Design and evaluation of new low-pressure impactor. I
Design and evaluation of new low-pressure impactor. I
复制标题
新型低压冲击器的设计与评价
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
S. Friedlander
中科院分区：
文献类型：
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作者：
S. Hering;R. Flagan;S. Friedlander
开发了一个八级低压冲击器，其50%效率截止值为4.0、2.0、1.0、0.05、0.26、0.11、0.075和0.05 μm气动直径。大于0.5 µm的颗粒在接近大气压的条件下采样;四个阶段的滞止压力低于8-140 mm Hg绝对值的射流，分离较小的气溶胶。0.50、0.26和0.11 μm截止级用单分散聚苯乙烯乳胶球校准。最后两个阶段进行了比较与电气气溶胶分析仪测量实验室产生的硫酸雾。冲击器收集效率的研究表明，颗粒反弹和再夹带是不重要的收集表面时，凡士林涂层。冲击采样器每级有一个喷嘴，因此特别适合通过闪蒸和随后的气相分析方法测定气溶胶中的硫和硝酸盐。
An eight-stage, low-pressure impactor is developed with 50% efficiency cutoffs of 4.0, 2.0, 1.0, 0.05, 0.26, 0.11, 0.075, and 0.05-µm aerodynamic diameter. Particles larger than 0.5 µm are sampled at near atmospheric pressure; four stages with stagnation pressures below the jet of 8-140 mm Hg absolute, size segregate the smaller aerosol. The 0.50, 0.26, and 0.11-µm cutoff stages are calibrated with monodisperse polystyrene latex spheres. The final two stages are compared with electrical aerosol analyzer measurements of a laboratory-generated sulfuric acid mist. Studies of impactor collection efficiency show that particle bounce and reentrainment are not important when the collection surfaces are Vaseline coated. The impactor has one jet per stage, and thus is especially suited for aerosol sulfur and nitrate determinations by the method of flash volatilization and subsequent gas-phase analysis.