Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title An assessment of the CHESS sulfate and nitrate data during the period RETA performed the chemical analysis /
Author Heiderscheit, Leo T. ; Hertz., Marvin B.
Other Authors
Author Title of a Work
Hertz, Marvin Ben,
CORP Author Health Effects Research Lab., Research Triangle Park, N.C.
Publisher U.S. Environmental Protection Agency, Health Effects Research Laboratory ,
Year Published 1977
Report Number EPA/600/1-77/004
Stock Number PB 262 670
OCLC Number 42786346
Subjects Community Health and Environmental Surveillance System. ; Environmental health--Research. ; Air--Pollution--Measurement.
Additional Subjects Chemical analysis ; Inorganic nitrates ; Sulfates ; Particles ; Statistical analysis ; Concentration(Composition) ; Air pollution ; Arithmetic mean ; Numerical analysis ; Gas analysis ; Community health environmental surveillance system
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJAD  EPA 600/1-77-004 Region 3 Library/Philadelphia, PA 01/14/2000
EJBD ARCHIVE EPA 600-1-77-004 Headquarters Library/Washington,DC 10/26/2010
EJBD  EPA 600-1-77-004 c.1-2 Headquarters Library/Washington,DC 01/17/2014
EKAM  EPA 600/1-77/004 Region 4 Library/Atlanta,GA 11/19/1999
EKBD  EPA-600/1-77-004 Research Triangle Park Library/RTP, NC 06/13/2003
NTIS  PB-262 670 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation vii, 42 p. ; 28 cm.
In the early 1970s certain filters from the CHESS network were collected and sent to the Human Studies Laboratory (HSL) Bioenvironmental Laboratory Branch (BELB) for sulfate and nitrate analyses. These analyses were interrupted on October 1, 1972 and subsequently continued under contract signed March 1973 with Rickman, Edgerley, Tomlinson, and Associates (RETA). Many of the filters were not analyzed until RETA became fully operational in May 1973, whereupon their measurements began to be inexplicably and consistently low. The disparity between HSL results and RETA's findings engendered an investigation involving reanalyses to verify the apparent disparity, and then to determine a statistical adjustment factor to correct for anomalies. In November 1974 Rockwell International undertook the reanalyses of these CHESS filters. In Rockwell's reanalyses, the difference in RETA's sulfate data showed a mean ratio of 51%, but the results on nitrates were inconclusive. The effects of time and handling were not conclusively determined, although there was an indication that nitrates decompose with timelapse more significantly than sulfates. Based on the results of this report, it was recommended that CHESS measurements for sulfates be increased by 51% for all sites for the entire period RETA performed these analyses.