Long-Term and Mobile Monitoring of Atmospheric Sulfur Dioxide and Hydrogen Sulfide at Mt. Aso and Kumamoto City

OHIRA Shin-Ichi, AZAD Md. Abul Kalam, KURAOKA Rika, TANAKA Takayoshi, MORI Kotaro, TODA Kei

doi:10.2116/bunsekikagaku.55.109

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阿蘇山及び熊本市における大気中二酸化硫黄及び硫化水素の長期モニタリングとモバイル調査
アソサンオヨビクマモトシニオケルタイキチュウ 2サンカイオウオヨビリュウカスイソノチョウキモニタリングトモバイルチョウサ

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Abstract

Flow analysis was applied to atmospheric analyses, and its usefulness and reliability were examined through a long-term measurement. The analysis system was comprised of small diffusion scrubbers and homemade fluorescence and conductivity detectors to measure H₂S and SO₂. The systems were settled in Kumamoto city and Mt. Aso, and the gases were monitored for two and a half years. We also brought this system to Aso crater, to walk around with, and investigated the gas distributions. Based on the gas data obtained at the two locations, the gas behaviors were investigated. The daily variations of SO₂ and H₂S were opposite, and the effects from the wind of the two gases were also different. The volcanic activity greatly affected the gas levels. In the active period, the SO₂ gas level and the gas ratio of SO₂/H₂S became high. Near the fumaroles, the gas levels changed by 3 or 4 orders in a very short time. At 1 km downstream of the wind from the crater, the H₂S ratio was much lower, which indicated that H₂S decomposition occurred in a short time.<br>

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BUNSEKI KAGAKU

BUNSEKI KAGAKU 55 (2), 109-115, 2006

The Japan Society for Analytical Chemistry

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Long-Term and Mobile Monitoring of Atmospheric Sulfur Dioxide and Hydrogen Sulfide at Mt. Aso and Kumamoto City

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