Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Surrogate and matrix spike recoveries in chlorinated samples using sodium thiosulfate, sodium arsenite and l-ascorbic acid as dechlorinating agents /
Author Warner, Susan. ; Warner, S. C. ; Slayton, J. L.
Other Authors
Author Title of a Work
Slayton, Joseph Lee.
CORP Author Environmental Protection Agency, Annapolis, MD. Central Regional Lab.
Publisher U.S. Environmental Protection Agency, Central Regional Laboratory,
Year Published 1989
Report Number EPA 903/9-89-001
Stock Number PB89-160063
OCLC Number 41103652
Subjects Organic water pollutants--Analysis. ; Solvent extraction. ; Dechlorination.
Additional Subjects Chemical analysis ; Environmental pollution ; Dechlorination ; Solvent extraction ; Sodium thiosulfates ; Ascorbic acid ; Tables(Data) ; Water pollution ; Acidification ; pH ; Sampling ; Chemical reaction ; Water analysis ; Quality control ; EPA method 625 ; Water pollution detection ; Continuous extraction ; Sodium arsenite
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJAD  EPA 903/9-89-001 Region 3 Library/Philadelphia, PA 01/18/2008
EJBD ARCHIVE EPA 903-9-89-001 Headquarters Library/Washington,DC 02/27/2012
EJDD  EPA-903/9-89-001 Env Science Center Library/Ft Meade,MD 04/09/1999
NTIS  PB89-160063 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 07/22/2019
Collation 76 leaves : ill. ; 28 cm.
Chlorine reacts with various organics in environmental samples to produce undesirable artifacts. These artifacts can cause false positives to be reported, and other compounds actually present to be reported as not detected. The NPDES method (EPA Method 625) for base/neutral and acid compounds states that residual chlorine should be determined in the field. Effluents must be dechlorinated before acidification to prevent the chlorination of compounds present in the effluent. The study examined the suitability of three dechlorinating agents: sodium thiosulfate, L-ascorbic acid and sodium arsenite. The three dechlorinating reagents were also tested using the separatory funnel technique. The authors are currently using continuous extraction as the routine method of extraction for water samples. This method has been found to generally produce higher recoveries of all compounds when compared to separatory funnel extraction. The higher recoveries are due to the fact that the extraction solvent is constantly being re-distilled. This essentially results in numerous, repeated extractions using fresh solvent for each extraction.
"This work was first presented in the EPA Quality Assurance Newsletter, July 1988, Volume 10, Number 2." Includes bibliographical references (p. 50-51). "EPA-903/9-89-001."