葡萄糖振荡体系及检测Cr(Ⅵ)方法

Glucose Oscillating System and A New Means of Detecting Cr(Ⅵ) Ion

研究了以葡萄糖为有机底物与B rO-3-Mn2+-H2SO4-丙酮组成的振荡反应体系在恒温条件下进行的振荡反应。结果表明,反应体系溶液颜色在粉红色与无色之间交替变化,有典型的振荡波型;诱导期及振荡周期反应的表观活化能分别为80.38和70.95 kJ/mol,并得到体系振荡反应物浓度范围,且振荡反应有B r2产生。探讨了温度、反应物浓度及卤素对振荡反应的影响,利用此体系检测Cr(Ⅵ)离子,结果满意。

An oscillating reaction system was composed of BrO3^--Mn^2＋-H2 SO4-Acetone and the glucose substrate. The reaction was conducted at a constant temperature. The results show that the solution color changed between pink and uncolored alternately. The oscillating wave is typical. The apparent activation energy of the reaction was 80.38 kJ/mol at reduced stage, and 70. 95 kJ/mol at oscillating stage. The concentration range of the reactants was established. The product of Br2 was confirmed during the oscillating reaction. The effects of temperature, reactant concentration, Cl^-, Br^-, I^ -, on oscillating reaction were also discussed and the concentration of Cr （ Ⅵ ） was determined in the oscillating reaction system with satisfied results.