||In this study, atmospheric ammonia was sampled passively to explore the spatiotemporal distribution of ammonia concentration in the atmosphere of a science park and to analyze the potential sources of ammonia in the science park. There is very few investigation on the ammonia measurement in the science park. High-tech industrial area is a key monitoring area, thus it is necessary to conduct the monitoring of atmospheric ammonia in this area for the improvement of domestic science. The all-weather, air-monitoring data of the scientific park is used to identify the potential sources of ammonia emissions to the atmosphere in this area. Finally, the results of this study are compared with the ammonia concentration in the atmosphere of various regions in the world.|
An Ogawa passive sampler, which has been widely applied around the world, was used in conjunction with the Ogawa PS-154 NH3 collection coating gasket for ammonia measurement performing long-term continuous ammonia concentration. At the same time, the ammonia concentration data in the sampling program of the environmental quality of the science park was collected, which was mainly monitored by the indophenol spectrophotometer method. During the sampling period, the passive sampling method showed that the atmospheric ammonia concentrations in the region were ordered as west side (24.44±19.61 ppb)> east side (18.01±13.12 ppb)> south side (16.96±10.11 ppb)> north side (9.64±11.40 ppb). After deleting the rainfall data, the concentration of ammonia in the region was then compared with the indophenol spectrophotometer. Similar trend was observed between the two sampling methods. The major difference was mainly caused by the sampling period. Passive sampling was conducted continuously and covered daytime and nighttime, while the indophenol spectrophotometer method was mainly conducted manually only in the daytime in an interval of six days.
For analyzing the potential sources of ammonia in this area, both sampling methods showed that the ammonia in the atmosphere of the region was local sources while compared with the weather meteorological factors. It indicated that the major sources were anthropogenic emissions. The sources of ammonia were dominated by stationary sources instead of natural sources, concurring with the characteristics of the science park. Finally, the influences of meteorological factors on atmospheric ammonia concentration in the region was also investigated.