Springer Online Journal Archives 1860-2000
Energy, Environment Protection, Nuclear Power Engineering
Conclusions 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.
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