Design and Evaluation of Modified High-Volume Impactor for PM<sub>2.5</sub> (HVI<sub>2.5</sub>)

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  • ハイボリュームエアサンプラー用PM<sub>2.5</sub>インパクター （HVI<sub>2.5</sub>） の改良と特性評価
  • ハイボリュームエアサンプラー用PM₂.₅インパクター(HVI₂.₅)の改良と特性評価
  • ハイボリュームエアサンプラーヨウ PM ₂.₅ インパクター(HVI ₂.₅)ノ カイリョウ ト トクセイ ヒョウカ

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Abstract

<p>This paper describes the development of an improved version of the High-Volume Impactor for PM2.5 (HVI2.5) for the sampling of ambient PM2.5 aerosols, and improvement of its operation with an alternative impaction substrate. The improved-HVI2.5 adopted a barb at the edge of the impaction plate to prevent the viscous liquid applied to the impaction substrates (e.g., fibrous filter-sheet) falling in drops onto the aerosol filter downstream resulting in the contamination of the collected aerosols. The size separation characteristics obtained for the improved-HVI2.5 yielded 50% cut-off aerodynamic diameter Dp50 of 2.5 μm at the flow rate of 520 L/min, with a steeper size selection curve than required by the Japanese Industrial Standards JIS Z8851:2008 and those of the Well Impactor Ninety-Six and Sharp-Cut Cyclone. As an alternative way to reduce the re-suspension of collected coarse particles from the impaction substrate without using a viscous liquid, the use of a hydrous gel-sheet was tested as an impaction substrate. The obtained Dp50 and size selection curves were almost identical to those of the silicone-oil-impregnated glass-fiber filter. In addition, the uniformity of the collected substances on the aerosol filter was examined. Unlike SO42- that is known to reside in fine mode size range, Ca2+, which consists of soil particle components, exhibited a non-uniform concentration distribution on the filter.</p>

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