Record Display for the EPA National Library Catalog


Main Title Investigation of the Orion Research ammonia monitor.
Author O'Herron, Robert J.
CORP Author Environmental Monitoring and Support Lab.-Cincinnati, Ohio. Instrumentation Development Branch.
Publisher Environmental Monitoring and Sup. Lab.,
Year Published 1977
Report Number EPA-600/4-77-028
Stock Number PB-271 648
OCLC Number 17967441
Additional Subjects Monitors ; Ammonia ; Sewage ; Water pollution ; Water analysis ; Chemical analysis ; Samples ; Electrodes ; Performance evaluation ; Field tests ; Concentration(Composition) ; Design criteria ; Laboratory tests ; Water pollution detection ; Ion selective electrodes
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-4-77-028 Headquarters Library/Washington,DC 03/15/2010
EJBD  EPA 600-4-77-028 c.1 Headquarters Library/Washington,DC 03/28/2014
ESAD  EPA 600-4-77-028 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-271 648 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 32 p. illus.
The Orion Research ammonia monitor was investigated using the Orion specifications and environmental considerations as a guide. Laboratory tests under controlled environmental conditions showed the electronic stability (drift) to be well within + or - 10 percent of reading over the temperature range 5C to 42C. Sensor stability over the temperature range 5C to 42C was tested by applying ammonia nitrogen (standard solutions of 10 mg/l, 50 mg/l, and 100 mg/l as direct input to the monitor. The results of these tests showed that automatic restandardization maintained readings within Orion's specified tolerance of + or - 10 percent of reading. Dynamic on-stream measurements were made of a secondary sewage treatment plant effluent in a field installation. These measurements were periodically compared with those of the standard method of distillation and titration. Sixty-five percent of these comparisons were within + or - 10 percent of reading. Steady-state comparisons were made of field-collected samples with the standard method for determining ammonia nitrogen. It appeared from these tests that a 5 percent loss in ammonia concentration resulted from the required straining and filtering of the sample input to the monitor. Eight of the nine samples compared were within 10 percent of the standard method.
May 1977.