光散射法和β射线法监测PM_(2.5)和PM_(10)的对比研究

The comparison research on determination of PM_(2.5) and PM_(10) concentration by light scattering method and β-ray method

本文利用GRIMM EDM180和METONE BAM1020两种仪器1年的监测数据对光散射法和β射线法在监测PM_(2.5)和PM_(10)质量浓度中的差异进行了对比研究并提出了订正方法。研究结果表明:两种方法测得的PM_(2.5)(PM_(10))质量浓度有很好地一致性,其相关系数为0.956(0.909)。β射线法测得的PM_(2.5)(PM_(10))质量浓度平均值明显大于光散射法,且这种差异在春秋季表现更为明显,这与露点温度有关。但两种方法的PM_(2.5)实时质量浓度在夏、冬两季的差值存在正负不稳定,在春、秋两季的比较稳定;而PM_(10)实时质量浓度差值全年都比较稳定。两种方法的质量浓度差值与β射线法的质量浓度相关系数最大,PM_(2.5)和PM_(10)的分别达0.472和0.718,并由此计算了相应的订正方法,可以很大程度的改善两种方法监测数据的吻合度。

In order to compare light scattering method and P-ray method on monitoring PM2.5 and PM10 concentration, the study collects data for one year using GRIMM EDM180 and METONE BAM1020. The results show high correlation between PM2.5 （ PM10） by two methods and the correlation coefficient is 0.956（0.909）. The PM2. 5 （ PM10） concentration by P-ray method is higher than that by light scattering method on average. And the difference between two methods in spring and autumn is lager than that in summer and winter, which may relative to dew point temperature. However, it changes in different seasons for deviation of PM2.5 or PM10 concentrations on real time by two methods. At last, it’s found that the difference between concentrations by two methods has largest relationship with concentration by P-ray method. The correlation coefficients are 0.472 and 0.718 for PM2.5 and PM10 respectively. Based on the linear equations, we can improve the comparability between parameter matter concentrations by two methods.