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ISSN : 1225-6692(Print)
ISSN : 2287-4518(Online)
Journal of the Korean earth science society Vol.34 No.7 pp.681-692
DOI : https://doi.org/10.5467/JKESS.2013.34.7.681

인공 분기공 가스를 이용한 Giggenbach bottle 법의 평가

이상철1 ·강정천1 ·윤성효2·정훈영1,*
1부산대학교 지질과학과, 609-390, 부산광역시 금정구 부산대학로 63번길 2
2부산대학교 지구과학교육과, 609-390, 부산광역시 금정구 부산대학로 63번길 2
본 연구에서 인공 분기공을 이용해 Giggenbach bottle 법의 적정성을 평가하고, 관련된 전처리 및 분석기술을 확립했다. 인공 분기공은 CO2, CO, H2S, SO2, H2, CH4, HCl, HF, N2의 조합으로 이루어졌고, 각 성분의 유속을 조절해 다양한 조성을 지닌 분기공 가스를 만들었다. 분기공 가스는 NaOH 포집용액이 담긴 병을 사용해 채취했다. CO, H2, CH4의 비용존 가스는 채취병의 빈 공간에 축적되고, CO2, SO2, HCl, HF의 산성가스는 포집용액에 용해된다. H2S는 다른 산성가스처럼 포집용액에 용해되나, 카드뮴 아세테이트를 첨가한 경우 Cd2+와 반응해 CdS로 침전된다. 비용존가스는 가스 크로마토그래피를 사용해 분석했다. 한편 포집용액에 생긴 CdS 침전물은 여과장치를 사용해 수용액과 분리시킨 후, H2O2 수용액과 반응시켜 CdS 침전물에 결합되어 있는 황화염을 황산염으로 산화시켰다. 또한 침전물이 분리된 포집용액에 H2O2 용액을 넣어 아황산염을 황산염으로 산화시켰다. 이런 전처리를 거친 시료는 이온 크로마토그래피를 사용해 분석했다. 포집용액에 용존된 CO2는 전처리 없이 총유기-무기탄소분석기를 사용해 측정했다. 측정된 화산가스의 농도는 인공 분기공에서 설정된 유속과 비례했고, 이는 Giggenbach bottle 법이 화산가스 관측에 유용하게 적용될 수 있음을 나타낸다. 또한 본 연구에서 제시된 전처리 및 분석법은 화산가스 측정의 정확도 및 재현성을 향상시킬 것으로 기대된다.

Evaluation of the Giggenbach Bottle Method with Artificial Fumarolic Gases

*Corresponding author: hjeong@pusan.ac.kr

*Tel: +82-51-510-2249

*Fax: +82-51-517-6389
, Sangchul Lee1, Jungchun Kang1, Sung Hyo Yun2,and Hoon Young Jeong1,*

1Department of Geological Sciences, Pusan National University, Busan 609-735, Korea
2Department of Earth Science Education, Pusan National University, Busan 609-735, Korea

Abstract

We aimed to evaluate the effectiveness of the Giggenbach bottle method and develop the related pretreatmentand analytical methods using artificial fumarolic gases. The artificial fumarolic gases were generated by mixing CO2, CO,H2S, SO2, H2, and CH4 gas streams with a N2 stream sparged through an acidic medium containing HCl and HF, withtheir compositions varied by adjusting the gas flow rates. The resultant fumarolic gases were collected into an evacuatedbottle partially filled with a NaOH absorption solution. While non-condensible gases such as CO, H2, and CH4accumulated in the headspace of the bottle, acidic components including CO2, SO2, HCl, and HF that were dissolved intothe alkaline solution. Like other acidic components, H2S also dissolved into the solution, but it reacted with dissolvedCd2+ to precipitate as CdS when Cd(CH3COO)2 was added. The non-condensible gases were analyzed on a gaschromatography. Then, CdS precipitates were separated from the alkaline solution by filtration, and they were pretreatedwith H2O2 to oxidize CdS-bound sulfide into sulfate. In addition, a portion of the solution was also pretreated with H2O2to oxidize sulfite to sulfate. Following the pretreatment, the resultant samples were analyzed for SO42−, Cl− and F− on anion chromatography. In the meanwhile, dissolved CO2 was analyzed on a total organic carbon-inorganic carbon analyzerwithout such pretreatment. According to our experimental results, the measured concentrations of the fumarolic gases wereshown to be proportional to the gas flow rates, indicating that the Giggenbach bottle method is adequate for monitoringvolcanic gas. The pretreatment and analytical methods employed in this study may also enhance the accuracy andreproducibility of the Giggenbach bottle method.

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