光散射颗粒物监测仪在环境空气监测中的适用性

为了研究光散射颗粒物监测仪在环境空气监测中的适应性,参照《环境空气颗粒物(PM10和PM2.5)连续自动检测技术要求及检测方法》(HJ 653-2013),在北京秋季使用PQ200(滤膜采样器)对DustTrak8530、LD-6S、HBKLW-2共3种光散射仪器进行比对测试.结果表明,3种光散射仪器的平行性都达标;在监测PM10时,3种仪器与PQ200的线性相关系数都达标,斜率只有HBKLW-2达标,截距除HBKLW-2略微超标外都与标准相差较远;在监测PM2.5时,3种仪器与PQ200的线性相关系数都达标且优于PM10,斜率只有HBKLW-2和LD-6S达标,截距绝对值相比PM10有所减小,但只有HBKLW-2达标;经校正因子修正后,3种仪器与PQ200的线性回归斜率达标、相关系数不变、监测PM2.5的截距相比PM10更加接近标准值,故光散射仪器更加适用于环境空气PM2.5监测.

Applicability of light scattering instruments in ambient air particulate matter monitoring

In order to study adaptability of light scattering instruments in ambient air particulate matter monitoring, according to requirements of Specifications and Test Procedures for Ambient Air Quality Continuous Automated Monitoring System for PM10 and PM2.5, three types of light scattering monitors (DustTrak8530, HBKLW-2 and LD-6S) were used to do a comparison test in fall of Beijing . The results showed that the parallelism of three light scattering monitors reached the standard. When monitoring PM10, the linear correlation coefficients of three light scattering monitors and PQ200 reached the standard and only the slope of HBKLW-2 was qualified, besides intercept of HBKLW-2 slightly exceeded the standard and others were far away from the standard. Compared to monitoring of PM10, the linear correlation coefficients of three light scattering monitors and PQ200 during the monitoring PM2.5 were much better to reach the standard compared to monitoring of PM10. But the slope of HBKLW-2 and LD-6S can only reach the standard for the slope, meanwhile, absolute values of PM2.5 intercept decreased and only HBKLW-2 reached the standard. After the calibration, the linear correlation coefficients of three light scattering monitors and PQ200 got to the regression and related coefficient maintained, whereas the intercepts were closed to the standard compared to the monitoring of PM10. Therefore, these three light scattering monitors are suitable for monitoring PM2.5 in ambient.