大气挥发性有机物实时在线监测的双极性质子转移反应质谱仪研制
Development of Dipolar Proton Transfer Reaction Mass Spectrometer for Real-time Monitoring of Volatile Organic Compounds in Ambient Air
查看参考文献24篇
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文摘
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大气中挥发性有机物(VOCs)能参与光化学反应,导致臭氧和气溶胶等二次污染物的产生,实时精准地监测VOCs对于大气污染成因研究具有重要意义.在质子转移反应质谱(PTR-MS)研究基础上,本工作研制一套用于大气VOCs实时在线监测的双极性质子转移反应质谱仪(Dipolar proton transfer reaction mass spectrometer, DP-PTR-MS).相比单一反应离子H_3O~+的常规PTR-MS, DP-PTR-MS中有正负3种反应离子(H_3O~+、OH~-、(CH_3)_2COH~+),可根据实际检测需要选择切换,提高定性能力,并有效扩展检测范围.其中, H_3O~+反应离子用于检测质子亲和势大于H_2O的VOCs;OH~-反应离子可与H_3O~+反应离子配合识别VOCs,还可用于检测CO_2等无机物;(CH_3)_2COH~+反应离子可在排除干扰的情况下准确检测NH_3.利用6种标准气体测定DP-PTR-MS检出限和灵敏度,结果表明,DP-PTR-MS对甲苯的检出限为7×10~(-12)(V/V),对氨气的灵敏度为126.0 cps/10~(-9)( V/V).利用DP-PTR-MS对合肥市区大气VOCs开展连续78 h实时在线监测验证实验,结果表明,DP-PTR-MS可对大气中10~(-12)(V/V)量级VOCs进行长期实时在线监测,可作为大气污染成因研究和痕量VOCs排放监测的重要工具. |
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其他语种文摘
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Volatile organic compounds ( VOCs) in ambient air can participate in photochemical reactions, which lead to the generation of secondary pollutants such as ozone and aerosol. So real-time and accurate monitoring of atmospheric VOCs plays an important role in the study of the causes of air pollution. On the basis of proton transfer reaction mass spectrometry ( PTR-MS) research,a novel dipolar proton transfer reaction mass spectrometer ( DP-PTR-MS) for real-time and on-line monitoring atmospheric VOCs was developed. Compared with the conventional PTR-MS with one kind of reagent ion H_3O~+ , DP-PTR-MS had three kinds of reagent ions H_3O~+, OH~-, ( CH )_2COH~+, which could be switched according to the actual detection need. So DP-PTR-MS can improve the qualitative ability and expand the detection range effectively. The reagent ion H_3O~+ can be used for detecting VOCs whose proton affinities are greater than that of H_2O. The reagent ion OH~- can be used to identify VOCs cooperating with the reagent ion H_3O~+,and can also be used for detecting some inorganic substances such as CO_2. The reagent ion (CH_3)_2COH~+ can be used for accurately detecting NH3 under interference elimination circumstances. The limit of detection ( LOD) and sensitivity of DP-PTR-MS were measured by using six kinds of standard gases. The results showed that the LOD for detecting toluene was 7 × 10~(-12) ( V/V) and the sensitivity for detecting ammonia has reached 126 cps/10~(-9) (V/V). The ambient air in Hefei city was on-line and real-time monitored for continuous 78 hours with DP-PTR-MS. The results showed that the newly developed DP-PTR-MS could be used for long-term and real-time monitoring atmospheric VOCs with the concentration of 10~(-12)( V/V) level. DP-PTR-MS is an important tool for the study of the causes of atmospheric pollution and the monitoring of trace VOCs emissions. |
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来源
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分析化学
,2018,46(4):471-478 【核心库】
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DOI
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10.11895/j.issn.0253-3820.171234
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关键词
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双极性质子转移反应质谱
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挥发性有机物
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实时
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在线监测
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地址
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1.
中国科学院合肥物质科学研究院,医学物理与技术中心, 医学物理与技术安徽省重点实验室, 合肥, 230031
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中国科学技术大学, 合肥, 230026
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安徽省环境科学研究院大气环境研究所, 合肥, 230026
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中国科学院安徽光学精密机械研究所, 合肥, 230031
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-3820 |
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学科
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化学 |
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基金
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国家重点研发计划项目
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国家自然科学基金项目
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国家科技支撑计划项目
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文献收藏号
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CSCD:6224582
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