Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Determination of Dissolved Oxygen by the Rideal Stewart and Alsterberg Modifications of the Winkler Method.
Author Ruchhof, C. C. ; Moor, W. Allan ; Placa, O. R. ;
CORP Author Public Health Service, Cincinnati, Ohio. Stream Pollution Investigations Station.
Year Published 1965
Stock Number PB-215 100
Additional Subjects ( Water pollution ; Water analysis) ; ( Water analysis ; Dissolved gases) ; ( Oxygen ; Water analysis) ; Water pollution detection ; Winkler analysis
Library Call Number Additional Info Location Last
NTIS  PB-215 100 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 11p
Among the many modifications of the Winkler method advocated for the determination of dissolved oxygen in the presence of nitrite, probably the most widely used is the Rideal-Stewart method. It has been recognized for some time, however, that in the presence of organic matter this modification gives low results. Noll proposed the use of urea for the destruction of nitrites but its use requires a long period of contact (approximately twenty-four hours) and is, therefore, impracticable. Alsterberg substituted sodium azide for urea and found that the destruction of nitrite could be accomplished in a few minutes. The report presents a comparative study of the sodium azide and Rideal Stewart modifications during the course of a survey of the Scioto River.