一种检测加碘黑茶中碘含量的新方法

Oscillating System Relating Dark Tea and Detecting Iodine Based on the Oscillating System

以黑茶为底物,研究了黑茶-Br O3--Mn2+-H+-丙酮组成的振荡反应体系在恒温条件下进行的振荡反应.探讨了温度、黑茶浓度、碘酸钾干扰物对振荡反应的扰动,建立了利用此振荡体系检测加碘黑茶中碘酸根离子的方法.结果表明:反应体系有典型的振荡波形;诱导期的表观活化能为76.54 k J/mol;IO3-浓度与振荡诱导期tin有良好的线性关系,线性范围为(8.3×10-5-1.2×10-3)mol/L,线性关系回归方程为tin=4.2×102-2.5×105[IO3-],相关系数为0.995,检出限为2.8×10-5 mol/L.为加碘黑茶中碘含量的测定提供了一种新方法.

An oscillating reaction system composed of BrO3^--Mn^2＋- H^＋-Acetone and dark tea substrate was studied. The character of the oscillating curve is described at a constant temperature. Secondly, The effect of the concentration of dark tea, temperature, and the concentration of potassium iodate on the oscillating reaction were studied. Further, The effects of temperature was studied. The results showed that the apparent activation energys for induction phase was 76.54 kJ/mol. There is a liner relationship between induction time and the concentration of potassium iodate with range of 8.3 × 10^-5-1.2× 10^-3 mol/L. And the regression equation are as follows： tin=4.2×10^2-2.5×10^5 [IO^3-]（R=0.995）with a detection limit of 2.8×10^-5 mol/L. The concentration of iodate ion is determined in the oscillating reaction system with satisfing results, which provides a new method for detecting iodine in dark tea.