Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Water Pesticides Number 1. Study Number 24.
Author Lishk, Raymond J. ;
CORP Author Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio.
Year Published 1966
Report Number PHS-Pub-999-WP-39;
Stock Number PB-173 984
Additional Subjects Insecticides ; Selection ; Pesticides ; Gas chromatography ; Separation ; Solvent extraction ; Statistical analysis ; Detection ; Water ; Solutions ; Sampling ; Chemical analysis ;
Library Call Number Additional Info Location Last
NTIS  PB-173 984 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 76p
In this study, two solutions of ethyl acetate containing different mixtures of lindane, heptachlor epoxide, DDE, and dieldrin were analyzed, both before and after dilution with water, by 31 participating laboratories. One participant used paper chromatography, and the rest used gas chromatography; four of the latter employed the microcoulometric detector, and the rest used the electron capture detector. Best resus were obtained with a mixed column packing containing both polar and nonpolar materials. Satisfactory results were also obtained with a single-component column when a prior separation of the pesticides by passage through a florisil or alumina chromatographic column was made before injection on the gas chromatograph. The newer model C-200 Dohrmann microcoulometer produced satisfactory results at the concentrations present in this sample. Failure to correct adequately for incomplete recovery of pesticide in the extraction procedure produced low results in the diluted sample.