铁(Ⅲ)-柠檬酸的光化学反应及其应用

Studies on the Photochemical Reaction of Fe(Ⅲ)-Citric Acid and Its Application

摘要: 在pH1.5的硝酸介质中,铁(Ⅲ)-柠檬酸配合物在紫外光照射下生成一种红紫色的配合物,其最大吸收波长为400nm.在选定条件下,柠檬酸浓度在0.5～80mg/L范围内与吸光度A值成正比,其摩尔吸光系数为1.36×10³L/(mol.cm).方法具有选择性好、灵敏度高、简便快速等特点,已用于实际样品分析.

Abstract: Under the conditions of pH 1.5 HNO medium Fe(Ⅲ)-citric acid complex was irradiated by ultravoilet light to form a red-voilet complex,the molar absorptivity of the complex is 1.360L/(mol.cm) at 400nm,Beer's law is obeyed in the range of 0.5～80 mg/L for citric acid.The method has shown that the advantages of this reaction are high sensitivity,good selectivity,simple and rapid,and has been applied to the determination of citric acid in drinking samples.