암모니아 공간분포 조사를 위한 Passive Sampler 개발에 관한 연구

A Study on the Development of Passive Sampler for Ammonia Spatial Distribution Survey

Passive and active samplers are widely deployed for measuring gaseous pollutants such as nitrogen dioxide, sulfur dioxide and ozone in urban and rural air. however odorous compounds like ammonia, hydrogen sulfide are rarely deployed, because they are easily changed by circumstance conditions and perceived that they need a large number of measuring sites to assess mean concentration over the area. So, it is considered that the odor related phenomena could not be easily defined by cost-effective and convenient method. In this study, we developed the new sampling tool for ammonia evaluation in ambient air and the results of evaluation for evaluate the suitability of developed passive sampler for the measurement of daily averaged ammonia concentrations and spatial distribution survey are presented. Three types of absorbing solutions, filters and caps were tested at laboratory condition and the conversion factor, precision and suitability of the samplers were derived from triplicated measurement at paper mill. It is defined that for absorbing ammonia, 2% of phosphoric acid and glycerine mix(1:1) solution and chromatography filter are suitable and rubber cap is unsuitable to use during sampling and storage period. The conversion factor was derived 7.0㎂ at ordinary ambient air by comparison with reference method (indo-phenol method) at three different conditions. The calculated results of standard deviation among the samplers were lower than 2 ppb at 86% sampling sites of total 40 sites and we could recognize the ammonia sources and variations with change of wastewater treatment plant process. Therefore, the developed passive samplers are appropriate to survey ammonia spatial distribution.