大气中气态氨的采集分析及氮同位素源解析综述
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南京信息工程大学环境科学与工程学院

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Review on colleting and analytical techniques and source apportionment of gaseous ammonia in ambient air with nitrogen isotopes
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School of Environmental Science Engineering,Nanjing University of Information Science Technology

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    摘要:

    氨是大气中生成PM2.5的主要前驱物之一。为了用同位素方法更精确地识别大气中氨的来源,减轻城市大气PM2.5污染,对近年来国内外有关气态氨的采样与浓度分析方法、氮同位素比值测定和估算方法、不同来源氨的氮同位素组成及同位素分馏、大气中氨的氮同位素组成及分馏、大气颗粒物和降水中NH4+的氮同位素组成、以及大气中氨的源解析等研究现状进行了分析。据此为未来的研究工作提出了若干建议:被动采样法会引起NH3的氮同位素分馏,采样前应确定最低采样质量;需加强对生物质燃烧、天然土壤、海洋、污水处理厂、植物,及其他潜在排放源氨的氮同位素组成研究;要进一步研究不同排放源氨的氮同位素组成变化机理;应以更高的时间分辨率同时测定气态NH3和颗粒态NH4+的质量浓度和氮同位素组成,以探讨颗粒态NH4+生成过程中氮的同位素分馏机理;需更加深入地研究不同大气污染状况和气象条件下气态氨的氮同位素分馏机理。

    Abstract:

    Gaseous ammonia is one of the main precursors for generating PM2.5 in the atmosphere. In order to identifying the sources of ammonia more accurately with isotopic technique,and to alleviating PM2.5 pollution in urban air, relevant data published in recent years have been collected and analyzed on sampling and quantifying of gaseous ammonia, determination or estimating of its nitrogen isotope ratio value, the nitrogen isotope compositions and fractionations for ammonia both in ambient air and emitted from different sources, the isotopic compositions of ammonium in atmospheric particulate matter and rainfall, as well as source apportionment of atmospheric ammonia. Several suggestions for future research have been accordingly proposed:The least amount of ammonia should be determined before collecting air samples with passive method in case of nitrogen isotope fractionation. Study may be strengthened on the nitrogen isotope compositions of ammonia from biomass combustion, natural soil, ocean, sewage plant, vegetation, and other potential sources. The mechanism on isotopic variation for ammonia from same emitting source could be further investigated. Both concentrations and isotopic compositions of gaseous ammonia and particulate ammonium perhaps may be simultaneously measured at higher temporal resolution,to understand the mechanism for nitrogen isotope fractionation in the process of ammonium forming. The isotopic fractionation of gaseous ammonia also should be deeply researched under different meteorological conditions and/or air contamination status.

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  • 收稿日期:2022-02-16
  • 最后修改日期:2022-04-05
  • 录用日期:2022-04-07
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