NTT Energy and Environment Systems Laboratories, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan.
Anal Chim Acta. 2011 Sep 30;702(2):247-53. doi: 10.1016/j.aca.2011.06.050. Epub 2011 Jul 5.
We have developed a portable device for formaldehyde monitoring with both high sensitivity and high temporal resolution, and carried out indoor air formaldehyde concentration analysis. The absorbance difference of the sensor element was measured in the monitoring device at regular intervals of, for example, one hour or 30 min, and the result was converted into the formaldehyde concentration. This was possible because we found that the lutidine derivative that was formed as a yellow product of the reaction between 1-phenyl-1,3-butandione and formaldehyde was stable in porous glass for at least six months. We estimated the reaction rate and to be 0.049 min(-1) and the reaction occurred quickly enough for us to monitor hourly changes in the formaldehyde concentration. The detection limit was 5 μg m(-3) h. We achieved hourly formaldehyde monitoring using the developed device under several indoor conditions, and estimated the air exchange rate and formaldehyde adsorption rate, which we adopted as a new term in the mass balance equation for formaldehyde, in one office.
我们开发了一种具有高灵敏度和高时间分辨率的便携式甲醛监测仪，并进行了室内空气甲醛浓度分析。监测仪每隔例如一小时或 30 分钟就会测量传感器元件的吸光度差，并将结果转换为甲醛浓度。之所以能够实现这一点，是因为我们发现 1-苯基-1,3-丁二酮与甲醛反应生成的咯啶衍生物在多孔玻璃中至少稳定六个月。我们估计反应速率为 0.049 min(-1)，并且反应足够快，我们可以监测甲醛浓度的每小时变化。检测限为 5 μg m(-3) h。我们在几个室内条件下使用开发的设备实现了每小时的甲醛监测，并在一个办公室中估计了空气交换率和甲醛吸附率，我们将其作为甲醛质量平衡方程中的一个新术语。
