The Toxicity of Nitroguanidine and Photolyzed Nitroguandine to Freshwater Aquatic Organisms
Technical rept. Oct 1982-Apr 1984
ARMY MEDICAL BIOENGINEERING RESEARCH AND DEVELOPMENT LAB FORT DETRICK MD
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The acute toxicity of nitroguanidine NGu to ten species of freshwater aquatic organisms was determined. Fish exposed to NGu for 96 hours included fathead minnows Pimephales promelas, bluegills Lepomis macrochirus, channel catfish Ictalurus punctatus, and rainbow trout Salmo gairdneri. Invertebrates, which were tested for 48 hours, included water fleas Daphnia magna, amphipods Hyallela azteca and Gammarus minus, midge larvae Paratanytarsus dissimili, and aquatic worms Lumbriculus variegatus. The acute toxicity of NGu was very low less than 50 percent of any of these organisms exposed to NGu were killed at concentrations up to the solubility limit of NGu in water, which ranged from about 1,700 mgL at 12 C trout tests to about 3,000 mgL at 22 C most other species. Complete photolyzation of NGu with ultraviolet light greatly increased NGu toxicity. The toxicity of phi-NGu decreased with time but was still much more toxic than NGu. Originator-supplied keywords include Acute toxicity, Algae, Amphipod, Aquatic toxicology, Bluegill, Channle catfish, Daphnia magna, Fathead minnow, Fish, Gammarus minus, Hyallela azteca, Ictalurus punctatus, Invertebrates, Lepomis macrochirus, Lumbriculus variegatus, Midge larvae, Nitroguanidine, Oligochaete, Paratanytarsus dissimilis, Pimephales promelas, Photolysis, Rainbow trout, Salmo gairdneri, and Selenastrum capricornutum.