Behavior of Hydrazine Compounds in Hard and Soft Water
Abstract
The behavior of hydrazine, 1,1-dimethylhydrazine (known also as unsymmetrical dimethylhydrazine, UDMH), Aerozine-50, and monomethylhydrazine (MMH) in hard and soft water was studied prior to evaluating their effects on aquatic organisms. Hard and soft water propellant solutions were examined over a 96-hour period for changes in physical characteristics, phenolphthalein and total alkalinity, pH, specific conductance, EDTA hardness, and dissolved oxygen (DO). All four compounds at low concentrations (0.1 and 1.0 mg/l) had no effect on these variables, but at 100 mg/l produced changes that were significantly different between hard and soft water, indicating an appreciable amount of coordination of hydrazine compounds with calcium and other hard water ions. The oxygen level was reduced by all four compounds at 100 mg/l usually within the first day; in one detailed study, hydrazine in hard water caused the greatest drop in DO at 5 to 13 hours of exposure. In general, the propellant effects were not of a magnitude to preclude conducting acute toxicity tests in an open static bioassay.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1975
- Accession Number
- ADA019401
Entities
People
- Arnold R. Slonim
Organizations
- Air Force Research Laboratory