Development of the active sampler for the formaldehyde in indoor air using 2,4-pentanedione impregnated silica gel scavenger

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  • 2,4-ペンタンジオン含浸シリカゲル捕集剤を用いた室内空気中のホルムアルデヒドのアクティブサンプラーの開発
  • 2,4-ペンタンジオン ガンシン シリカゲルホシュウザイ オ モチイタ シツナイ クウキ チュウ ノ ホルムアルデヒド ノ アクティブサンプラー ノ カイハツ

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Abstract

The standard measurement of formaldehyde in indoor air involves the use of a 2,4-DNPH cartridge collection and solvent extraction/HPLC. This method is adopted and widely used as the standard measuring method by WHO, U.S. EPA, and JIS. However, the reagent in this standard method has exhibited mutagenicity and carcinogenicity, and therefore, a new alternative method is now desired. In this study, a scavenger with 2,4-pentanedione impregnated silica gel, which was free of the harmfulness associated with the reagent, was produced, and it was used in an active sampler which filled the glass tube with this. Using this sampler, basic examination such as the following were carried out: collection efficiency test, determination of theoretical value and its comparison with the analytic value, the standard DNPH-based method carried out in residential environment, and relative measurement of this method of the extraction method. The results, show that the extraction method used the method for directly supplying the 2,4-pentanedione solution in the sampler. The repeatability in sampling formaldehyde gas of 0.03 ppm was 3.5 % in the relative standard deviation. Formaldehyde with a theoretical concentration of 0.066-0.190 ppm was produced using a polyester bag. The analytic measurement value obtained using this method, agreed within ±3.8% with the theoretical value. In addition, there was a significant correlation between the measured values obtained by simultaneous measurement using this and the standard DNPH-based methods, in residential environment. Thus, the practicability of this method was confirmed.

Journal

  • Indoor Environment

    Indoor Environment 16 (2), 79-87, 2013

    Society of Indoor Environment, Japan

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