在规定的条件下，模拟食物和饮料的液体与样品材料的模制品接触。然后确定液体的甲醛含量，并计算每单位面积含量的甲醛提取量。给出了使用变色酸二钠盐或乙酰丙酮作为试剂测定液体中甲醛的两种分光光度法

Liquids simulating fodd and beverages are placed in contact with mouldings of the sample material, under defined conditions. The formaldehyde content of the liquid is then determined and the quantity of formaldehyde extracted per unit area of content is calculated. Two spectrophotometric methods for the determination of formaldehyde in the liquid, using chromotropic acid disodium salt or acetylacetone as reagents, are given.