STEWART. CAIRNS ty of response thus obtained in the range 0.05-10 ng for CT and EDB and in the range 1.5-40 ng for EDC was similar to that obtained with 100% acetone. Reproducibility of response was better with 100% acetone as the extraction solvent, which became the solvent of choice for extraction of cereal samples.Recoveries by the method of standard addition by which amounts of 1-1000 Mg of fumigant in standard solutions were added to acetone extracts of untreated wheat to a total volume of 10 ml showed that amounts ranging from 0.1 to 40 ng of CT and EDB and from 1.5 to 100 ng of EDC could be measured with 95-100% recovery by EC detection.

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