Changes of the Storage Stability of Ketones Collected on Activated Coconut Carbon in Environmental Ketone Measurement

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  • SAKAMOTO Takayuki
    NICHIGO KYUSHU Inc.
  • HINOUE Mitsuo
    Department of Environmental Management, School of Health Sciences, University of Occupational and Environmental Health
  • YOSHIKAWA Masahiro
    Department of Environmental Management, School of Health Sciences, University of Occupational and Environmental Health

Bibliographic Information

Other Title
  • ヤシ殻活性炭を用いた固体捕集法におけるケトンの保存安定性の経時変化
  • ヤシガラカッセイタン オ モチイタ コタイホシュウホウ ニ オケル ケトン ノ ホゾン アンテイセイ ノ ケイジ ヘンカ

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Description

The storage stability for six ketones was studied on four activated coconut carbons commonly used for air sampling in Japan. As the ratios of the enol form of cyclohexanone and methyl ethyl ketone are high, the ketones showed drastic losses during storage (storage stability), which could be attributed to catalytic oxidation and chemisorption. Moreover, adsorbed water caused a further decrease in recoveries of the ketones from the carbons. Because keto-enol tautomerism and hydration are catalyzed by acid or base, the relationships between the recoveries of the ketones from the carbons and pH in the aqueous solution of the carbons and the ignition residue of the carbons were investigated. As a result, the intensity of acidity or basicity of the carbons correlated with the loss of the ketones during storage, but the ignition residue of the carbons did not. Therefore, these results lead us to the conclusion that a more neutral coconut carbon is more suitable for the collection of aliphatic ketones, and activated coconut carbons are not suitable for cyclohexanone.

Journal

  • Journal of UOEH

    Journal of UOEH 33 (2), 147-156, 2011

    University of Occupational and Environmental Health, Japan

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