【摘要】 离子交换树脂比色法测定Fe²⁺,是以邻菲绕啉为显色剂,在pH4.6的柠檬酸-柠檬酸钠缓冲液中,用柠檬酸-氨水混合液（pH5.0）作掩蔽剂,可准确、快速测定强化奶粉中的Fe²⁺,利用该法测定了全脂奶粉、麦乳精、强化京果粉、乐口福、桂园晶中的Fe²⁺。更多还原

【Abstract】 A new spectrophotometric method, ion-exchanger colorimetry for measuring iron (Ⅱ) in powdered milk fortified with iron(Ⅱ) has been developed. The method was based on the direct measurement of the resin phase absorbance after the absorption of colored sample complex species. In this method, 1,10-phenanthroline was used as the colour reagent, citric acid-sodium citrate as buffer and citric acid-ammonia as masking agent.The recovery rate of the method was 102%. Coefficient of variation was 5.84%.This method was a sensitive, reliable and simple analytical method for the determination of iron (Ⅱ) in powdered milk fortified with iron (Ⅱ).It was also possible to determine iron(Ⅱ) in powder milk and other food.更多还原