This part of ISO 3890.IDF 75 describes general considerations and specifies extraction methods for the determination of residues of organochlorine pesticides in milk and milk products.A method for high-fat products is specified in Annex A.Guidance is given on the conduct of analyses in the presence of polychlorinated biphenyls (PCBs) in Annex B.The methods are applicable to: a-HCH; B*-HCH; .-HCH; aldrin/dieldrin; heptachlor and heptachlorepoxide; isomers of DDT, DDE, TDE; chlordane and oxychlordane; and endrin. Certain methods are applicable to d-ketoendrin and HCB.