under aerobic and anaerobic conditions, was not observed. Aqueous and solid ADN photolyzed in sunlight very rapidly, with half lives of a few minutes in summer-fall season, making photolysis the dominant loss process for ADN in surface waters in all seasons. Quantum yields for ADN photolysis at 285 to 370 nm were 0.l plus or minus 0.02 for aqueous ADN solutions and 0.3 to 0.04 between 300 and 325 nm for solid ADN. Major products included nitrite and nitrate ions and nitrous oxide (N2O), and their proportions were unaffected by oxygen, cation nor wavelength. Solid ADN gave NO, N2O, N2 and nitrate ion. Cometabolism with glucose did lead to rapid biodegradation of ADN over 65 hours. Photolysis and biodegradation of the polyalkylperfluoroether Fomblin Z were evaluated under aerobic and anaerobic conditions. No direct photolysis is possible and no photooxidation with TiO2 photocatalyst was detected. However, slow release of fluoride ion, found in anaerobic sediments, led to an estimate of 8500 days for the half life of the biodegradation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1997
- Accession Number
- ADA332058
Entities
People
- Ronald Spanggord
- Theodore Mill
Organizations
- SRI International