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The objective of this study is to investigate the geochemistry of groundwater and its formed in scale at Chosun University area. Groundwater sample and scale sample were collected at the Chosun University. The pH values of groundwater ranges from 6.27 to 6.66, and the Fe content are relatively small in the range from 0.01 mg/l to 0.02 mg/l. The content of Cl and Br were significantly enriched in groundwater, because those ions tend to behave conservatively when ionized in groundwater by human activity. Even though in small Fe content, the groundwater is oversaturated with respect to goethite, hematite and magnetite. The composition of the scale (powdered sample) consists mainly of Fe2O3 (68.91 wt% ~ 77.79 wt%), SiO2, (5.08 wt% ~ 10.71 wt%) and S (0.23 Wt% ~ 0.68 Wt%). The Fe2O3 content in scales (polished section) range from 63.72 wt% to 85.29 wt% and the SiO2 content range from 3.03 wt% to 9.8 wt%. The content of negative charged species in groundwater such as SO3 (0.25 wt% ~ 0.88 wt%), Cl (0.01 wt% ~ 0.25 wt%) and P2O5 (max. 0.92 wt%) were relatively high in scales (polish section) due to goethite with point of zero charge (PZC). The x-ray powder diffraction studies identified that red and yellow color scales were well crystallized goethite, and green color scale were malachite, cuprite, quartz and microcline. IR absorption bands of goethite were found from OH stretching, OH deformation and FeO stretching vibration bands. In the SEM and EDS analysis, iron-oxidizing bacteria, helically stalked Gallionella and sheathed Leptothrix species were identified in groundwater samples and scales. The micro-goethite and the framboid structure of goethite were precipitated in twisted stalk Gallionella and sheathed Leptothrix surface.
조선대학교의 지하수 공에서 형성된 스케일에 대하여 지구화학적 특성을 규명하고자 하였다. 지하수에서 pH 범위는 6.27에서 6.66, Fe 이온 함량은 0.01 mg/l에서 0.02 mg/l으로 나타난다. Cl과 Br 함량이 지하수에서 상당히 부화되어 나타나는데 이와 같은 원인은 인간의 활동으로 지하수에 유입된 이들 이온들이 보존성 거동 특성을 보이기 때문이다. Fe 함량이 미량임에도 불구하고, 침철석, 적철석 및 자철석에 대한 포화지수가 과포화로 나타난다. 미분쇄된 스케일은 Fe2O3(68.91 wt% ~ 77.79 wt%), SiO2,(5.08 wt% ~ 10.71 wt%) 및 S(0.23 Wt% ~ 0.68 Wt%)로 구성되어 있다. 연마편으로 제작된 스케일에서 Fe2O3 함량은 63.72 wt%에서 85.29 wt%, SiO2 함량은 3.03 wt%에서 9.8 wt%로 나타난다. 연마편에서 SO3(0.25 wt% ~ 0.88 wt%), Cl(0.01 wt% ~ 0.25 wt%) 및 P2O5(max. 0.92 wt%)등이 비교적 높은 함량을 보이는데 이러한 원인은 침철석의 PZC(point of zero charge)로 인해 지하수에서 음전하를 띄는 이들 이온들이 침철석에 흡착되기 때문이다. 적갈색의 스케일에 대하여 XRD분석 결과 침철석이 동정되었으며, 초록색 스케일은 공작석, 적동석, 석영 및 미사장석이 나타난다. IR 분석에서 침철석에 해당되는 OH 신축진동, OH 굽힘진동 및 FeO 신축진동 흡수밴드가 관찰된다. SEM 및 EDS 분석에서 철박테리아에 해당되는 나선형 구조의 Gallionella 종과 협막를 형성하는 Leptothrix 종이 지하수와 스케일 시료에서 관찰된다. 미세한 침철석과 포도송이 구조의 침철석들이 나선형 구조의 Gallionella 표면에 그리고 협막을 형성하는 Leptothrix 표면에 침전되어 있다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 44
- No :5
- Pages :392-410
Journal of the Korean Society of Mineral and Energy Resources Engineers
