• Korean Journal of Soil Science and Fertilizer
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• v.43 no.5
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• pp.674-683
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• 2010

The current study was performed to examine the agricultural suitability of the cultivated upland nearby abandoned mining areas in Korea using three different scientific risk assessment models of Korea, USA and UK. For this, three mining sites DM, MG and KS were selected among 687 abandoned mines through preliminary risk assessment. A wide range of parameters were obtained through analysis of both soil and crop samples from the selected areas for heavy metal concentration and questionnaires to the communities along with the selected mining sites. Heavy metal concentration in soil samples was lower than the values previously reported by the Ministry of Environment (ME, 2002). However, both As and Cd concentration in the soil samples exceeded the concern level for agricultural area of the Soil Environment Conservation Act. Judging from the contaminant criteria for the crops, only Zn level in pepper, soybean and corn from the mining area DM exceeded the criteria whereas As, Cd, $Cr^{6+}$, Cu, Hg, Ni, Pb did not exceed the criteria. It was demonstrated that there would be human health risk by Pb accumulated in crops from both mining areas MG and KS when estimated by the risk assessment models of Korea and USA. Against it, results of the risk assessment model of UK showed human health risk by Pb in the crops from all study areas.

• Korean Journal of Environmental Agriculture
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• v.14 no.3
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• pp.253-262
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• 1995

The heavy metal contents of soils which had been contaminated with mine residues and green onion and lettuce which were grown on these soils were analyzed. The results obtained are summarized as follows: 1. Heavy metal contents in the soil where green onion and lettuce died back or were poor in growth were unusually high. 2. Heavy metal contents in the plants grown in the soil of high level of metals were also high, in the order of root > leaf > stem. In case of Mn, however, the content was the highest in the leaf. 3. Contents of Cd, Cu, Zn and Ni in soil were positively correlated with those in plant. In case of Pb, there was no consistent relationship between the contents in soil and plant. 4. Even in the soils where plant growth appeared to be normal the heavy metal contents both in soil and in plant were higher than the national average.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.11a
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• pp.475-478
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• 2006

부산 일부지역 토양의 중금속 오염과 농작물로의 전이에 의한 중금속 오염을 측정하고자 산분해에 의한 함량분석을 실험하였다. 대상지역 토양의 pH는 $5.62{\sim}6.71$의 범위였으며, 평균 중금속 함량은 $0.05{\sim}19.39ppm$의 범위에서 Mn(13.82ppm)>Zn(8.33ppm)>Pb(2.89ppm)>Cu(0.99ppm)>Cd (0.07ppm)의 분포로 나타났고, 조사대상 중금속의 토양중의 함량은 모두 Clarke수보다 작은 값으로 측정되어 오염도가 낮은 상태였다. 농작물에는 Cd(0.04ppm)$Pb\;6.6%{\sim}Zn\;87.6%$의 범위였다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.04a
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• pp.299-301
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• 2003

광미와 오염된 토양에 함유되어 있는 중금속 원소는 존재형태에 따라서 환경에 미치는 영향의 차이가 있다. 그러므로 중금속 원소의 존재형태를 규명하여 물리화학적 환경변화에 따른 중금속의 거동을 예측하고자 Tessier et al. (1979)의 방법을 이용하여 연속추출을 수행하였다. 청양광산과 서보광산의 광미를 비교하면, As와 Co는 두 광산 모두 잔류형태로 안정화되었다. Cd과 Zn은 서보광산의 광미가 청양광산의 광미보다 잔류형태가 더 우세하였다. Pb는 서보광산의 광미가 양이온교환형태로 존재하는 함량이 높고 청양광산의 광미도 양이온교환과 탄산염광물의 형태로 존재하는 함량이 높아 오염 확산의 우려가 있다. 서보광산의 오염된 토양의 경우, As, Co, Cd, Cu및 Zn는 대체로 안정한 형태였으나, Pb는 산화환경에서 불안정한 형태로 존재하였다.

• Economic and Environmental Geology
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• v.53 no.5
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• pp.517-528
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• 2020

The objectives of this study were to select optimal soil amendments through analysis of heavy metal availability in soil and uptake to Miscanthus sinensis Anderss. for phytostablization in heavy metal contaminated soil of abandoned metal mine. M. sinensis was cultivated for 6 months at contaminated soil with several soil treatments (bottom ash 1 and 2%, fly ash 1 and 2%, waste lime+oyster 1 and 2%, acid mine drainage sludge (AMDS) 10 and 20%, compost 3.4%, and control). The analysis results of heavy metal concentrations in the soil by Mehlich-3 mehthod, growth and heavy metal concentrations of M. sinensis showed that AMDS 20% was more effective than other amendments for phytostablization, and AMDS 10% showed second effectiveness. Waste lime+oyster, bottom ash and fly ash were also improved compared to control. Mobility of some heavy metal was increased by treatments. Therefore, it is necessary of preparatory investigation of soil condition to select soil amendment to apply on-site phytostablization.

• Economic and Environmental Geology
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• v.35 no.6
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• pp.553-565
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• 2002

Seasonal variations in vertical distributions of metals were investigated in the contaminated paddy soils around Siheung Cu-Pb-Zn and Deokeum Au-Ag mines. Geochemical behavior of metals was also evaluated with respect to redox changes during the cultivation of rice. Two microcosms simulating the rice-growing paddy field were set up in the laboratory. The raw paddy soils from two sites showed differences in mineralogy, metal concentrations and gecochemical parameters, and it is suggested that high proportions of exchangeable fractions in metals may give high dissolution rates at Deokeum. In both microcosms of Siheung and Deokeum, redox differences between surface and subsurface of paddy soils were maintained during the flooded period of 18 weeks. Siheung soil had neutral to alkaline pH conditions, while strongly acidic conditions and high Eh values were found at the surface soil of Deokeum. The concentrations of dissolved Fe and Mn were higher in the subsurface pore waters than in interface and upper waters from both microcosms, indicating reductive dissolution under reducing conditions. On the contrary, dissolved Pb and Zn had high concentrations at the surface under oxidizing conditions. From the Siheung microcosm, release of dissolved metals into upper waters was decreased. presumably by the trap effect of Fe- and Mn-rich layers at the interface. However, in the Deokeum microcosm, significant amounts of Pb and Zn were released into upper water despite the relatively lower contents in raw paddy soil, and seasonal variations in the chemical fractionation of metals were observed between flooded and drained conditions. Under acidic conditions, rice may uptake high amounts of metals from the surface of paddy soils during the flooded periods, and increases of exchangeable phases may also increase the bioavailability of heavy metals in the drained conditions.

• Korean Journal of Environmental Agriculture
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• v.25 no.4
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• pp.331-338
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• 2006

Coal combustion fly ash, which has a high available Si content and alkaline pH, was selected as a potential source of soil amendment in this study. Two field experiments were carried out to evaluate the possibility of heavy metal accumulation in silt loam (Pyeongtaeg series) and loamy sand (Nagdong series) of rice (Oryza sativa) paddy soils to which 0, 40, 80, and $120Mg\;ha^{-1}$ of fly ash were added. Rice yields increased significantly with fly ash application and the highest rice yields were achieved following the addition of around $90Mg\;ha^{-1}$ fly ash. Fly ash increased the soil pH but did not increase heavy metal uptakes of rice and heavy metal concentration in soils, due to very low concentration of heavy metals in the selected fly ash. Labile fraction of heavy metals (exchangeable + acidic fraction) was scarcely contained and most of them were stable and unavailable form (oxidizable and residual fraction). In conclusion fly ash could be a good supplement to an inorganic soil amendments without heavy metal contamination in paddy soils.

• Ecology and Resilient Infrastructure
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• v.7 no.1
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• pp.63-71
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• 2020

Various types of amendments have been studied for heavy metal stabilization in soil. However, researches on the effect of amendments on alkali soil and their effects on the plants at various edible parts are insufficient. The aim of this study was to evaluate the stabilization efficiency of heavy metals and their transfer into edible parts of food crops. Abandoned mine area was selected and 3 types of amendments (lime stone, LS; steel slag, SS; acid mine drainage sludge, AMDS) was applied with 3% (w/w). in field. After 6 month aging, Chinese cabbage (leafy), bok choy (leafy), garlic (root) and red pepper (fruit) were transplanted and cultivated. For chemical assessment, total concentration and bioavailability using Mehlich-3 solution were determined. For biological assessment, fresh weight and heavy metal uptakes were analyzed. It was revealed that AMDS reduced bioavailability most effectively, resulting in the decrease in heavy metal concentration in edible parts of all crops. When explaining the heavy metal uptake of plants, the bioavailability was more appropriate than the total contents of soil heavy metals. Therefore, bioavailability-based further research and management practices should be carried out continuously for the sustainable environment management, safe crop production, and human health risk reduction.

• Korean Journal of Soil Science and Fertilizer
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• v.38 no.5
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• pp.238-246
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• 2005

We conducted this investigation to observe competitive adsorption phenomena among the heavy metals onto the available sorption sites of soil particle surfaces in sandy clay loam and clay soil collected from Nonsan city, Chungnam and Yoosung, Daejeon in Korea, respectively. Polluted and contaminated soils can often contain more than one heavy metal species, resulting in competition for available sorption sites among heavy metals in soils due to complex competitive ion exchange and specific sorption mechanism. And the adsorption characteristics of the heavy metals were reported that the selectivity for the sorption sites was closely related with electropotential and electro negativity carried by the heavy metals. The heavy metals were treated as single, binary and ternary systems as bulk solution phase. Adsorption in multi-element system was different from single-element system as Cr, Pb and Cd. The adsorption isotherms showed the adsorption was increased with increasing equilibrium concentrations. For binary and ternary systems, the amount of adsorption at the same equilibrium concentration was influenced by the concentration of individual ionic species and valence carried by the respective heavy metal. Also we found that the adsorption isotherms of Cd and Pb selected in this experiment were closely related with electronegativity and ionic potential regardless number of heavy metals in solution, while the adsorption of Cr carried higher valance and lower electro negativity than Cd and Pb was higher than those of Cd and Pb, indicating that adsorption of Cr was influenced by ionic potential than by electronegativity. Therefore adsorption in multi-element system could be influenced by electronegativity and ionic potential and valance for the same valance metals and different valance, respectively. But it still needs further investigation with respect to ionic strength and activity in multi-element system to verify sorption characteristics and reaction processes of Cr, especially for ternary system in soils.

• Journal of Soil and Groundwater Environment
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• v.10 no.3
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• pp.1-8
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• 2005

Fractional compositions and leaching potentials of Cd, Cu and Zn were investigated in the soils which had been disposed with the metal processing wastes, tungsten mine tailings and low quality coal mine area. Total concentrations of metals in these soils were higher than in non-polluted paddy and upland soils. Fractions of Cd, Cu and Zn were mostly reducible, organic and residual forms, but varied with origins of wastes. Residual fraction was a predominant form in the nonpolluted soils. Leaching potentials of metals were higher in polluted soils than in non-polluted soils. Metals leached were higher at pH 4.0 than 7.0 and increased with the duration time. After 25 to 35 hrs, metals released from soils reached a pseudoequilibrium. Leaching potential of metals in non-polluted soils was low due to high percentage of residual fractions.