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Development of a Separation and Quantification Method of Ammonium Sulfate in Ambient PM<sub>2.5</sub>
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- Saito Ikue
- Tokyo Metropolitan Institute of Public Health
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- Tsunoda Tokuko
- Tokyo Metropolitan Institute of Public Health
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- Onuki Aya
- Tokyo Metropolitan Institute of Public Health
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- Okubo Tomoko
- Tokyo Metropolitan Institute of Public Health
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- Igarashi Tsuyoshi
- Tokyo Metropolitan Institute of Public Health
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- Maki Michirou
- Bureau of Social Welfare and Public Health, Tokyo Metropolitan Government
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- Kumano Mari
- Bureau of Social Welfare and Public Health, Tokyo Metropolitan Government
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- Satou Hirokazu
- Bureau of Social Welfare and Public Health, Tokyo Metropolitan Government
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- Konishi Hiroyuki
- Tokyo Metropolitan Institute of Public Health
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- Inomata Akiko
- Tokyo Metropolitan Institute of Public Health
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- Moriyasu Takako
- Tokyo Metropolitan Institute of Public Health
Bibliographic Information
- Other Title
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- 大気PM<sub>2.5</sub>中の硫酸アンモニウム分別定量法の開発
- 大気PM₂.₅中の硫酸アンモニウム分別定量法の開発
- タイキ PM ₂.₅ ナカ ノ リュウサン アンモニウム フンベツ テイリョウホウ ノ カイハツ
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Description
<p>In this study, a separation and quantification method for ammonium sulfate in ambient PM2.5 was developed. Aqueous solutions of four major ammonium salts in PM2.5, i.e., ammonium sulfate, ammonium hydrogen sulfate, ammonium nitrate and ammonium chloride, were added to a quartz fiber filter and dried. Next, the filter was subjected to heat treatment to separate the ammonium sulfate from the other ammonium salts. By heating the filter to 110℃ for 30 min, ammonium nitrate and ammonium chloride volatilized, and only ammonium sulfate and ammonium hydrogen sulfate remained on the filter. Furthermore, by heating the filter to 150℃ for 30 min, the ammonium sulfate splits into ammonium hydrogen sulfate and ammonia, so half of the NH4 in the ammonium sulfate volatilized. The other sulfate salts that were estimated to be present in PM2.5, i.e., sodium sulfate, potassium sulfate and calcium sulfate, did not decrease by the heat treatments at 110℃ and 150℃. Hence, after the heat treatments, the ammonium ion, which decreased by heating at 150℃ compared to heating at 110℃, was confirmed to originate from the ammonium sulfate. Thus the concentration of ammonium sulfate in the PM2.5 was estimated from the decreased ammonium ion concentration and the ratio of the formula weight. Using this developed method, the concentration of ammonium sulfate in ambient PM2.5 was estimated to be 1.8 μg/m3 in January and 2.5 μg/m3 in February, 2018.</p>
Journal
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- Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi
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Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi 53 (6), 207-218, 2018-11-10
Japan Society for Atmospheric Environment
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Keywords
Details 詳細情報について
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- CRID
- 1390282763085065472
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- NII Article ID
- 130007555623
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- NII Book ID
- AN10512108
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- ISSN
- 21854335
- 13414178
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- NDL BIB ID
- 029323153
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL Search
- CiNii Articles
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- Abstract License Flag
- Disallowed