AHMT分光光废法检测甲醛浓度的影响因素

摘要

AHMT spectrophotometry is a common method for the determination of formaldehyde in indoor air.First,4-amino-3-diazo-5-rosin-1,2,4-triazolam(AHMT) condensation with formaldehyde in alkaline conditions;and then the reaction product oxidized by potassium periodate to purplish red compounds;finally,the concentration of formaldehyde was calculated by the absorbance of the system.In this paper,the amount of reagent,the time of oxidation,the concentration of potassium hydroxide,the amount of oxidant and the reaction temperature effects of the detection results were analyzed,and the best experimental conditions of AHMT spectrophotometry were determined by the analysis results.%AHMT分光光度法是检测室内空气中甲醛浓度的常用方法.首先,4-氨基-3-联氮-5-琉基-l,2,4-三氮杂茂(AHMT)在碱性条件下与甲醛进行缩合反应;然后用KIO3将反应产物氧化成紫红色化合物;最后通过体系的吸光度来计算定量甲醛的浓度.本文研究分析了显色剂用量、氧化时间、KOH的浓度、氧化剂用量、显色反应温度等因素对检测结果所造成的影响,并通过分析结果确定AHMT分光光度法的最佳实验条件.