Abstract
An ion mobility spectrometry system was deployed during a field experiment to measure ambient ammonia (NH 3). A dual-cell AirSentry ion mobility spectrometer (ASIMS) was utilized to measure ambient NH 3 in suburban Tampa, FL from 1 to 16 October 2003. Statistical analysis of half-hourly averaged data showed that the concentration distribution was bimodal. The vicinity of the first mode of the data set had a mean and standard error of 1.4±0.1 ppb, which was ascribed to background levels of NH 3, while the mean concentration of the second mode, 3.5±0.1 ppb, probably represented the contribution from local emission sources. Joint frequency distributions of NH 3 concentration and 16 wind direction sectors were developed into pollution roses. The largest joint frequency values were from the NNW through NE sectors as well as the SW and SE sectors. Spikes in NH 3 concentrations were observed in winds emanating from the N, NNE, S, and NW sectors. A comparison of a cumulative pollution rose and a map of known NH 3 emitters in the vicinity of the sampling site showed a direct relationship between winds emanating from the sectors where fertilizer manufacturing facilities were located and high NH 3 concentrations.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
