甲基橙-溴酸钾体系催化动力学光度法测定微量甲醛  

Determination of Trace Formaldehyde by Catalytic Kinetic Spectrophotometry of Methyl Orange-KBrO_3

作　　者：李国强[1] 王小波[1] 孟建新[1] 

机构地区：[1]暨南大学化学系,广州市石牌510632

出　　处：《光谱实验室》2005年第1期30-33,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：广东省自然科学基金 (No.0 10 380 )资助项目

摘　　要：基于在硫酸介质中 ,甲醛对溴酸钾氧化甲基橙的促进作用 ,建立了测定微量甲醛的催化动力学光度法。本方法线性范围为 0 .0 2 2— 1.4 5 3μg·m L-1,其浓度水平为 0 .72 7μg· m L-1甲醛的 4次平行测定的RSD为 4 .4 8%。利用此法测定了水发食品牛百叶和虾仁中甲醛的含量 ,结果和国标的乙酰丙酮比色法所测结果一致。A novel catalytic kinetic spectrophotometric method for the determination of for maldehyde was developed is based on the acceleration effect of formaldehyd e on the oxidation reaction of methyl orange by bromate ions in sulphuric acid m edium.The linear range is 0.022—1.453μg·mL -1 of formaldehyde.The RSD fo r a 0.727μg·mL -1 sample is 4.48%.The method has been applied to the dete rmination of free formaldehyde in the water-bloated food product with satisfact ory results.

关 键 词：水发食品 微量甲醛 RSD 催化动力学光度法 含量 乙酰丙酮比色法 测定 虾仁 溴酸钾 国标 

分 类 号：O657[理学—分析化学] R155[理学—化学]