重量法与光散射法监测北京市PM2.5的结果比对分析

Comparison of PM_(2.5) Mass Concentration in Beijing Measured by Gravimetric Method and Light Scattering Method

选择大气污染较重的北京西三环典型交通带作为研究区域,采用重量法和光散射法监测PM_(2.5)。参照美国EPA关于PM_(2.5)连续监测仪器手工采样比对测试的性能指标和认证方法,结合我国现行的相关技术规范,采用平行性检验及线性回归分析两种方法测定结果间的有效性和可比性。结果表明:两种方法测定PM_(2.5)的结果具有较好的相关性,然而受颗粒物物理性质、化学组成及温湿度等的影响,测定结果间存在一定偏差,采用光散射法监测PM_(2.5)仍需用重量法做修正。

PM 2.5 mass concentration from a sampling site near West-3rd-Ring Road in a typical traffic zone in Beijing was measured by gravimetric method and light scattering method. According to U.S. EPA authentication method and equipment performance indexes in the comparison of continuous monitoring and manual monitoring, in combination with the national current relevant technical specifications, the availability and comparability of the two methods were discussed by parallelism test and linear regression analysis. Results showed that PM 2.5 mass concentration measured by the two methods were well correlated, there was a certain deviation between them due to the influence of physical properties, chemical composition, temperature and humidity. Light scattering method still needs to be corrected by gravimetric method.