空気中化学物質測定用拡散サンプラーの安定性評価及び実試料測定への応用  [in Japanese] Storage Stability of Diffusive Samplers and Application to Real Air Samples  [in Japanese]

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Abstract

4種類のガス状化学物質測定用拡散サンプラー(カルボニル化合物測定用DSD-DNPH,オゾン測定用DSD-OZONE,酸性ガス測定用DSD-TEA,塩基性ガス測定用DSD-NH<sub>3</sub>)の捕集後における安定性を検討した.また,検討した安定性に基づき,60戸の住宅でガス状化学物質の実態調査を行った.DSD-TEA(二酸化窒素)を除く拡散サンプラーは,室温保存の場合,4週間における捕集量の増減は約7.2% 以内であった.DSD-TEAを用いた二酸化窒素の室温保存における安定性は,他の拡散サンプラーより変動が大きく,4週間後の減少率は9.0% を示した.この原因として,室温保存中にNO<sub>2</sub><sup>-</sup>がNO<sub>3</sub><sup>-</sup>に酸化されたことが推測される.したがって,捕集後のDSD-TEAは,2週間以内に分析しない時は,冷蔵,冷凍保存する必要がある.住宅の屋内外でガス状化学物質の実態調査を行ったところ,二酸化窒素を除くほとんどの化学物質は,夏季の方が冬季に比べ濃度が高い傾向を示した.冬季における二酸化窒素の屋内の平均濃度は,夏季の約15倍と高濃度を示し,主な発生源は燃焼系ストーブであることが示唆された.

The storage stabilities of four kinds of diffusive sampling devices, (DSD-DNPH for carbonyls, DSD-OZONE for ozone, DSD-TEA for acid gases and DSD-NH<sub>3</sub> for basic gases), were evaluated. Based on the resulting storage stability, chemical substances found both indoor and outdoor air were measured by using DSD-samplers. Almost all DSD-samplers, except for nitrogen dioxide (DSD-TEA), showed degradation in less than 7.2 % for four weeks at room temperature. The storage stability of nitrogen dioxide collected in the DSD-TEA showed degradation in 9 % for four weeks at room temperature. It is suggested that nitrite was oxidized to nitrate during the storage term at room temperature. In measurements of acid gases using DSD-TEA, when the analysis is not performed within two weeks, the samplers should be stored in a refrigerator at 4°C. In applications to real air samples, it was observed that almost all chemical substances, except for nitrogen dioxide, were higher in the summer than in the winter. The mean nitrogen dioxide concentration was significantly higher at 15 times in the winter than in the summer. It was suggested that the primary sources indoors are combustion processes, such as unvented combustion appliances, e.g. gas stoves.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 62(7), 603-609, 2013-07-05

    The Japan Society for Analytical Chemistry

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Codes

  • NII Article ID (NAID)
    10031178756
  • NII NACSIS-CAT ID (NCID)
    AN00222633
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    05251931
  • NDL Article ID
    024761170
  • NDL Call No.
    Z17-9
  • Data Source
    CJP  NDL  J-STAGE 
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