A New Portable Instrument for Online Measurements of Formaldehyde: From Ambient to Mobile Emission Sources

• DOI: 10.1021/acs.estlett.0c00169
• Publication Date: 2020-04-20T13:35:45Z
• Authors: Manni Zhu; Huabin Dong; Fei Yu; Songdi Liao; Yan Xie; Junwen Liu; Qinge Sha; Zhuangmin Zhong; Limin Zeng; Junyu Zheng
• Keywords: 13. Climate action; 01 natural sciences; 0105 earth and related environmental sciences

Formaldehyde (HCHO) plays an important role in atmospheric photochemistry, HOx budget, and ozone formation. Several instruments have been developed for measuring ambient HCHO, yet few targeted primary emission sources due to their very high HCHO levels complex conditions. Here, we present a novel portable instrument, the Hantzsch-Abs, based on Hantzsch reaction absorption photometry, which is specifically designed online continuous measurement of concentrations both environment from vehicle exhaust. The Hantzsch-Abs features adjustable liquid waveguide capillary cell (LWCC), displaying sensitivity strong flexibility detection. limit detection 50 cm LWCC was 25 pptv; range could be adjusted up approximately 3 ppmv. A field comparison with commercially available indicated that sufficiently robust monitoring concentrations. Furthermore, instrument capable capturing dynamic patterns emissions vehicles under chassis dynamometer on-road tests, suggests potential applications emissions. Our experimental data are strongly correlated driving conditions current characteristics likely require systematic updating.