【摘要】 对目前我国大气监测中推荐的测定甲醛的酚试剂法和乙酰丙酮法作了改进,酚试剂法将反应时间30min改为80min,乙酰丙酮法将在室温下反应120min改为在70℃水浴中反应5min。干扰实验表明,其他醛类对乙酰丙酮法测甲醛无干扰,所测结果为甲醛,酚试剂法所测结果不仅为甲醛同时还有乙醛等其他醛类,因此可用它代表总醛。更多还原

【Abstract】 Two spectrophotometric methods (MBTH method and Acetyl Acetone method) for rhe determination of formaldehyde (HCHO) and total aldehyde (TCHO) have been studied and optimized for the analysis of the ambient air in Beijing. Results show that time and temperature of color reaction are the major factors which influence obviously the completeness of the reaction. To get the best results, experimental conditions if the reaction time was changed from 30 min to 80 min at room temperature for MBTH method and from 120 min at room temperature to 5 min at 70℃ for Acetyl Acetone method. Other aldehyde is not detected by Acetyl Acetone method, which is natually specific for Formaldehyde. Hovewer MBTH method can be used for the determination of formaldehyde and other aldehyde as well, and the results were expressed in the concentration of formaldehyde equivalents.更多还原