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Agricultural Potential of Granulated Artificial Zeolitic Soils
Seung-Han Hwang(황승한),Jeong-Hun Jang(장정훈),Jae-Deok Seo(서재덕),Man Park(박만) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Artificial soils are used in various industrial fields such as architecture, landscaping, and crop cultivation. However, their physical and chemical properties need to be improved for practical crop cultivation. Incorporation of zeolites has been recommended due to high water holding capacity and cation exchange capacity. In this study, granulation of zeolite-kaolinite mixture with acidified k-silicate has been attempted by disk rotary method. The physical and chemical characteristics of the granulated artificial soil were evaluated along with radish and carrot cultivation. Acidity, CEC and EC of the artificial soil were pH 5.5, 28.5 cmolc/kg and 1800 dS/m respectively. There were no harmful effects on seedling and no significant differences between typical soil and artificial zeolitic soil in overall growth status. As a result, this study showed the mass production process and utilization of artificial zeolitic soil capable of crop cultivation, and further research will be needed to develop the artificial zeolitic soil more suitable for enhanced crop cultivation.
제주도 고산지역 여름철 저농도 이산화탄소의 발생원인과 이동경로에 관한 연구
강경식(Kyeoung-Sik Kang),문일주(Il-Ju Moon),황승만(Seung-Man Hwang),신동석(Dong-Suk Shin),윤순창(Soon-Chang Yoon) 한국기상학회 2010 대기 Vol.20 No.3
This study investigates the generation and movement of low-concentration CO₂ observed in Gosan during summer from 2002 to 2006. For analysis, additional CO₂ data in Anmyeondo, Ryori, Barrow, and Minamitorishima as well as NOAA/ESRL daily global CO₂ fields, background trajectories data, and 850 hPa wind fields are also used. Based on analyses using various observed data, we classified three types of low-concentration CO₂ in Gosan according to its origin: ⅰ) the origin of the Siberian continental, in which the consumption of CO₂ is active due to photosynthesis from broad forests, ⅱ) the origin of Okhotsh and Artic seas, in which the low-concentration CO₂ is dominant due to high primary productivity by a plankton bloom, and ⅲ) the origin of the Northwestern Pacific which is related to the entry of air mass from high latitudes. These results show that the low-concentration CO₂ observed in Gosan during summer is not originated from the Pacific oceans as known in previous studies, but originated from high latitude regions such as the Siberian continental and the Okhotsh and Artic seas.
Ho-Joong Kim(김호중),Jin-Woo Jeon(전진우),Tuyet Nam Thi Nguyen,Seung-Man Hwang(황승만),Yong-Ho Cha(차용호),Sung-Deuk Choi(최성득),Chang-Gyun Kim(김창균) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/DFs) are generated unintentionally from anthropogenic emission sources such as power plants and incinerators, and various kinds of chlorinated chemical manufacturing processes such as metallurgy, pentachlorophenol, ethylene dichloride, and chloroalkyl. In the long-term nationwide Korea national POPs monitoring program, concentrations and emission of PCDD/DFs in the air had been decreased 70 % from 2009 to 2017 and 91% from 2001 to 2015, respectively. Despite these efforts, PCDD/DFs have been long-range transported all over the world due to their characteristics such as low water solubility, semi-volatility, bio-accumulation, and persistence. Especially, air and soil play a key role in the movement and storage of POPs in the environment by deposition and volatilization, evaluating their multimedia fate is essential to predict human health effects. This study focused on long-term fugacity flux based on seasonal variations and types of localities over a decade, as South Korea has a distinctive four seasons; spring, summer, fall, and winter, and various kinds of manufacturing industries. Total 1,083 of ambient air and soil samples at 21 sites where adjacent within 6 km of each other throughout the South Korea peninsula from 2008 to 2018 for PCDD/DFs. It is known that POPs could be re-volatilized from soil to ambient air as secondary pollution. The diffusive soil-air fluxes and soil-air fugacity fraction (ff) of each PCDD/DFs congeners were calculated for every four seasons. The ff is shown that temporal variation according to the number of chlorinations, congeners, and locality types. Furthermore, soil-air fugacity exchange flux over a decade shows that mainly equilibrium state but the tendency to deposition.