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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Organic molecular tracers ： ウィキペディア英語版 Organic molecular tracers Organic molecular tracers, also referred to as organic molecular markers, are compounds or compound classes of interest in the field of air quality because they can help identify particulate emission sources, as they are relatively unique to those sources. This approach is generally applied to particulate matter under 2.5μm in diameter because of the formation mechanisms and the health risks associated with this size regime.〔 〕 With tracer compounds, the principles of mass balance are used to 'trace' emissions from the source to the receptor site where a sample is taken. Use of organic tracers has become more common as measurement quality has improved, costs have decreased, and compounds that were historically good tracers, such as lead, have decreased in ambient concentrations due to various factors including government regulation. ==Requirements== In order to be used as a tracer, a compound must be emitted preferentially by some sources and not by others, giving the emission source a relatively unique chemical makeup. The compound must react slowly enough in the atmosphere that it is chemically conserved from the emission source to the receptor site where an ambient sample may be taken. Additionally, a tracer species should not be formed in the atmosphere and it should not volatilize during transport so that mass balance is maintained.〔 〕 Tracer compounds must then be of primary origins (not formed in the atmosphere), which are created through condensation and coagulation of mainly combustion and biological sources.〔H Seinfeld and N. Pandis. Atmospheric chemistry and physics: from air pollution to climate change. (2006)〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Organic molecular tracers」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.