【摘要】 基于在稀磷酸介质中亚硝酸根对溴酸钾氧化甲基紫的反应具有明显的催化作用 ,应用自制的甲基紫选择性电极跟踪反应液中甲基紫浓度的变化 ,建立了一种测定亚硝酸根的催化电位新方法。该方法在室温下进行 ,操作方便 ,样品溶液不受颜色限制。在选择的最佳条件下 ,检出限为 7 6× 1 0 -7g/L ,线性范围为8 0× 1 0 -7～ 8.0× 1 0 -5g/L。用于肉制品中亚硝酸根含量的测定 ,结果满意更多还原

【Abstract】 A new catalytic potentiometric method for determining trace nitrite has been developed. It is based on the catalytic effect of trace nitrite on the oxidation of methyl violet by potassium bromate. Methyl violet ion selective electrode was used to indicate the change of the concentration of methyl violet in the reaction solution. This method is operated in the room temperature and without disturbance of sample colour. The optimum experiment conditions for the determination was studied. The detection limit for nitrite is 7.6×10 -7 g/L , the linear range of the determination is 8.0×10 -7 ～8.0×10 -5 g/L.The method has been used to determine trace nitrite in ham with satisfactory results.更多还原