A Miniature Electronic Nose for Breath Analysis

Li, Zhaofang; Sie, Syuan-Hao; Lee, Jye-Luen; Chen, Yiren; Chou, Ting-I; Wu, Ping-Chun; Chuang, Yu-Ting; Lin, Yu‐Te; Chen, I-Cherng; Lu, Chih‐Cheng; Juang, Ying‐Zong; Chiu, Shih-Wen; Hsieh, Chih-Cheng; Chang, Meng‐Fan; Tang, Kea-Tiong

doi:10.1109/iedm19574.2021.9720693

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…Metal oxide semiconductor (MOS) gas sensors have been widely utilized in military, scientific research and various industries due to their unique advantages, such as a small size, low power consumption, high sensitivity, and compatibility with silicon chips [44]. Electronic nose systems employ sensor arrays with different surface chemical properties; increasing the number of sensor arrays can extract more "features" of volatile organic compound (VOC) molecules and provide a "manyto-one" or "many-to-many" method to differentiate VOC gas molecules through pattern recognition/machine learning algorithms [45][46][47][48]. Gonzalez combined electronic nose technology with machine learning to achieve artificial intelligence based on a low-cost sensor network [49].…”

Section: Discussionmentioning

confidence: 99%

Identification and Distribution Characteristics of Odorous Compounds in Sediments of a Shallow Water Reservoir

Wang,

Zhu,

Wang

et al. 2024

Water

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Odorous sediments containing volatile organic sulfur compounds (VOSCs) are a common issue in shallow water reservoirs globally. Volatile organic sulfur compounds are a typical class of malodorous substances that have attracted widespread attention due to their pungent odors and extremely low odor thresholds. The insufficient hydrodynamic conditions in the reservoir area lead to the accumulation of pollutants in the sediment, where biochemical reactions occur at the sediment–water interface, serving as a significant source of foul-smelling substances in the water body. This study analyzed sediment samples from 10 locations across a shallow water reservoir using flavor profile analysis, an electronic nose, and gas chromatography-mass spectrometry. The predominant odor types were earthy/musty and putrid/septic, with key odorants being VOSCs, 2-methylisoborneol, and geosmin. The results revealed VOSCs from organic matter account for up to 96.7% of odor activity. More importantly, concentrations and release fluxes of VOSCs consistently decrease along the water flow direction from dam regions to tail regions. This trend matches organic matter accumulation patterns in shallow reservoirs and highlights dam areas as hotspots for malodorous sediment. The generalized spatial distribution pattern and identification of key malodorous compounds establish a basis for understanding and managing odor issues in shallow freshwater reservoir sediments.

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