传感技术在环境空气监测中的方法适用性研究
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摘要
采用某品牌3台传感器,对环境空气中气态污染物(NO_2、SO_2、O_3、CO)和颗粒物(PM_(10)、PM_(2.5))进行为期1个月的连续监测,探讨传感技术在环境空气监测中的方法适用性。研究表明,3台传感器监测的各污染物质量浓度均显著相关,Pearson相关系数>0.9(p<0.01);监测的颗粒物与国控点数据显著相关且质量浓度水平接近,Pearson相关系数>0.9(p<0.01);PM_(2.5)传感器测定值相对于国控点数据的平均相对误差仅为-7.3%,均值绝对误差<2μg/m~3;传感器在高湿度下的PM_(2.5)测定值与国控点数据相吻合,当相对湿度为80%～90%时,平均相对误差仅为-0.9%;传感器气态污染物测定值与国控点数据之间存在差异,电化学原理气态污染物传感器性能仍有待提升。
The gaseous pollutants(NO_2/SO_2/O_3/CO) and particulate matters(PM_(10)/PM_(2.5)) in ambient air were continuously monitored for a month by the sensors from three different brands for evaluating their applicability in ambient air monitoring. Results showed that the mass concentrations of all the pollutants measured by the three sensors were highly correlated. Pearson correlation coefficient was above 0.9(p<0.01). The mass concentrations of particulate matters were approximate to the data from national monitoring sites and there were significant correlations between them. Pearson correlation coefficient was above 0.9(p<0.01). The average relative error of PM_(2.5) concentration between from sensor measurement and national monitoring sites was-7.3%, while the average absolute error was less than 2 μg/m~3. The concentrations of PM_(2.5) from sensor measurement were in good accordance with those from national monitoring sites in a high humidity environment. When the relative humidity was between 80% and 90%, the average relative error was merely-0.9%. There were differences between the concentrations of gaseous pollutants(NO_2/SO_2/O_3/CO) measured by the sensors and from the national monitoring sites, thus the requirement to sensor performance was enhanced.
The gaseous pollutants(NO_2/SO_2/O_3/CO) and particulate matters(PM_(10)/PM_(2.5)) in ambient air were continuously monitored for a month by the sensors from three different brands for evaluating their applicability in ambient air monitoring. Results showed that the mass concentrations of all the pollutants measured by the three sensors were highly correlated. Pearson correlation coefficient was above 0.9(p<0.01). The mass concentrations of particulate matters were approximate to the data from national monitoring sites and there were significant correlations between them. Pearson correlation coefficient was above 0.9(p<0.01). The average relative error of PM_(2.5) concentration between from sensor measurement and national monitoring sites was-7.3%, while the average absolute error was less than 2 μg/m~3. The concentrations of PM_(2.5) from sensor measurement were in good accordance with those from national monitoring sites in a high humidity environment. When the relative humidity was between 80% and 90%, the average relative error was merely-0.9%. There were differences between the concentrations of gaseous pollutants(NO_2/SO_2/O_3/CO) measured by the sensors and from the national monitoring sites, thus the requirement to sensor performance was enhanced.
引文
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[2] 王东方,高松,包权,等.基于厚膜传感器的空气质量监测仪性能及应用研究[J].中国环境监测,2009,25(6):50-53.
[3] 高玉梅,孟国鑫,楼晟荣,等.β射线吸收法双通道PM2.5/PM10监测装置性能探究[J].环境监测管理与技术,2017,29(5):47-50.
[4] KELLY K E,WHITAKER J,PETTY A,et al.Ambient and laboratory evaluation of a low-cost particulate matter sensor[J].Environmental Pollution,2017,221:491-500.
[5] WU C F,DELFINO R J,FLORO J N,et al.Evaluation and quality control of personal nephelometers in indoor,outdoor and personal environments[J].J Expo Sci Env Epid,2004,15(1):99-110.
[6] GURUMURTHY R,JOHN L A,GREGORY C P,et al.Characterizing indoor and outdoor 15 minute average PM2.5 concentrations in urban neighborhoods[J].Aerosol Science and Technology,2003,37(1):33-45.
[7] 姜迪,李聪.南京市区PM2.5扩散与气象条件的关系[J].环境监测管理与技术,2016,28(1):36-40.
[8] DAY D E,MALM W C.Aerosol light scattering measurements as a function of relative humidity:a comparison between measurements made at three different sites[J].Atmos.Environ.,2001,35(30):5169-5176.
[9] 王东东,朱彬,王静.利用差分吸收光谱系统对O3,SO2和NO2的监测分析[J].环境科学研究,2009,22(6):650-655.
[10] 林艺辉,谢品华,秦敏,等.北京冬季大气SO2、NO2与O3的监测与分析[J].大气与环境光学学报,2007,2(1):55-59.
[11] 孙思思,丁峰,陆晓波,等.南京市典型臭氧污染过程的激光雷达垂直观测解析[J].环境监测管理与技术,2018,30(3):60-63.
[12] 陈宜然,陈长虹,王红丽,等.上海臭氧及前体物变化特征与相关性研究[J].中国环境监测,2011,27(5):44-49.
[13] 薛敏,王跃思,孙扬,等.北京市大气中CO的浓度变化监测分析[J].环境科学,2006,27(2):200-206.
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