Simultaneous absolute measurements of gaseous nitrogen species in urban ambient air by long pathlength infrared and ultraviolet-visible spectroscopy |
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| Institution: | 1. Department of Trauma and Orthopaedic Surgery, Whiston Hospital, Prescot, UK;2. University of Nicosia Medical School, Cyprus;1. Qingdao Engineering Laboratory of Single Cell Oil, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China;2. Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China;3. Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China;4. University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | Two new long pathlength spectrometers, utilizing 25-m basepath multiple reflection optical systems, were employed for the first time during an intercomparison of measurement methods for atmospheric nitrogenous species held at Claremont, CA, 11–19 September 1985. Measurement of nitrogenous species using these closed optical path systems, as opposed to single pass systems extending several kilometers, permit the resulting in situ absolute spectroscopic data to serve as benchmark values for point monitors employing denuders or filter packs. The FT-IR spectrometer was operated at a total pathlength of 1150 m and spectral resolution of 0.125 cm−1, with corresponding detection sensitivities of 160 nmolem−3 for HNO3 and 60 nmole m−3 for NH3 (4 and 1.5 ppb, respectively). Concurrent measurements of HONO, NO2 and NO3 radicals were conducted with the differential optical absorption spectrometer operated at 800 m total pathlength with detection limits of 24, 160 and 0.8 nmole m−3 (0.6, 4 and 0.02 ppb) for HONO, NO2, and NO3 radicals, respectively. |
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