Nam-Chul Oh

In this paper, we studied one of the largest coal mines in Mongolia, the Baganuur Coal Mine, in terms of environmental sustainability related to mining practices, with a focus on discharged water and waste sediments. The present quality and potential for future pollution were assessed. Based on World Health Organization and Mongolian guidelines, groundwater pumped from the mining operations could be used for drinking and domestic purposes. In addition, based on the Na absorption ratio, groundwat

Ulaanbaatar (UB), the capital of Mongolia, is one of the fastest-growing cities in the developing world. Due to increasing demand driven by rapid population and industrial growth, sustainable water resource management is required. Therefore, we investigated sustainability in UB from the perspective of water quality. During five sampling campaigns, we collected 135 water samples (58 from bedrock wells, 44 from shallow wells tapped into the alluvial aquifer, 24 from rivers, and 9 from springs). Th

Dimethylmonothioarsinic acid (DMMTA V ) is a highly toxic, thiolated analogue of dimethylarsinic acid (DMA V ). In comparison, a further thiolated analogue, dimethyldithioarsinic acid (DMDTA V ), and DMA V both exhibit lower toxicity. To understand the environmental conditions responsible for forming DMMTA V, the kinetics of DMA V thiolation are examined. The thiolation of DMA V is pH-dependent and consists of two consecutive first-order reactions under excess sulfide conditions. The first thiol

When groundwater drought occurs, baseflow discharges to surface-water bodies will be reduced and then domestic and agricultural water usage becomes at risk of insufficient supply. Thus, in this study, several methods for groundwater drought assessment were tested with long-term monitoring water-level data in the study area to preserve groundwater sustainability from drought, principally caused by reduced precipitation and propagated through agricultural drought and groundwater drought. Because o