Record Display for the EPA National Library Catalog

RECORD NUMBER: 5 OF 12

OLS Field Name OLS Field Data
Main Title Evaluation of 1 percent neutral buffered potassium iodide procedure for calibration of ozone monitors /
Author Beard, Michael E.
Other Authors
Author Title of a Work
Margeson, J.
Ellis, Elizabeth C.
CORP Author Environmental Monitoring and Support Lab., Research Triangle Park, N.C.
Publisher U.S. Environmental Protection Agency,
Year Published 1977
Report Number EPA-600/ 4-77-005
Stock Number PB-267 985
OCLC Number 09181197
Subjects Atmospheric ozone--Measurement--Calibration.
Additional Subjects Gas detectors ; Calibrating ; Ozone ; Potassium iodide ; Gas analysis ; Chemical analysis ; Performance evaluation ; Air pollution ; Monitors ; Oxidizers ; Error analysis ; Experimental design ; Design criteria ; Procedures ; Air pollution detection
Internet Access
Description Access URL
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=9101A46G.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
EJBD ARCHIVE EPA 600-4-77-005 Headquarters Library/Washington,DC 05/06/2014
EJBD  EPA 600-4-77-005 Headquarters Library/Washington,DC 12/02/2015
EKAM  EPA-600/ 4-77-005 Region 4 Library/Atlanta,GA 05/27/1994
EKBD  EPA-600/4-77-005 Research Triangle Park Library/RTP, NC 10/07/2005
ESAD  EPA 600-4-77-005 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-267 985 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation v, 45 pages : illustrations, charts, tables ; 28 cm.
Abstract
The 1 percent neutral buffered potassium iodide procedure, as specified for calibration of ozone monitors in the Environmental Protection Agency (EPA) reference method for measurement of photochemical oxidants, was evaluated. The procedure was found to be vulnerable to error in three major areas: (1) the time allowed for measurement of iodine absorbance, (2) purity of potassium iodide reagent, and (3) type of impinger used. Variations in results produced by minor changes within the specifications of the procedure suggest that the method is difficult to control. Improved specifications and procedures were documented to minimize the effect of these parameters on results and to aid the user in proper use of the procedure. The improved procedure shows a positive bias of 7.5 + or - 3.4 percent. The Environmental Monitoring and Support Laboratory (EMSL), EPA, has decided that further work to improve the procedure is not warranted and has initiated work on a program to evaluate candidate procedures to replace the neutral buffered potassium iodide procedure.
Notes
Includes bibliographical references (pages 26-27).
Contents Notes
The 1 percent neutral buffered potassium iodide procedure, as specified for calibration of ozone monitors in the Environmental Protection Agency (EPA) reference method for measurement of photochemical oxidants, was evaluated. The procedure was found to be vulnerable to error in three major ares: 1) the time allowed for measurement of iodine absorbance, 2) purity of potassium iodide reagent, and 3) type of impinger used. Variations in results produced by minor changes within the specifications of the procedure suggest that the method is difficult to control. Improved specifications and procedures were documented to minimize the effect of these parameters on results and to aid the user in proper use of the procedure. the improved procedure shows a positive bias of 7.5 « 3.4 percent. The Environmental Monitoring and Support Laboratory (EMSL), EPA, has decided that further work to improve the procedure is not warranted and has initiated work on a program to evaluate candidate procedures to replace the neutral buffered potassium iodide procedure.