Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title New Method for Determining Effluent Toxicity Using Duckweed 'Lemna minor'.
Author Taraldsen, J. E. ; Norberg-King., T. J. ;
CORP Author Environmental Research Lab.-Duluth, MN.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/206;
Stock Number PB91-116129
Additional Subjects Toxicity ; Aquatic plants ; Sensitivity ; Test methods ; Chlorophylls ; Production ; Soils ; Minnows ; Waste water ; Tests ; Industrial wastes ; Tables(Data) ; Reprints ; Waterfowl ; Lemna minor ; Duckweed ; Vascular plants ; Chemicals
Library Call Number Additional Info Location Last
NTIS  PB91-116129 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/04/1991
Collation 9p
Duckweed (Lemna minor), a small vascular plant, grows rapidly, is sensitive to a wide variety of toxicants and is easy to culture. A method is described that measures duckweed frond growth and chlorophyll levels as indicators of growth inhibition. The method requires a small testing volume (15 ml) of reconstituted test medium that is prepared by using commercial grade soil to promote frond and chlorophyll production. A variety of single toxicants, industrial effluents and wastewater treatment plant effluents were tested. For most chemicals, the duckweed was as sensitive as other frequently used test species. The comparative toxicities to Ceriodaphnia dubia and fathead minnows (Pimephales promelas) with various effluents indicates that, for some industrial effluents, duckweed was the most sensitive indicator used.