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Formaldehyde atmospheric measurement instrument meets the needs of atmospheric formaldehyde field observation

2022-03-08

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Many people are familiar with the term formaldehyde, especially the claim that it is carcinogenic, leading many to avoid it. Formaldehyde is a colorless, pungent gas with reducing properties; it is combustible and also known as formic aldehyde. A 40% aqueous solution is called formalin, which is commonly heard of.

Many formaldehyde detectors are available on the market for detecting formaldehyde concentrations in homes, factories, and other places, or for detecting formaldehyde content in food and water, such as formaldehyde gas detectors, water formaldehyde detectors, formaldehyde component detectors, and food formaldehyde detectors. These instruments provide technological support to help us avoid formaldehyde harm.

In addition, formaldehyde is an important intermediate in the oxidation degradation process of volatile organic compounds (VOCs) in the atmosphere, playing an important role in ozone formation and the HOx-NOx radical chain cycle in atmospheric pollution chemistry. In environmental pollution research, in-situ observations of formaldehyde concentration can serve as an important indicator to distinguish between anthropogenic and biogenic VOCs, and can be used for model validation.

Direct and accurate measurement of formaldehyde is of great significance to atmospheric chemical research and pollution control. China has also conducted much research on atmospheric formaldehyde detection. Recently, Zhang Weijun's research group at the Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made new progress in atmospheric formaldehyde detection, bringing new possibilities to China's atmospheric formaldehyde detection.

It is understood that researcher Zhao Weixiong and Dr. Fang Bo, members of the research group, designed a new type of spherical mirror multi-pass cell, obtaining an effective absorption optical path of 96 m under a 36 cm base length. Combined with the use of a 3.5 μm interband cascade laser (ICL), they independently developed an atmospheric formaldehyde measuring instrument based on tunable diode laser absorption spectroscopy (TDLAS) technology. This atmospheric formaldehyde measuring instrument achieves a detection limit of 51 pptv (10 s, 1σ), which can meet the urgent needs of atmospheric formaldehyde field observations.

Currently, this instrument has performed well in the large-scale comprehensive field observation experiment in the Guangdong-Hong Kong-Macao Greater Bay Area in the autumn of 2018, providing high-quality data support for the observation.

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