Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Combined Effects of Chlorine and Ammonia on Litter Breakdown in Outdoor Experimental Streams.
Author Newman, R. M. ; Perry, J. A. ;
CORP Author Minnesota Univ., St. Paul. Dept. of Forest Resources.;Environmental Research Lab., Duluth, MN.
Publisher c1989
Year Published 1989
Report Number EPA-R812468; EPA/600/J-89/274;
Stock Number PB90-185141
Additional Subjects Chlorine ; Water pollution ; Ammonia ; Aquatic plants ; Streams ; Tables(Data) ; Graphs(Charts) ; Biodeterioration ; Reprints ; Decontamination ; Potamogeton crispus
Library Call Number Additional Info Location Last
NTIS  PB90-185141 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/15/1990
Collation 13p
The response of Potamogeton crispus L. breakdown to controlled doses of different levels of chlorine and chlorine + ammonia was investigated over two years in outdoor experimental streams. In 1985, downstream riffles of 2 streams were dosed (observed in-stream concentrations) at ca. 10 micro g/L Total Residual Chlorine (TRC), one stream at 64 micro g/L TRC and one stream at 230 micro g/L TRC. Two control streams were not dosed and the upstream riffles of each stream served as within stream controls. In Aug-Sep, all three streams with chlorine + ammonia (6, 56 and 146 micro g/L TRC + 2.5 mg/L ammonia) and the 70 micro g/L TRC alone stream had significantly lower decomposition rates in the downstream dosed sites. For these streams, downstream decay rates ranged from 46% (high chlorine + ammonia) to 73% (low chlorine + ammonia) of the upstream control rates. No other up-down pairs were different during the trial. Up and downstream sites of the stream dosed with 2.5 mg/L ammonia alone were nearly identical for both trials (<3% difference). These results indicate that TRC at less than 250 micro g/L can significantly reduce litter decomposition and strongly suggest that addition of ammonia to chlorinated water can increase the toxic effect of chlorine. (Copyright (c) 1989 Kluwer Academic Publishers.)