摘要
文章介绍了以移动监测车为载体的集成了VOCs在线质谱仪、GPS信息记录仪、气象参数仪等设备的VOCs走航观测系统,该系统对VOCs的测定限优于10-9(V/V)。在连续走航模式下,可在5 s、27 m内产生一组监测数据,实现了VOCs的高时空分辨监测。在江苏响水"3·21"特别重大爆炸事故中,将该系统探索性地应用于对事故核心区域附近VOCs的高时空分辨率的连续走航观测(2019年3月22日-26日)及核心区域外围点位的定点观测(2019年3月27日-30日)。监测过程发现:苯为主要污染物,最高瞬时浓度为43.4 mg/m^(3),其次为甲苯、二甲苯等有机污染物;2019年3月22日开始,污染物浓度有逐渐降低的趋势;爆炸点600 m范围内VOCs浓度较高;主要受影响区域为爆炸点2 km范围内,另外VOCs的分布有着巨大的时空差异;定点观测发现,事故处置期间在距离爆炸点1.4 km处偶有检出较高浓度的苯。
Volatile organic compounds(VOCs)navigation monitoring system,which was based on mobile monitoring vehicle and integrated with online mass spectrometry for VOCs,GPS information recorder,meteorological parameter instrument and other equipments were introduced.The limit of determination of VOCs are better than 10-9(V/V).In the mode of continuous navigation,a group of monitoring data can be obtained within 5 s and 27 m,which realized continuous high spatio-temporal resolution monitoring of VOCs.The system was exploratively applied to Xiangshui"3·21"particular major explosion accident in Jiangsu Province and high spatial-temporal resolution continuous navigation monitoring of VOCs near the core of the accident site(March 22-26,2019)and the fixed-point monitoring of peripheral points of the core accident(March 27-30,2019)were carried out to monitor the emission of pollutants generated by the accident and evaluate the impact of the accident on the peripheral areas.The monitoring process indicated that benzene was the critical pollutant in this accident,and its highest instantaneous concentration was 43.4 mg/m^(3),followed by other organic pollutants such as toluene and xylene.From the22 nd,the concentration of pollutants had a gradually decreasing trend.The higher concentration of VOCs within the 600 m explosive spot was the high-risk area.The affected area was within 2 km of the explosion point.In addition,the distribution of VOCs had a huge spatio-temporal difference.The fixed-points monitoring found that,high concentration of benzene was occasionally detected in the later stage of the accident,which was 1.4 km away from the explosion spot.
作者
徐亮
宋兴伟
梁宵
王攀攀
康晓峰
苏海波
高伟
XU Liang;SONG Xingwei;LIANG Xiao;WANG Panpan;KANG Xiaofeng;SU Haibo;GAO Wei(Jiangsu Province Environmental Monitoring Centre,Nanjing 210019,China;Kunshan Hexin Mass Spectrometry Technology Co.Ltd.,Kunshan 215315,China;China National Environmental Monitoring Centre,Beijing 100012,China;Guangzhou Hexin Instrument Co.Ltd.,Guangzhou 510530,China;Institute of Mass Spectrometer and Atmospheric Environment,Jinan University,Guangzhou 510632,China;Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution,Guangzhou 510632,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2020年第7期66-71,共6页
Environmental Science & Technology
基金
国家标准制修订项目(2017-23)
广州市开发区国际合作项目(2017GH18)。
