DIN EN ISO 12779:2013-08

This International Standard specifies a method for the determination of the water content of lactose by Karl Fischer (KF) titration. The test sample is directly titrated with a commercially available two-component Karl Fischer reagent. The water content is calculated from the amount of reagent used. Titration at a temperature of approximately 40 °C gives shorter titration times and sharper end points. Only at this or higher temperatures is the use of a one-component Karl Fischer reagent recommended. The text of ISO 12779:2012 has been prepared by Technical Committee ISO/TC 34 "Food products" (secretariat: AFNOR, France), Subcommittee SC 5 "Milk and milk products" (secretariat: NEN, Netherlands) of the International Organization for Standardization (ISO) and has been adopted as EN ISO 12779:2013 by Technical Committee CEN/TC 302 "Milk and milk products - Methods of sampling and analysis" (secretariat: NEN, Netherlands). The committee responsible for this standard is NA 057-05-13 AA "Milch und Milcherzeugnisse - Probenahme- und Untersuchungsverfahren" ("Milk and milk products - Methods of sampling and analysis") at DIN.