Abstract A PM2.5 high-volume impactor (HVI) sampler is developed, which has a flow rate of 1130 L per minute (lpm) (1.13 m3/min) and in it, the filter size used is of 8 inch × 10 inch. The major advantages of this sampler as compared to other low-volume sampler (flow rate 16.67 lpm) are lower uncertainty in mass measurement, higher PM2.5 mass collection and lesser sampling time. To develop this PM2.5 HVI sampler, a series of simulation and experimental studies were carried out. The optimized D50 cutoff size of 2.52 μm was obtained experimentally under real ambient conditions (i.e. with polydisperse ambient particles) after the parametric adjustments. The commercial PM2.5 HV sampler cutoff size was also evaluated experimentally, and agreed well to the D50 cutoff size of developed PM2.5 HVI sampler. Field performance studies of developed PM2.5 HVI sampler were also carried out under both high- and low- particle mass loading conditions along with commercial PM2.5 high- and low-volume samplers. The developed PM2.5 HVI sampler agreed well with commercial PM2.5 high- and low-volume samplers, i.e. PM2.5 HVS, BAM and WINS reference sampler in mass measurement with mean deviations of 12.7, 18.5 and 11.7 μg/m3 (i.e. 5.05, 4.86 and 3.70%), respectively under tested conditions. This PM2.5 HVI sampler is very useful especially where the extensive offline chemical analysis of filter samples/high amount of particulate material is needed for source apportionment studies or analysis of bioassay or toxicological purposes (in vitro/in vivo studies), diurnal studies, and air sampling where the mass concentration of particles is very low, e.g. marine, polar regions, most of the rural sites, etc.

中文翻译：

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PM2.5 大容量冲击器入口设计的理论和现场评估

摘要 研制了一台 PM2.5 大容量撞击式 (HVI) 采样器，其流速为 1130 L/min (lpm) (1.13 m3/min)，其中使用的过滤器尺寸为 8 英寸 × 10 英寸. 与其他小体积采样器（流速 16.67 lpm）相比，该采样器的主要优点是质量测量的不确定性更低、PM2.5 质量收集更高和采样时间更短。为了开发这种 PM2.5 HVI 采样器，进行了一系列模拟和实验研究。2.52 μm 的优化 D50 截断尺寸是在参数调整后在真实环境条件（即多分散环境颗粒）下通过实验获得的。商业 PM2.5 HV 采样器的截止尺寸也进行了实验评估，并且与开发的 PM2.5 HVI 采样器的 D50 截止尺寸非常吻合。发达 PM2.5 的现场性能研究。5 HVI 采样器也在高和低粒子质量负载条件下与商用 PM2.5 高容量和低容量采样器一起进行。开发的 PM2.5 HVI 采样器与商用 PM2.5 高容量和低容量采样器（即 PM2.5 HVS、BAM 和 WINS 参考采样器在质量测量中的平均偏差为 12.7、18.5 和 11.7 μg/m3（即5.05、4.86 和 3.70%），分别在测试条件下。这种 PM2.5 HVI 采样器非常有用，特别是在需要对过滤器样品/大量颗粒材料进行广泛的离线化学分析以进行源分配研究或生物测定或毒理学目的分析（体外/体内研究）、昼夜研究、和空气采样，其中颗粒的质量浓度非常低，例如海洋、极地地区、大多数农村地区等。