Field Intercomparison with Five Automatic Ammonia Monitors

摘要

A field intercomparison with automatic ammonia monitors was held in Bilthoven,The Netherlands, for a period of two weeks. Six instruments were continuously and simultaneously operated to measure the ammonia concentration in ambient air. During the intercomparison these instruments were studied with respect to their performance and potential suitability as a monitor for the National Air Quality Monitoring Network (NAQMN) of the Netherlands. The instruments were a continuous-flow denuder, two thermodenuders, a commercial Differential Optical Absorption Spectrometry (DOAS) system of OPSIS, a photoacoustic monitor, and a (non-automatic) Annular Denuder System, used as a reference. With the latter method ammonium concentrations were also measured.