【摘要】 实验中发现 ,在 p H=8.0的磷酸缓冲溶液介质中 ,SO2 - 3能迅速还原孔雀绿褪色 ,甲醛对该褪色反应具有强的抑制作用 ,氯化十六烷基吡啶对该体系有明显的增敏效应 ,同时还能进一步增强甲醛的抑制作用。研究了最佳条件 ,考察了共存物质的影响 ,建立了抑制动力学流动注射分光光度测定甲醛的新方法。方法的线性范围为0 .0 5 5～ 3.0 0 μg/m L,检出限 0 .0 1 8μg/m L,不需要特殊的试剂 ,用于饮料中甲醛的测定 ,结果满意更多还原

【Abstract】 In pH=8.0 phosphate buffer solution, formaldehyde has inhibitory effect on the fading reaction between SO 2- 3and malachite green. The micellar of cetylpyridine chloride can enhance the the absorbency and the inhibitory effect of formaldehyde. Base on this, we developed a new FI photometric method for formaldehyde. The method allowed the determination of foraldehyde in the range 0.055~3.0 μg/mL. The new method was applied to the determination of formaldehyde in beverage with satisfactory results.更多还原