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• W3107366936 abstract "A sensitive and fast method for simultaneous determination of gaseous ammonia (NH3) and particulate ammonium (NH4+) in ambient air is presented. NH3 is sampled in a cylindrical wet effluent diffusion denuder (CWEDD) and analyzed online by a continuous flow system with a fluorescence detector (FLD), while NH4+ bound to aerosol particles is sampled in parallel by a condensation growth unit—the aerosol counterflow two-jet unit (CGU-ACTJU) sampler—and analyzed online with another FLD. The sensitive fluorescence detection of ammonium in concentrates of the CWEDD and the ACTJU is based on its reaction with ortho-phthaldialdehyde and sulfite to form isoindol-1-sulfonate. The calibration curve of ammonium is linear in the concentration range of 5 × 10–9 to 2 × 10–6 M. The limit of detection (LOD = 3 s/n) values of NH3 and NH4+ are 3.52 ng m–3 (5.05 ppt) and 1.04 ng m–3, respectively. The developed method enables online measuring of distribution of NH3/NH4+ in ambient air with a time resolution of 1 s. The optimized method was used for the determination of NH3/NH4+ in urban air in Brno in two campaigns during the winter and summer of 2018. The results obtained by the developed method were compared with a reference method based on the sampling on filters and “dry” diffusion denuders coated by phosphoric acid." @default.
• W3107366936 created "2020-12-07" @default.
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• W3107366936 date "2020-11-25" @default.
• W3107366936 modified "2023-10-01" @default.
• W3107366936 title "Simultaneous Determination of Gaseous Ammonia and Particulate Ammonium in Ambient Air Using a Cylindrical Wet Effluent Diffusion Denuder and a Continuous Aerosol Sampler" @default.
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• W3107366936 doi "https://doi.org/10.1021/acs.analchem.0c03037" @default.
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