The Toxicity of Guanidine Nitrate to Freshwater Aquatic Organisms.
Abstract
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 mg/L, 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 mg/L. In a second chronic test, statistically significant effects on reproduction (young per female per reproductive day) were found at 6.09 mg/L, but no effects were found at 2.90 mg/L, 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 mg/L but not at lower concentrations (181 mg/L 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1985
- Accession Number
- ADA158822
Entities
People
- W. H. Van Der Schalie
Organizations
- United States Army Medical Research and Development Command