<b>滋賀県瀬田丘陵におけるPM</b><b><sub>2.5</sub></b><b>の無機イオン成分の</b><b>解析 </b>  [in Japanese] Analysis of the Inorganic Components of PM<sub>2.5</sub> at Seta Hill, Shiga Prefecture  [in Japanese]

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Abstract

滋賀県は環境基準の達成と非達成の境にある重要な地域にもかかわらず,PM<sub>2.5</sub>の実態把握が遅れている. 本研究では,2013年から2014年にわたり滋賀県瀬田丘陵にてPM<sub>2.5</sub>と粗大粒子PM<sub>C</sub>の捕集と無機イオン成 分の分析を行った.PM<sub>2.5</sub>にはSO<sub>4</sub><sup>2-</sup>とNH<sub>4</sub><sup>+</sup>が大半を占め,PM<sub>C</sub>はNa<sup>+</sup>やCa<sup>2+</sup>等陽イオン成分が多かった. PM<sub>2.5</sub>中のNH<sub>4</sub><sup>+</sup>とSO<sub>4</sub><sup>2-</sup>には強い相関が見られた.NH<sub>4</sub><sup>+</sup>と非海塩硫酸塩nss<sup>-</sup>SO<sub>4</sub><sup>2-</sup>の濃度変動は基本的に連動 していたが,2013年夏は桜島噴火と高温・弱風の影響でnss<sup>-</sup>SO<sub>4</sub><sup>2-</sup>濃度が大きな値を示した.NH<sub>4</sub><sup>+</sup>/nss<sup>-</sup>SO<sub>4</sub><sup>2- </sup>の観測期間中の平均値は0.79であり,沖縄県辺戸岬の0.56よりも高く,大津市街地の1.32より低かった. これらの値の違いは国内のNH<sub>4</sub><sup>+</sup>の発生源や大津市街地における自動車排ガス等の局地的なNH<sub>4</sub><sup>+</sup>の発生源の 影響によると考えられる.

Since Shiga Prefecture lies between areas that meet and do not meet the environmental quality standards for the substance PM<sub>2.5</sub> , it is important to determine its characteristics there. Unfortunately, insufficient data on PM<sub>2.5</sub> has been collected for Shiga Prefecture. In this study,PM<sub>2.5</sub> and PM<sub>C</sub> (coarse particulate matter) were collected in filters at Seta Hill in Shiga Prefecture from January 2013 to December 2014 and their inorganic components were analyzed. The main components of PM<sub>2.5</sub> were SO<sub>4</sub><sup>2- </sup>and NH<sub>4</sub><sup>+</sup>, whereas PM<sub>C</sub> mainly consisted of cations such as Na<sup>+ </sup>and Ca<sup>2+</sup>. There was a strong positive correlation between SO<sub>4</sub><sup>2- </sup>and NH<sub>4</sub><sup>+</sup>. Although the variation of NH<sub>4</sub><sup>+</sup>was usually connected to that of nss-SO<sub>4</sub><sup>2-</sup> (non-sea salt sulfate), the concentration of nss-SO<sub>4</sub><sup>2- </sup>in Summer of 2013 was higher than usual due to the eruption of Mt. Sakurajima and weather conditions such as high temperature and low wind. The average equivalent ratio of NH<sub>4</sub><sup>+</sup>/SO<sub>4</sub><sup>2- </sup>during the observation period was 0.79. This value was higher than that at Cape Hedo, Okinawa Prefecture (0.56) and lower than that in the urban area of Otsu City, Shiga Prefecture (1.32). It is surmised that the differences are due to the influences of domestic urban sources of NH<sub>4</sub><sup>+</sup>and local sources of NH<sub>4</sub><sup>+</sup>, such as automobile exhaust gases.

Journal

  • Journal of Environmental Conservation Engineering

    Journal of Environmental Conservation Engineering 45(3), 146-154, 2016

    Society of Environmental Conservation Engineering

Codes

  • NII Article ID (NAID)
    130005157494
  • NII NACSIS-CAT ID (NCID)
    AN00046213
  • Text Lang
    JPN
  • ISSN
    0388-9459
  • NDL Article ID
    027207119
  • NDL Call No.
    Z16-834
  • Data Source
    NDL  J-STAGE 
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