To understand the characteristics of vanadium leaching from soils formed by the weathering of basalts, paleo soil at Gosan, Jeju Island, Korea, and several present-day soils from neighboring areas were collected. Leaching experiments were carried out by two approaches: 1) batch experiments under various geochemical conditions (redox potential (Eh) and pH) and 2) continuous leaching experiments under conditions similar to those of natural environments. From the batch experiments, leached vanadium concentrations were highest under alkaline (NaOH) conditions, with a maximum value of 2,870 μg/L, and were meaningful (maximum value, 114 μg/L) under oxidizing (H2O2) conditions, whereas concentrations under other conditions (acidic-HCl, neutral-NaHCO3, and reducing-Na2S2O3) were negligible. This indicated that the geochemical conditions, in which soil-water reactions occurred to form groundwater with high vanadium concentrations, were under alkaline-oxidizing conditions. From the continuous leaching experiments, the pH and leached vanadium concentrations of the solution were in the ranges of 5.45 5.58 and 6 9 μg/L, respectively, under CO2 supersaturation conditions for the first 15 days, whereas values under O2 aeration conditions after the next 15 days increased to 8.48 8.62 and 9.7 12.2 μg/L, respectively. Vanadium concentrations from the latter continuous leaching experiments were similar to the average concentration of groundwater in Jeju Island (11.2 μg/L). Furthermore leached vanadium concentrations in continuous leaching experiments were highly correlated with pH and Al, Cr, Fe, Mn and Zn concentrations. The results of this study showed that 1) alkaline-oxidizing conditions of water-rock (soil) interactions were essential to form vanadium-rich groundwater and 2) volcanic soils can be a potential source of vanadium in Jeju Island groundwater.

Abstract
 1. 서 론
 2. 실험 재료 및 방법
  2.1. 시료 채취 및 전처리
  2.2. 실험 방법
 3. 결과 및 고찰
  3.1. 현무암 및 토양 시료의 화학조성
  3.2. 현무암질 토양의 회분식 용출실험 결과
  3.3. 이산화탄소 및 공기 폭기 조건에서의 현무암질토양의 연속식 용출실험 결과
 4. 결 론
 감사의 글
 REFERENCES

• 감상규(제주대학교 환경공학과, Department of Environmental Engineering, Jeju National University) | Sang-Kyu Kam Corresponding author
• 이민규(부경대학교 화학공학과, Department of Chemical Engineering, Pukyong National University) | Min-Gyu Lee
• 김호림(고려대학교 지구환경과학과 및 KU-KIST 그린스쿨대학원, Department of Earth and Environmental Sciences and KU-KIST Green School, Korea University) | Horim Kim
• 윤성택(고려대학교 지구환경과학과 및 KU-KIST 그린스쿨대학원, Department of Earth and Environmental Sciences and KU-KIST Green School, Korea University) | Seong-Taek Yun
• 양철신(제주특별자치도 보건환경연구원, Research Institute of Health & Environment, Jeju Special-Governing Province) | Cheol-Shin Yang
• 현익현(제주특별자치도 보건환경연구원, Research Institute of Health & Environment, Jeju Special-Governing Province) | Ik-Hyun Hyun