The Toxicity of Guanidine Nitrate to Freshwater Aquatic Organisms.
Technical rept. Feb-Nov 84,
ARMY MEDICAL BIOENGINEERING RESEARCH AND DEVELOPMENT LAB FORT DETRICK MD
Pagination or Media Count:
The toxicity of guanidine nitrate GN to fathead minnows Pimephales promelas and water fleas Daphnia magna was determined. Based on immobilization of D. magna, the static acute 48 hour EC50 of GN was 70.2 mgL, with 95 percent confidence limits of 66.0 to 74.7. An initial 21 day flow-through chronic test with D, magna showed that significant toxic effects occurred at the lowest GN concentration tested, 4.2 mgL. In a second chronic test, statistically significant effects on reproduction young per female per reproductive day were found at 6.09 mgL, but no effects were found at 2.90 mgL, the next lowest concentration. Fathead minnows exposed to GN in a 35 day early life stage test were much less sensitive than D. magna. Statistically significant effects on survival were noted at 424 mgL but not at lower concentrations 181 mgL and below. To allow better evaluation of the potential effects of GN on aquatic communities, more data should be obtained on the toxicity of GN to additional fish, aquatic invertebrate, and aquatic plant species. The effects of water quality parameters on toxicity and the toxicity of significant environmental breakdown products of GN if any should also be determined.
- Water Pollution and Control