酚试剂分光光度法测定空气中微量甲醛含量影响因素分析

Analysis of Trace Formaldehyde Detection in the Air with Mbth Spectreophotom Etry

目的改进GB／T18204．26《公共场所空气中甲醛测定方法》中的酚试剂分光光度法测定空气中甲醛含量影响条件。方法对显色温度和显色时间、入射光波长及显色剂酸度等几个方面进行了分析。结果该方法检出限为0．058μg／5mL，线性范围0．1～2．0μg／SmL，加标回收率93％～97％。结论该方法精密度高、准确性好，简单、快速，可用于空气中甲醛含量的测定。

Objective To adjust the influencing factors in the ＂MBTH Spectreophotom etry method for determination of formaldehyde in the air＂（GB/T 18204.26）. Methods Analysis the experiment on color development temperature and reaction time;absorption wave length and the acidity of color development reaction. Results The detection limit is 0. 058μg/5mL,the linear range is 0.1～2.0μg/5mL,and covery efficiency varied from 93%～97%. Conclusion The method could meet the precisionand accuracy of the detection,It is simple.and rapid and it is suitable for determining trace formaldehyde in the air.