催化动力学分析法测定食品中的痕量锌  

Determination of Trace Zinc on the Oxidation of Indigo Carmine by Catalytic Kinetics Spectrophotometry

作　　者：黄湘源[1] 黄小兵[1] 朱敏[1] 余慧剑[1] 

机构地区：[1]南昌大学化学系,江西南昌330047

出　　处：《南昌大学学报（理科版）》2006年第1期36-39,共4页Journal of Nanchang University(Natural Science)

摘　　要：在H2SO4介质中,痕量锌能灵敏地催化K2S2O8氧化靛蓝胭脂红褪色反应。研究了该催化褪色反应的最佳动力学条件和参数,建立了测定痕量锌的催化动力学新方法,方法检出限为4.18×10-8g/mL,线性范围为(0.25-3.5μg/25)mL,将其用于食品(黄豆、豌豆、奶粉)中锌的测定,获得了满意的结果。It has been observed that trace zinc can sensitively catalytic the discoloration reaction of Indigo Carmine oxidized by K2S2O8 in the H2SO4 medium. The kinetic optimum conditions of the catalytic reaction was investigated and a new method for the determination of trace zinc was proposed. The linear range for determination of zinc is （0.25 -3.5） μg/25 mL and the detection of limit is 4.18 × 10^-8 g/mL. This method has been applied to determine zinc in food with satisfactory results.

关 键 词：催化动力学光度法 靛蓝胭脂红 锌 

分 类 号：O657.32[理学—分析化学]