US EPA

3858739 

Technical Report 

Residue analysis of chlorobenzilate in fruits and vegetables.) 

Asaka, S; Izawa, T; Seguchi, N; Miyauchi, K 

1973 

PESTAB/74/0241 

J 

J. Pestic. Sci. 

Japanese 

PESTAB A method was developed for determining chlorobenzilate as a derivative of heptafluorobutyric acid, using GLC-ECD. The method was applied to determination of residues in fruits and vegetables. Chlorobenzilate is extracted with acetonitrile, transferred to n-hexane, cleaned up on a Florisil column, and treated with heptafluorobutyric acid in the presence of a catalyst; the derivative formed is washed and determined. The GLC-ECD conditions are: glass column 4 mm i. d. , 1000 mm long, packed with 5% SE-30; detector temperature 210 DEG C, ECD with tritium-labeled foil. Recoveries of 88. 6% and 91. 1% were obtained from radish and strawberry fortified with 0. 05 ppm of chlorobenzilate, 84. 1% from Satsuma orange fortified with 0. 1 ppm, and 93. 6% from summer orange pulp fortified with 0. 05 ppm. The same analytical procedure but without the reaction with heptafluorobutyric acid showed a sensitivity only one sixteenth of that obtained when the reaction mentioned was included in the procedure.