引用本文:
梁苗, 姚波, 陈丽曲, 权维俊, 马志强, 周怀刚. 气相色谱-质谱联用法在线观测大气中的三氟化氮(NF3)[J]. 环境化学, 2018, 37(10): 2152-2158
LIANG Miao, YAO Bo, CHEN Liqu, QUAN Weijun, MA Zhiqiang, ZHOU Huaigang. In-situ measurement of atmospheric nitrogen trifluoride (NF3) using GC-MS method[J]. Environmental Chemistry, 2018, 37(10): 2152-2158

气相色谱-质谱联用法在线观测大气中的三氟化氮(NF3)
梁苗1, 姚波1, 陈丽曲1, 权维俊2,3, 马志强2, 周怀刚2,3
1. 中国气象局气象探测中心, 北京, 100081;
2. 京津冀环境气象预报预警中心, 北京, 100089;
3. 上甸子区域大气本底观测站, 北京, 101500
摘要:
基于气相色谱-质谱联用技术(GC-MS)以及自制吸附解析装置,研发了一套大气中三氟化氮(NF3)的自动在线监测系统,测试结果表明,系统精度3.9%(1σ),准确度1.2%,检出限0.23×10-12,表明该系统适用于大气中NF3浓度在线观测.2016年9月-2017年5月在北京上甸子本底站进行了在线观测实验,空气样品时间分辨率130 min,获得大气中NF3的本底和非本底浓度.本底数据百分比53.1%,平均本底浓度为1.72×10-12,与同纬度带的爱尔兰Mace Head站和美国Trinidad Head站浓度相当.非本底浓度的中位数2.41×10-12,相对平均本底浓度抬升40.1%.
关键词:    三氟化氮(NF3)    气相色谱-质谱联用(GC-MS)    在线观测   
In-situ measurement of atmospheric nitrogen trifluoride (NF3) using GC-MS method
LIANG Miao1, YAO Bo1, CHEN Liqu1, QUAN Weijun2,3, MA Zhiqiang2, ZHOU Huaigang2,3
1. Meteorological Observation Centre(MOC), China Meteorological Administration(CMA), Beijing, 100081, China;
2. Environmental Meteorology Forecast Center of Beijing-Tianjin-Hebei, Beijing, 100089, China;
3. Beijing Shangdianzi Regional Atmosphere Watch Station, Beijing, 101500, China
Abstract:
Based on gas chromatography-mass spectrometry (GC-MS) and a custom-made sample prepartion unit, an in-situ system was developed for atmospheric nitrogen trifluoride (NF3) measurement. Precision, accuracy and detection limit were 3.9% (1σ), 1.2% and 0.23×10-12, respectively, which indicate the system could be used for in-situ measurement of atmospheric NF3. Field in-situ measurement was conducted during September 2016 to May 2017 at the Shangdianzi Background Station with a time resolution of 130 minutes for air samples. Both background and pollution samples were captured. Using the pollution filter, 53.1% samples were selected as background data with an average mixing ratio of the 1.72×10-12, consistent with the background level observed at Mace Head, Ireland and Trinidad Head, USA located at the similar latitude, while the median mixing ratio of polluted samples was 2.41×10-12, which was 40.1% higher compared to the average background mixing ratio.
Key words:    nitrogen trifluoride (NF3)    gas chromatography-mass spectrometry (GC-MS)    in-situ measurement   
收稿日期: 2018-03-14
基金项目: 科技部国家重点研发计划(2017YFB0504000)和国家自然科学基金(41575114,41730103)资助.
姚波,Tel:010-68409554,E-mail:yaob@cma.gov.cn
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