title: Locating sources of hazardous gas emissions using dual pollution rose plots and open path Fourier transform infrared spectroscopy.
abstract: A new approach employing two pollution rose plots to locate the sources of multiple hazardous gas emissions was proposed and tested in an industrial area. The data used for constructing the pollution rose plots were obtained from two side-by-side measurements of open-path Fourier Transform Infrared (OP-FTIR) spectrometers during one week of continuous analysis on the rooftop of a semiconductor plant. Hazardous gases such as CF4, C2F6, CH3OH, NH3, NO2, and SF6 were found and quantified at the ppb level by both OP-FTIR measurement sites. The data of the top 20% highest concentrations and associated wind directions were used to construct the pollution rose plots. Pollution source probability contours for each compound were constructed using the probability-product of directional probability from two pollution rose plots. Hot spots for SF6, CF4, NO2, and C2F6 pointed to the stack area of the plant, but the sources of CH3OH and NH3 were found outside of this plant. The influences of parameters for this approach such as the variation in wind direction, lower limit concentration threshold and the nearby buildings were discussed.
authors: Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan; Industrial Technology Research Institute, Hsin-Chu 30011, Taiwan.
authors: Lung-Yu
authors: LY
authors: Sung
authors: Industrial Technology Research Institute, Hsin-Chu 30011, Taiwan.
authors: Ruei-Hou
authors: RH
authors: Shie
authors: Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan. Electronic address: cjlu@ntnu.edu.tw.
authors: Chia-Jung
authors: CJ
authors: Lu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D005740:Gases / Q000032:analysis; D015386:Hazardous Substances / Q000032:analysis*; D012666:Semiconductors; D017550:Spectroscopy, Fourier Transform Infrared; D014919:Wind
chemical_list: D000393:Air Pollutants; D005740:Gases; D015386:Hazardous Substances
keywords: Emission source; Hazardous gases; Open-path FTIR; Pollution rose plot