US EPA

2154068 

Journal Article 

A NOTE ON USE OF FLORISIL ADSORBENT FOR SEPARATION OF POLYCHLOROBIPHENYLS FROM CHLORINATED PESTICIDES 

Bevenue, A; Ogata, JN 

1970 

Yes 

Journal of Chromatography A
ISSN: 0021-9673
EISSN: 1873-3778 

HAPAB/70/02320 

50 

1 

142 

WOS:A1970G810800022 

HAPAB It was hopefully assumed that a modidied product, Florisil PR ( pesticide redisue grade ) had become available with consistent and relable adsorbent properties. Mills ( 1968 ) reported that soluble sulfates ( Na2SO4 ) varied from 0.15 to 2.44% in 12 batches of Florisil PR which would affect the adsorptive characteristics of the Forisil to the deteriment of pesticide recoveries. Prestesting of the adsorbent by a lauric acid procedure or a known group of chlorinated pesticides is recommended. A new problem in pesticide residue analysis is the possilbe presence of polychlorobiphenyls ( PCBs ), which could lead to misinterpretation of the analystical data. L.M. Reynolds reported ( Bull. Environ. Contam. Toxicol. 4(4): 128-43; 1969; for an abstract see 69-1695 ) a method to separate PCBs from some chlorinated pesticides inclusing DDT which presumable used regular grade, not PR grade Florisil. By Reynolds' mehtod, DDT was eluted from the column with hexane and other pesticides wwith a mixture of diethyl ether-hexane. This work of Reynolds' could not be replicated using both the regular and the PR grades of Forisil. The present results are tabulated for percent recoveries. of DDT, p,p'-DDT, lindane, heptachlor, aldrin, heptachlor epoxide, DDE, and DDD and dieldirn. The data show that the present sample of regualr grade Foorisil performed satisfactorily but the PR grade did not wholly differentiate the dieldrin fraction. It is apparent that Reynolds' method for the separation of PCBs from pesticides requires the prelinimary examination of pesticide elution characteristics of the Forisil, regular, or PR grade, prior to its use. ANALYSIS 70/12/00, 602 1970