AUGUST, 1967 THE ANALYST Vol. 97, No. 1097 Determination of Residues of Organophosphorus Pesticides in Foods A Review* BY D. C. ABBOTT AND H. EGAN (Ministry of Technology, Laboratovy of the Govevnment Chemist, Cornwall House, Stamfovd Street, London, S.E.l) SUMMARY OF CONTENTS Introduction Extraction procedures Cl