A new method for measuring ambient 1,3-butadiene through active DOAS

As one of highly reactive dialkenes, 1,3-butadiene (BD) plays a significant role in the atmospheric radical cycle. We have introduced a novel method for the online measurement of ambient BD using the Differential Optical Absorption Spectroscopy (DOAS) technique. During lab testing, the correlation coefficient (R²) between measured BD concentrations and standard concentrations consistently exceeded 0.9999. The accuracy and precision were within ± 5% and 1%, respectively. Interference testing demonstrated that DOAS can effectively distinguish between substances and accurately fit BD concentrations. Following field measurement, the detection limit for BD reached 90 pptv, the R² between DOAS and the online VOCs system results reaches 0.85, with a slope of 0.86. With its minute-level temporal resolution and cost-effectiveness, DOAS is suitable for long-term BD measurements and has been further validated as an effective method to provide valuable data support for in-depth investigations into the atmospheric oxidation processes of BD.

This work was supported by Sino-German Mobility Program (M-0509) and National Natural Science Foundation of China (grant number 42075097, 22176037, 42375089, 22376030).