内标法对PM_(2.5)切割器快速评价方法的修正

Modification of Rapid Evaluation Method for PM 2.5 Cutter by Internal Calibration Method

利用多分散颗粒物对PM_(2.5)切割器的快速检测,可极大提高检测效率。在实践中,发现空气动力学粒径谱仪的粒径测量结果偶尔存在偏移(偏小)。为克服偏移的影响,提出在多分散粒子中加入单分散微球标准物质,通过微球粒径标准值对捕集效率曲线的偏移进行修正,对进口及国产的PM_(2.5)切割器进行了评价研究,测量结果与单独使用8种粒径单分散微球评价结果基本一致。该方法既利用了空气动力学粒径谱仪方法在PM_(2.5)切割器评价方法中的高效率,又有效避免偏移造成的影响,在空气动力学粒径谱仪的应用中具有提高测量可靠性的作用。

The rapid detection of PM_(2.5)cutter by using polydisperse particles can greatly improve the detection efficiency.It was found that the particle size measurement results of aerodynamics particle size spectrometer are occasionally offset(small).In order to overcome the influence of drift,the reference material of monodisperse microspheres was proposed to be added into the polydisperse particles.The drift of the capture efficiency curve can be corrected by the standard value of the particle size.This method was used to evaluate imported and domestic PM_(2.5)cutters,and the evaluation results were compared with the evaluation results of eight kinds of particle size monodisperse microspheres.This method not only made use of the high efficiency of aerodynamic particle size spectrometer method in PM_(2.5)cutter evaluation,but also effectively avoided the influence caused by offset,which has the role of improving the measurement reliability in the application of aerodynamic particle size spectrometer.