Dr. Jun Duan Profile

Dr. Jun Duan

at CAS

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Proceedings Article | 4 December 2024 Paper

Application of spectroscopy technology in detecting toxic effects of environmental pollutants

Mudi Wang, Xinyi Wang, Qiming Xia, Mengke Liu, Zhonghao Chen, Hongdi Zhan, Rui Ma, Jun Duan

Proceedings Volume 13283, 132832P (2024) https://doi.org/10.1117/12.3036883

KEYWORDS: Spectroscopy, Proteins, Infrared spectroscopy, Raman spectroscopy, Fluorescence spectroscopy, Vibration, FT-IR spectroscopy, Chemical analysis

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Due to the swift progress of industrialisation and urbanisation, the issue of environmental pollution has escalated significantly, presenting a significant peril to human well-being and the ecology. The identification of harmful impacts caused by environmental contaminants is highly important for evaluating environmental hazards, developing measures to reduce pollution, and safeguarding public health. Spectroscopic techniques offer a potent means of environmental monitoring because to their exceptional sensitivity, quick response, and non-destructive detection capabilities. This article provides an overview of the basic principles and categorisations of spectroscopic methods, such as ultraviolet-visible spectroscopy, fluorescence spectroscopy, infrared spectroscopy, and Raman spectroscopy. It delves into the specific uses of these techniques in identifying particular contaminants in water, soil, and the atmosphere. The article centres around the capacity of spectroscopic techniques to detect and measure environmental contaminants, particularly biotoxic contaminants such as heavy metals, organic pollutants, and bacteria. A comparative analysis reveals the superiority of spectroscopic approaches over traditional chemical analytical methods in terms of sensitivity, detection limits, ease of operation, and cost-effectiveness.

Proceedings Article | 18 March 2021 Paper

Measurements of glyoxal using broadband cavity-enhanced absorption spectrometer on mobile platforms in Hefei

Jun Duan, Helu Zhang, Pinhua Xie, Wenqing Liu

Proceedings Volume 11780, 1178011 (2021) https://doi.org/10.1117/12.2590031

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Glyoxal is one of the most important volatile organic compounds in the atmosphere and the tracer of the photochemical oxidation process of VOCs, which can effectively reflect the emission level and reactivity of atmospheric VOCs. Due to the very low concentration of glyoxal, general measurement technology is difficult to accurately and fast detect glyoxal. Here, we reported a self-designed broadband cavity-enhanced absorption spectrometer (BBCEAS) on mobile platforms for measurements of atmospheric glyoxal, and for 30 seconds averaged data the average detection limits (2σ) for glyoxal was about 0.024 ppb. To measure the spatial distribution of glyoxal, the BBCEAS instrument was deployed in a car and gas was draw into the BBCEAS instrument through an inlet fixed on the roof of the car. The spatial distribution of glyoxal in Hefei was measured on Sep 8th , 2020, the measured glyoxal concentrations ranged from 0.010 ppb to 0.258 ppb. The results demonstrated that the BBCEAS instrument has overcome the effect of vibrations for the measurements on mobile platforms and can get the spatial distribution of glyoxal.

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