Etrimfos residues in rapeseed oil during laboratory scale refining

Abstract

Residues of etrimfos ( O-6-ethoxy-2-ethylpyrimidin-4-yl- O,O-dimethylphosphorothionate) in rapeseed oil were examined during a laboratory scale refining technique. Little loss of residue occurred during neutralisation; however, appreciable loss occurred during bleaching, and 94.3–99.5% loss occurred after steam distillation. The aqueous distillate contained 12% of the etrimfos present at the start of distillation. The extracted meal contained no detectable etrimfos residue.