Tombolini Francesca, Listrani Stefano, Campopiano Antonella, Plebani Carmela
INAIL Department of Occupational Medicine, Epidemiology and Hygiene, Italy.
Ind Health. 2016;54(5):403-409. doi: 10.2486/indhealth.2015-0227.
Penetration measurements through commercially available filtering facepieces were performed with monodisperse DEHS aerosols ranging from 0.03 μm to 0.40 μm (either singly charged or neutralized), before and after 500 mg of paraffin oil loading. The distinct behavior of Coulomb and polarization capture efficiency is studied: as in the case of non loading also in the case of loading 500 mg of paraffin oil, the electrostatic capture mechanisms are mainly due to the Coulomb contribution up to aerosol particle diameter of about 0.10 μm, just when the polarization contribution becomes substantial. Both Coulomb and polarization capture mechanisms are influenced by the presence of 500 mg of paraffin oil, resulting less effective than the oil unloaded case of about 12% and 11%, respectively. By the occupational hygiene point of view, there is a degradation in the filter performance due to oil loading that the user does not realize because there is no remarkable variation in the breathing resistance.
使用粒径范围为0.03μm至0.40μm的单分散DEHS气溶胶（带单电荷或中和），在加载500mg石蜡油之前和之后，对市售过滤面罩进行穿透测量。研究了库仑和极化捕获效率的不同行为：与未加载的情况一样，在加载500mg石蜡油的情况下，静电捕获机制主要是由于库仑作用，直到气溶胶粒径约为0.10μm时，极化作用才变得显著。库仑和极化捕获机制都受到500mg石蜡油存在的影响，分别比未加载油的情况效率降低约12%和11%。从职业卫生的角度来看，由于加载油导致过滤器性能下降，但使用者并未意识到，因为呼吸阻力没有明显变化。
