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System for dosing formaldehyde vapor at the ppb level

机译：ppb级定量甲醛蒸气的系统

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摘要

Formaldehyde is one of the most relevant compounds for indoor air pollution. It is toxic, allergenic and carcinogenic and acts already at the ppb level. State-of-the-art detection methods are based on the wet chemical analysis of formaldehyde derivates. This is a complex and time-consuming approach and hinders the collection of real-time data. However, the use of wet chemistry allows for the simple calibration based on formalin solutions. By using gas sensors, online monitoring of indoor air quality is, in principle, possible. To find out whether their performance is good enough, calibration is the first issue to be resolved. Formaldehyde vapor at low concentrations has to be used, and temperature, humidity and flow rate have to be kept constant. This paper discusses the different possibilities of dosing formaldehyde and how to better meet the gas sensor calibration demands. The authors favor the use of an aqueous formaldehyde solution obtained by the depolymerization of paraformaldehyde in combination with a permeation tube used as external reference. Moreover, in the paper it is demonstrated that metal oxide sensors are appropriate detectors to calibrate the system for concentrations even down to 20 ppb. Consequently, the presented system is able to characterize gas sensors and can be used for the development of new devices which monitor indoor air quality.
机译：甲醛是与室内空气污染最相关的化合物之一。它具有毒性，致敏性和致癌性，并且已经达到ppb的水平。最先进的检测方法是基于甲醛衍生物的湿化学分析。这是一种复杂且耗时的方法，并且阻碍了实时数据的收集。然而，湿化学的使用允许基于福尔马林溶液的简单校准。通过使用气体传感器，原则上可以在线监测室内空气质量。为了确定其性能是否足够好，校准是要解决的第一个问题。必须使用低浓度的甲醛蒸气，并且温度，湿度和流速必须保持恒定。本文讨论了添加甲醛的不同可能性以及如何更好地满足气体传感器校准要求。作者赞成使用通过将低聚甲醛解聚获得的甲醛水溶液与用作外部参照物的渗透管结合使用。此外，在论文中证明了金属氧化物传感器是合适的检测器，可以校准系统甚至低至20 ppb的浓度。因此，提出的系统能够表征气体传感器，并可用于开发监测室内空气质量的新设备。

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