GB 5009.267-2020 is applicable to determinaton of iodine in algae and algae products, grains, vegetables, fruit, beans and beans products, milk and milk products, meat, fish, eggs and infant food. It replaces GB 5009.267-2016. It includes scope, principle, reagent and materials, apparatus and equipment, analysis steps, formulation of the result, accuracy and others of four methods for determination of iodine in foods.