Rak-Hyeon Kim

Application of cluster analysis for the hydrogeochemical factors of saline groundwater in Kimje, Korea

The main hydrogeochemical characteristics of shallow groundwater in the coastal area at Kimje city, Korea, have been identified in the present study. From cluster analysis, the groundwater in the study area is classified into four groups (A, B, C, and D). Groundwaters in B, C, and D groups are strongly affected by the present seawater and the trapped old seawater because the area including B, C, and D groups contacts the Yellow Sea and contains the reclaimed land. They also are governed by reduction processes. On the other hand, groundwater in group A has been largely affected by chemical fertilizers because its land has been used for the agricultural activities for a long time. As groundwater flows from group A to group D according to its path, the governing factor of the groundwater quality gradually tends to change from chemical fertilizers into reduction processes and seawater intrusion.

A Review on Identification Methods for TCE Contamination Sources using Stable Isotope Compositions

This study was performed to summarize application of δ 13 C, δ 37 Cl and δD of trichloroethylene (TCE) to studies on environmental forensic field regarding identification of TCE sources and evaluation of contribution of TCE to groundwater using data collected from literatures. δ 13 C, δ 37 Cl and δD of TCE give some information regarding sources of TCE because they show specific value according to manufacturing method. Also, TCE do not show a significant isotopic fractionation owing to adsorption and dilution. The isotopic fractionation mainly occurs by biodegradation. In addition, isotopic fractionation factor for TCE is different according to a kind of microorganism participated in biodegradation. However, the isotopic data of TCE have to be applied with chemical compositions of TCE and other hydrogeologic factors because isotopic fractionation of TCE is influenced by various factors.

Characteristics of Fe Reduction Process of Shallow Groundwater in a Reclaimed Area, Kim-je

Department of Soil and Groundwater, Environmental Management Corporation, Incheon, 404-708, Korea The study area is located on the western coastal region of Korea, partly had been reclaimed lands. Groundwatersof the coastal area show lower Eh and DO values (Eh: 0.57 V→ 0.13 V, DO; 9.7 mg/l→ 1.3 mg/l), and higher Feconcentrations (> 20 mg/l) than those of the inner land (< 0.3 mg/l), indicating that the redox condition of ground-water changes from oxic into suboxic/anoxic conditions as it flows from the inland toward the coastal area. In addi-tion, Fe speciation of groundwater from the coastal area demonstrates that the most dissolved Fe exist as Fe