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: α-HCH; β-HCH; γ-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.