This standard supersedes "National Food Safety Standard - Determination of Iodine in Foods for Infants and Young Children, Milk and Milk Products" (GB 5413.23-2010), "Determination of Iodine in Kelp" (SC/T 3010-2001) and "Method for Determination of Iodine in Foodstuff by As(III)-Ce4+ Catalytic Spectrophotometry" (WS 302-2008). 

Compared with the above standards, this standard has the following main changes: 

- the standard name is revised as "National Food Safety Standard - Determination of Iodine in Foods"; 

- specimen preparation and pretreatment method of oxidation-reduction titration are modified; 

- detection limit of oxidation-reduction titration is added.