• Journal of the Korean Society of Mineral and Energy Resources Engineers
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• v.55 no.6
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• pp.517-526
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• 2018

In order to remove pollutants from the soil in the Ka-hak mine site, this study investigates optimization of the acid washing conditions for the soil. The soil at the site is presumed to be contaminated by diffused heavy-metal-contaminated tailings. The major heavy metal pollutants in the soil are copper, lead, and zinc. Gravels larger than 5mm in size constitute approximately 38% of the soil, and these are the least polluted by heavy metals. On the other hand, it is difficult to reduce the concentration of heavy metals in fine soils, particularly those whose sizes are less than 0.075 mm. The results of the continuous process using a hydro-cyclone show that fine soil particles consisting of at least 20% of the raw soil must be separated before the chemical soil washing process in order to achieve reliable cleaning.

• 대한예방의학회:학술대회논문집
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• 1995.10a
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• pp.377-378
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• 1995

• Korean Journal of Environmental Agriculture
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• v.25 no.1
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• pp.47-57
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• 2006

This study was carried out to select the Eco-tree for successful phytoremediation of abandoned metalliferous mines. We examined vegetation and heavy metal concentrations of woody plants in abandoned mining areas, and also conducted seed germination and seedling growth experiment on contaminated soils from Gahak and Geumjeong mines. Pinus densiflora, Robinia pseudoacacia, Lespedeza bicolor and Alnus japonica showed high frequency in the survey areas and had high heavy metal concentrations compared to other species. Heavy metal concentrations were higher in roots than in leaves and stems. The seed germination rate was in the order of P. densiflora, L. bicolor, R. pseudoacacia, and Alnus japonica from the incubactor and greenhouse experiment. In the incubator experiment germination rate was highest in the control soil for P. densiflora and A. japonica. Germination rate of P. densiflora was highest on the 100% contaminated soil for Gahak mine while germination rate decreased with increased percentage of contaminated soil for Geumjeong mine. In the greenhouse experiment germination rate was lowest on the 40% contaminated soil for Gahak mine while germination rate was lowest on the 20% contaminated soil for Geumjeong mine and increased with increased percentage of contaminated soil. Shoot growth was highest for L. bicolor while root growth was highest for R. pseudoacacia except for 20% contaminated soil in Geumjeong mine.

• Korean Journal of Soil Science and Fertilizer
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• v.29 no.4
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• pp.424-431
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• 1996

This study was carried out to provide information for establishing counter measures of soil pollution through analysis of Cd. Cu, Pb, and Zn in paddy soils and brown rice. Cadmium, Cu, Pb, and Zn contents in soils were analyzed and distribution maps for these heavy metals were prepared. Heavy metal contents in brown rice were also measured. Average contents of Cd, Cu, Pb, and Zn in surface paddy soils extracted with 0.1 N HCl were 7.4, 35.8, 98.9, and $118.8mg\;kg^{-1}$, respectively. These were 9 times (Cu) to 50 times (Cd) higher than the background level of heavy metals in unpolluted paddy soils in Korea. The contents of Pb and Zn were lower than those measured in 1980, whereas Cd content did not decrease. The levels of heavy metal contamination in paddy soils may not affect growth or yield of rice plant, however, Cd contents indicated a level of serious concern to humans. The average contents of Cd, Cu, Pb, and Zn in brown rice were 0.38, 2.38, 1.31 and $22.31mg\;kg^{-1}$, respectively.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1996.05a
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• pp.15-33
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• 1996

우리나라의 토양은 지형적인 요인과 토양모재 및 기후적인 조건에 의해 토양에 유입되는 유해물질에 대한 보유력이 낮은 특성으로 인해 외부에서 유입되는 유해 중금속에 대하여 취약한 특성을 가지고 있다. 우리나라 토양의 중금속 자연 함유량은 논토양의 경우 Cd 0.13, Cu 4.15, Pb 4.17, Zn 3.95 mg/kg의 수준이며 밭토양은 Cd 함량이 논토양보다 높은 수치를 보인다. 과수토양은 과거에 중금속이 함유된 영농자재가 투입된 결과로 자연함량을 결정하기 힘드며 매우 높은 중금속 농도를 보인다. 그리고 현재 토양환경보전법이 시행되어 중금속류 및 유해유기물에 대한 오염기준을 제시하고 있다. 토양의 중금속 오염현황은 환경부의 토양오염 측정망에서 금속광산, 제련소, 매립지 부근에서 높은 농도를 나타내고 있으며, 산업폐수 및 생활하수가 관개수로 유입되는 논토양에서 중금속 오염이 우려되고 있다. 제련소 및 금속광산 부근의 토양은 거리에 따라 중금속 농도가 감소하는 경향을 보이고 있으나 인접지역에서는 규제농도에 육박하거나 초과하고 있다. 또한 폐광산 부근에서 생산된 현미 역시 전반적으로 작물재배제한 기준를 초과하지는 않으나 상당 지역이 이 기준을 초과하고 있으며 0.1 M HCl로 침출가능한 Cd 함량과 상관관계를 보인다. 이 상관관계에 의하면 0.1 M HCl로 침출가능한 토양 중 Cd의 양이 5 mg/kg 이면 생산된 현미의 Cd 함량이 1 mg/kg을 초과할 확률은 40%인 반면, 일본 식량청 수거대상인 0.4 mg/kg을 초과할 가능성은 100%로 파악된다. 광명시 가학광산 인근 지역을 대상으로 한 중금속 오염에 대한 대책연구에서는 현미 중 Cd 함량이 0.4 mg/kg을 초과할 가능성이 높은 지역(토양 농도 5 mg/kg)은 최소 20 cm 이상 두께로 객토를 하고, 현미 중 Cd 함량이 0.4 mg/kg 을 초과할 가능성이 낮은 지역은 석회, 규산질 비료, 용성인비, 등을 사용하여 중금속의 용해도를 낮추어 작물이행을 경시키는 것이 바람직한 것으로 판단되었다. 그리고 광미사를 현위치에서 처리하는 방안이 제시되었다.

• Korean Journal of Soil Science and Fertilizer
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• v.29 no.4
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• pp.432-438
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• 1996

This study was carried out to prepare information for the establishment of countermeasures for an area contaminated with minewaste from an old zinc mine at Kahak-long in Kwangmyong. Minewaste and bottom sediments from the streams in this area were sampled and were analyzed for Cd, Cu, Pb, and Zn extracted with different solution. Total heavy metal contents in both minewaste and bottom sediments were fairly high. Cadmium and Zn contents in the minewaste and Cd, Cu, Pb, and Zn contents in the bottom sediments extracted with 0.1 N HCl showed a much higher level than those in the background level of paddy soils and in the soils around the other metal mines regardless of the distance from the mine. Sulfide/residue forms of Cd, Cu, Pb, and Zn covered the highest portions for the minewaste. For bottom sediments, sulfide/residue forms of Cu and Zn formed the highest portions, whereas the contents of both carbonate and sulfide/residue forms of Cd and Pb were significant. The lower the pH of the extracting solutions, the more heavy metals extracted from both minewaste and bottom sediments.

• Journal of Soil and Groundwater Environment
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• v.20 no.4
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• pp.83-89
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• 2015

Soil samples collected in an area of Gahak Mine were investigated for the characterization of mineralogical and physicochemical properties of contaminants in soils. It is found that soils in the study area are contaminated by lead (Pb), copper (Cu), zinc (Zn), cadmium (Cd), in which their concentrations are 595.3 mg/kg, 184.9 mg/kg, 712.8 mg/kg, and 10.64 mg/kg, respectively. All the concentrations exceed the concern criteria of Korean standard. Upon distribution patterns of metals identified by the sequential extraction procedure, our results show that more than 50% of metals are found as a residual type, and 30% are accounted for the association of Fe/Mn oxides. Interestingly, XRD results show that minium (Pb₃O₄) and cuprite (Cu₂O) are identified in the soil samples, suggesting that the sources of the contaminants for Pb and Cu are these minerals. In SEM images, tens of µm of Pb oxides and Pb silicate-minerals are observed. We, therefore, note that the contamination of metals in the study area results from the direct influx and disturbance of tailings. Our findings indicate that the characterization of physicochemical and mineralogical properties of contaminated soils is a critical factor and plays an important role in optimizing recovery treatments of soils contaminated in mine development areas.

• Journal of Korean Society of Forest Science
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• v.87 no.3
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• pp.466-474
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• 1998

This study was conducted to evaluate heavy metal concentrations(Cd, Cu, Z, and Pb) in the soil of two zinc mines and to correlate heavy metal contents between the soils and trees growing near the mines. Soils and leaves, stems, and roots of five tree species(Corylus heterophylla, Pinus rigida. Populus alba${\times}$glandulosa, Rhododendron mucronulatum, and Robinia pseudoacacia) were collected from Sambo Zinc Mine located in Hwasung and Gahak Zinc Mine in Kwangmyung city in Kyonggido. Soils near two zinc mines were not seriously contaminated by heavy metals, but Zn and Pb concentrations were at toxic level. The heavy metal concentration in soils decreased in the order of Zn, Pb, Cu, and Cd, and decreased with increasing distance from zinc mining sites. Among the five tree species, Populus alba ${\times}$ glandulosa showed the highest heavy metal concentrations in the tissue except for Pb. Particulars, leaves of the species contained the high concentrations of heavy metals to reach the maximum of 91ppm Zn. The roots of Corylus heterophylla contained high concentrations of Cu and Pb. The order of heavy metal concentrations in the tree species was Zn, Cu, Pb and Cd. The concentration of heavy metals in the tree tissues showed a positive correlation with that in soil in which trees are growing. The ratio of heavy metal concentration of trees to that of soils(concentration factor : CF) was highest in Zn and lowest in Pb. Populus alba${\times}$glandulosa had the highest CF value among the five tree species. It was concluded that Populus alba${\times}$glandulosa, based on the high metal uptake ability, could be used for decontaminating of heavy metals from contaminated soils, and Pinus rigida could be used to reflect the level of contamination in soils.

• Korean Journal of Environmental Agriculture
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• v.20 no.4
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• pp.297-302
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• 2001

To compare the relationship between the vertical distribution of heavy metals in paddy soil and soil pH near four abandoned metal mines, 40 paddy surface soils $(0{\sim}15\;cm)$ and 12 soils with soil depths ($0{\sim}20$, $20{\sim}40$, $40{\sim}60$, $60{\sim}80$ and $80{\sim}100$ cm) were collected. Both total and extractable heavy metal contents in soils were analyzed after acid digestion $(HNO_3:HClO_4:H_2SO_4)$ and 0.1 N-HCl extraction, respectively. The 0.1 N-HCl fraction ratio over total contents of Cd, Cu, Pb, and Zn were 57, 30, 23, and 19% respectively. Vertical distribution of heavy metals varied considerably among the different mines. In Choil mine, there was no difference in concentrations of all the metals with soil layers. However, Cu and Pb contents in Gahak mime were high at $0{\sim}20\;cm$ depth, and Zn was high at $0{\sim}40\;cm$ depth. In Sinyemi mine, Cd and Cu contents were high at $0{\sim}40\;cm$ depth. Cd, Cu, and Pb contents in Okcheon mine were high through all soil profiles up to 100 cm soil depth. The 0.1 N-HCl fraction ratio over total contents of heavy metals with soil layers were very high at $0{\sim}20\;cm$ depth. As soil depth increased, fraction ratio of heavy metals decreased at the high soil pH (Gahak, Sinyemi, and Choil mines). However, the ratios of Cd, Cu, and Pb in Okcheon mine, having a relatively lower soil pH than other sites, were relatively similar through all the soil profiles up to 100 cm soil depth. Therefore, it was estimated that the mobility and availability of heavy metals in soils were affected by soil pH.