담양지역 음용지하수 중에 함유 되어 있는 Mn 함량의 계절적 변화와 지구화학

Abstract

The purpose of this study is to examine the level of manganese concentration by season in groundwater in which manganese concentration exceeds the permitted level in Damyang area. Ground water was procured each month to document changes in ion content by season, piper diagram was used to determine the type of water, and the changes in Eh-pH diagram and saturation index were discovered to make the prediction of Mn sedimentation. Also, by analyzing changes in manganese content by season, change in water quality was documented and the reason for Mn incubation was identified. To examine Mn concentration by month, Go-Seo Myeon area recorded 0.01mg/l in March and April showing increase to 0.08mg/1 in October. Mujeong Myeon area recorded 5.12mg/1 in November indicating higher concentration level of manganese than samples from other areas. Regarding correlation between manganese concentration and precipitation in Goseo and Mujeong area, the lower the precipitation was, the higher the manganese concentration level was. When precipitation is high, it oxidize the groundwater environment leading to lower level of manganese and when precipitation is low, it sucks the air out of the groundwater environment leading to higher level of manganese. When precipitation is high creating lots of air in the environment, high NO3 is observed, whereas Mn existing in the form of Mn+3 or Mn+4 produces low Mn concentration. When precipitation is low, however, NO-13 transforms into N2 through denitrification while consuming oxygen, leaving the environment short of oxygen. To this end, Mn dissolves into Mn+2 causing high concentration of Mn in the water.