Development of a broadband cavity-enhanced absorption spectrometer for simultaneous measurements of ambient NO3, NO2, and H2O DOI Creative Commons
Woohui Nam, Changmin Cho, Begie Perdigones

et al.

Published: April 11, 2022

Abstract. We describe the characteristics and performances of our newly built broadband cavity-enhanced absorption spectrometer for measurements nitrate radical (NO3), nitrogen dioxide (NO2), water vapor (H2O). A customized vibration-resistance cavity layout incorporated with N2 purging on high-reflection mirror surfaces was implemented a red light-emitting diode (LED) as light source. In general, this system achieved over 40 km (up to 101.5 km) effective path length at 662 nm from 0.52 m long cavity. For accurate NO3 measurement, measured spectrum H2O used simultaneous concentration retrievals other species, instead being treated interferences be removed or corrected prior detection. Synthesized N2O5 crystals under atmospheric pressure were performance tests linear response transmission efficiency. From standard injection experiments NO3, NO2, H2O, high linearities observed (R2 ≥0.9918). The total efficiency through determined 81.2 % (±2.9, 1σ) within residence time 2.59 seconds. precisions (1σ) in 1 Hz measurement single pixel CCD 1.41 pptv, 6.92 ppbv, 35.0 ppmv uncertainties 10.8, 5.2, ≥20.5 %, respectively, mainly errors literature cross-sections. instrument successfully deployed aboard Korean icebreaker R/V Araon an expedition conducted remote marine boundary layer Arctic Ocean during summer 2021.

Language: Английский

Midinfrared Cavity-Enhanced Two-Photon Absorption Spectroscopy for Selective Detection of Trace Gases DOI

Yu-Zhong Liu,

Mu-Fan Yu,

Yan-Dong Tan

et al.

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

Detection of trace gases, such as radioactive carbon dioxide, clumped isotopes, and reactive radicals, is great interest poses significant challenges in various fields. Achieving both high selectivity sensitivity essential this context. We present a highly selective molecular spectroscopy method based on comb-locked, mid-infrared, cavity-enhanced, two-photon absorption. The Doppler-free nature transitions considerably reduces the width resonance, which improves avoids interference due to nearby from other molecules. high-finesse optical cavity increases laser power by thousands times compensates for small cross-section transition. quantitative capability demonstrated measuring

Language: Английский

Citations

2
Perovskite-Structured NiTiO3 Modified NiO Gas Sensor for Xylene Detection DOI Creative Commons
Liyun Qin, Hongliang Gao, Fanli Meng

et al.

Chemosensors, Journal Year: 2023, Volume and Issue: 11(5), P. 264 - 264

Published: April 29, 2023

Xylene gas is highly toxic, can irritate the skin, and also very harmful to body. Therefore, it necessary prepare sensors that accurately detect xylene. In this paper, NiTiO3 nanoparticles were synthesized by hydrothermal method used modify NiO, a NiTiO3-modified NiO (NiTiO3-NiO) nanosheet material was successfully prepared. Its microstructure internal composition observed analyzed various characterization methods. When detecting 100 ppm xylene at optimum temperature, comparing response level of NiTiO3-NiO sensor with pure nickel oxide sensor, former 20 times latter, sensitivity greatly improved. environment, reached 21, minimum detection limit 1 ppm, recovery time 135.75 s. perovskite-structured material, many active sites good catalytic properties promote redox reactions.

Language: Английский

Citations

18
Varying annealing temperature to enhance xylene vapor sensing performance of CuFe2O4 nanoparticles prepared by solvothermal method DOI
Meihua Li, Xiao Li,

Shikun Ge

et al.

Vacuum, Journal Year: 2024, Volume and Issue: 223, P. 113096 - 113096

Published: March 5, 2024

Language: Английский

Citations

4
Review: Advances in efficient separation of paraxylene from mixed xylene isomers using SMB technology and MOF materials DOI
Dongyun Han,

ShiJie Wu,

Z.H. Xia

et al.

Journal of Industrial and Engineering Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

Citations

0
VOCs absorption using ionic liquids DOI

Yunlong Wang,

Rongshan Bi,

Jijun Ge

et al.

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 132265 - 132265

Published: Feb. 1, 2025

Citations

0
Assessing Effect of Toluene on Immobilized Denitrifying Microorganisms: Enzyme Activity, Electronic Behavior, and Microbial Community DOI
Kai Wu, Chenxi Li, Nengsheng Liu

et al.

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 116284 - 116284

Published: March 1, 2025

Language: Английский

Citations

0
Deep-ultraviolet absorption cross sections of strongly absorbing atmospheric species DOI Creative Commons
Meng Wang,

Sean C. Connolly,

Dean S. Venables

et al.

Journal of Quantitative Spectroscopy and Radiative Transfer, Journal Year: 2024, Volume and Issue: 323, P. 109050 - 109050

Published: May 15, 2024

Absorption of deep-ultraviolet photons gives rise to intense vibronic transitions in molecules and can be exploited for sensitive selective quantification trace gases. Accurate absorption cross sections at appropriate resolution are essential such applications, but not well characterised even major atmospheric species like nitric oxide (NO) key biogenic anthropogenic volatile organic compounds (BVOCs AVOCs). This study reports new section spectra from 197 235 nm NO 1 atm 293 K important aromatic AVOCs (benzene, toluene, ethylbenzene, o-, m-, p-xylene) BVOCs (α-pinene, β-pinene, limonene, 3-carene, myrcene) across a temperature range 296 K. Measurements were made with xenon flashlamp spectrometer using flow cell configuration gas mixtures static arrangement vapor-phase VOC samples. The the spectrum 253.7 was approximately 0.3 nm. Both configurations showed excellent agreement magnitude spectral features well-established literature sections. Flow measurements validated against sulfur dioxide (SO2) that isoprene. Our m-xylene reconcile large differences structure previous deep-UV myrcene ethylbenzene reported first time, confirmed α-pinene, limonene. We discuss potential challenges quantifying these gases ambient air monitoring, emissions breath analysis.

Language: Английский

Citations

2
Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) DOI Creative Commons
Ryan Thalman,

Nitish Bhardwaj,

Callum E. Flowerday

et al.

Sensors, Journal Year: 2022, Volume and Issue: 22(7), P. 2626 - 2626

Published: March 29, 2022

Sulfur dioxide (SO2) is an important precursor for the formation of atmospheric sulfate aerosol and acid rain. We present instrument using Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) measurement SO2 with a minimum limit detection 0.75 ppbv (3-σ) spectral range 305.5-312 nm averaging time 5 min. The consists high-reflectivity mirrors (0.9985 at 310 nm) deep UV light source (Light Emitting Diode). effective absorption path length 610 m 0.966 base length. Published reference cross sections were used to fit retrieve concentrations compared fluorescence standard measurements SO2. comparison was well correlated, R2 = 0.9998 correlation slope 1.04. Interferences tested BBCEAS showed no interference, while ambient responded similarly techniques.

Language: Английский

Citations

8
Volatile organic compounds (VOCs) emission interferes with real-time regulatory monitoring of ozone in urban atmosphere DOI
Xiaoguang Wang, Ke Hu,

Yanfen Hao

et al.

Urban Climate, Journal Year: 2024, Volume and Issue: 55, P. 101938 - 101938

Published: April 21, 2024

Language: Английский

Citations

1
Intercomparison of NO3 under Humid Conditions with Open-Path and Extractive IBBCEAS in an Atmospheric Reaction Chamber DOI Creative Commons
Meng Wang, Shengrong Lou, Weiwei Hu

et al.

Remote Sensing, Journal Year: 2023, Volume and Issue: 15(3), P. 739 - 739

Published: Jan. 27, 2023

We report an open-path incoherent broadband cavity-enhanced absorption spectroscopy (OP-IBBCEAS) technique for in situ simultaneous optical monitoring of NO2, NO3, and H2O a reaction chamber. The measurement precision values (1σ) are 2.9 ppbv pptv NO2 NO3 2 s, respectively, the uncertainties 6% 14% NO3. Intercomparison measured concentrations by extractive IBBCEAS was carried out SAES-ARC chamber during with O3. accuracy OP-IBBCEAS is verified intercomparison transmission efficiency determined comparison against measurement. relationship between cross section its mixing ratio at 295 K 1 atm analysed. Due to spectral resolution system, strong narrow lines unresolved exhibit non-Beer–Lambert Law behaviour. Therefore, correction method used obtain effective fitting structure. An inappropriate can cause overestimation concentration about 28% humid atmosphere (H2O = 1.8%). This spectroscopic provides approach accurate configurations, example experiments or field campaigns. improved factor 3 4 after applying Kalam filtering, achieving sub-ppbv (0.8 ppbv) sub-pptv (0.9 pptv) performance s respectively.

Language: Английский

Citations

3