Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Sampling Frequency for Water Quality Monitoring.
Author Harmeson, Robert H. ; Barcelona, Michael J. ;
CORP Author Illinois State Water Survey Div., Champaign.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Year Published 1981
Report Number ISWS-81-CON-279; EPA-R-804337;
Stock Number PB82-145343
Additional Subjects Water pollution ; Streams ; Lakes ; Quality control ; Sites ; Periodic variations ; Statistical analysis ; Water quality ; Sodium ; Chlorides ; Calcium carbonates ; Inorganic nitrates ; Ammonium ; Phosphorus ; Metals ; Turbidity ; Collecting methods ; Tables(Data) ; Illinois ; Water pollution sampling
Library Call Number Additional Info Location Last
NTIS  PB82-145343 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 95p
The results of a comprehensive study of the effect of sampling frequency on observations of trends in water quality parameters are reported for a 9-station network in Illinois. The study period covered two discontinuous annual periods from October 1976 - October 1977 and June 1978 - June 1979. Based on an acceptable deviation of 10 percent from the annual daily mean values, optimum sampling frequencies were found to vary from monthly to more often than daily. The average percent deviation due to monthly sampling was found to be acceptable for the following water quality parameters: sodium, chloride, alkalinity, hardness, and total dissolved solids. More frequent sampling seems to be indicated for nitrate, ammonium, and dissolved and total phosphorus. The remaining parameters -- iron, manganese, copper, zinc, and turbidity -- demand more frequent sampling than on a monthly basis to ensure acceptable deviations from long-term means.