Health & Environmental Research Online (HERO)


Print Feedback Export to File
5240928 
Technical Report 
Microanalytical methods for determining methyl bromide residues.) 
Asaka, S; Seguchi, K 
1974 
3 
107-111 
PESTAB. (11 references) (Japanese) jMethyl bromide residues in cereals were liberated by Malone's sweep codistillation method, and those in vegetables were liberated by acid reflux with n-butanol as a defoaming agent. The liberated methyl bromide was derivatized to O,O-diethyl S-methyl dithiophosphate with ammonium O,O-diethyl dithiophosphate or was derivatized to 2,5-dichlorophenyl methyl sulfide with 2,5-dichlorobenzenethiol. The two derivatives were determined by FTD gas chromatography or by ECD gas chromatography. The determination gave good sensitivity, with a detection limit of 0. 005 ppm in cereals and 0. 001 ppm in vegetables. It was found that acetone was the most appropriate solvent for the first reaction, and a combination of methanol, acetone, and acetonitrile was usable as solvent in the second reaction. s,