title: Confusion of identification of o,p'-Kelthane as heptachlor in orange rind extractives.
abstract: Both the glc and the tlc data prove that the unknown compound in the rind of Kelthane-treated oranges was not heptachlor. While the characterization is not absolutely conclusive, there can be no reasonable doubt that it iso,p'-Kelthane, known to be present in technical grade Kelthane.Other workers, using glc, reportedp,p'- ando,p'-Kelthane in the ratio of 100∶1 in 21 market fruit samples from different areas of Southern California. By analogy with DDT, if technical grade Kelthane is assumed to contain up to 20% of theo,p'-isomer this ratio found on fruits treated months previously means that on and in oranges theo,p'-isomer has much the longer half-life (RL50) of the two isomers. On the other hand, approximately equal half-lives are indicated for the two isomers in soil.This brief study emphasizes the need for checking on gas chromatographic data by a more specific method and clearly demonstrates again that improper interpretation of data may be avoided by using at least two columns possessing different retention characteristics for the compounds of interest.
authors.affiliation: Department of Entomology, University of California Citrus Research Center and Agricultural Experiment Station, Riverside, California.
authors.forename: W E
authors.initials: WE
authors.lastname: Westlake
authors.forename: R T
authors.initials: RT
authors.lastname: Murphy
authors.forename: F A
authors.initials: FA
authors.lastname: Gunther