采样条件对室内甲醛检测结果的影响

Effect of Different Sampling Conditions on Content of Formaldehyde Detection in Indoor Air

论文研究了封闭时间、采样流量、采样时间、采样温度和采样高度5个条件对室内甲醛检测结果的影响。选择采样的地点分别为某装修公司样板房、某酒店公寓、办公室、学生宿舍和实验室以及甲醛污染模拟室。采用的检测方法为酚试剂分光光度法。结果表明:(1)封闭时间的前2 h内,室内甲醛含量增加较快,对低甲醛污染房间和高浓度甲醛污染,分别在封闭的2和4 h后达稳定状态;(2)采样流速以0.5 L/min为宜,对于污染较低的房间,可适当提高采样流速;(3)采样时间宜控制在15~30 min内,可满足测试的要求;(4)采样环境温度升高,检测值增大;(5)甲醛在室内有一定空间分布差异,采样高度为1.2 m时,检测值最高。

This paper studied five factors(closed time,sampling flow,sampling time,sampling temperature,and height of sampling,) which influence the determination of formaldehyde in the indoor air.A newly renovated room,a service apartment,an office,a dormitory and a laboratory were chosen as study sites.Phenol reagent spectrophotometry method was used as the detection method.The results showed that:(1) In the first 2 h of the sealing time,the indoor formaldehyde content increased rapidly,and reached a stable state for low formaldehyde pollution rooms and high formaldehyde pollution after sealing for 2 and 4 h,respectively;(2)The sampling flow rate should be at 0.5 L·min-1,and the sampling flow rate can be appropriately increased for rooms with low pollution;(3)The sampling time should be controlled within 15~30 min to meet the test requirements;(3) The detection value increases with the increase of sampling environment temperature;(4)Formaldehyde has a certain spatial distribution difference in the room.When the sampling height was at 1.2 m,the detection value was the highest.