• 한국물환경학회지
• /
• 제22권5호
• /
• pp.871-878
• /
• 2006

Batch experiments were performed to evaluate the applicability of soil washing for heavy metal contaminated soils at Nacdong and Hamchang abandoned mines. The texture of the Nacdong soil was sandy loam. Nacdong abandoned mine soil was almost neutral (pH=6.5). Contaminations of As, Cd, Pb and Zn for Nacdong mine soils were 12,900 mg/kg, 29 mg/kg, 696 mg/kg and 276 mg/kg, respectively. Hamchang abandoned mine soils were acidic (pH=2.6) and the soil texture was loam. The contaminations of As, Cd, Pb and Zn for Hamchang abandoned mine soils were 6,410 mg/kg, 291 mg/kg, 1,300 mg/kg and 1,110 mg/kg, respectively. For the Nacdong abandoned mine soils, oxalic acid was found to be the most effective soil washing extracter for As and Pb while citric acid was the most effective extracter for Cd. For the Hamchang abandoned mine soils, oxalic acid showed the highest extraction efficiencies for As and Pb, whilst citric acid presented the best soil washing efficiencie for Cd. Oxalic acid and EDTA were found to be the most effective soil washing extracter for the Hamchang abandoned mine contaminated soils.

• 자원환경지질
• /
• 제37권1호
• /
• pp.87-98
• /
• 2004

청양광산과 서보광산의 광미와 오염된 토양은 5단계 연속추출법을 실시한 후 추출된 중금속 함량을 ICP-AES로 각 단계별로 분석하였다. 청양광산과 서보광산의 광미와 오염된 토양 내 비소와 코발트는 대부분 잔류형태 단계에서 우세하였다. 카드뮴, 구리 및 아연의 경우, 청양광산의 광미는 산화성 형태가 우세한 반면에, 서보광산의 광미는 잔류형태로 안정하였다. 서보광산의 오염된 토양에 함유된 이들 원소는 산화철망간과 수반되었다. 청양광산과 서보광산의 광미 내 함유된 납은 다른 금속에 비해 이온교환형태로 존재하는 함량이 높아 오염 확산의 우려가 있다. 그러나 서보광산의 오염된 토양은 잔류형태로 존재하여 안정하였다.

• 한국토양환경학회지
• /
• 제4권2호
• /
• pp.175-183
• /
• 1999

진곡광산의 광미와 주변 밭과 논의 토양에서의 중금속과 시안의 오염도에 대해 조사하였다. 광미 중의 As, Cd, Cu, Hg, Pb, Zn및 CN￣의 평균농도는 각각 3.94$\times$$10^3$, 14.3, 266, 6,13, 4.07$\times$$10^3$, 2.51$\times$$10^3$, 1.19mg/kg이었고 Kloke가 제안한 허용기준치를 이용한 오염지수는 32~58 이었으며 pH 는 약산성이었다. 토양오염공정시험법에 의한 중금속 농도는 광미와 인접한 일부 토양만을 제외하고는 토양환경보전법의 농경지 우려기준이하였다.

• 자원환경지질
• /
• 제32권1호
• /
• pp.73-82
• /
• 1999

The objectives of this study are to investigate soil contamination in the vicinity of abandoned Au-Ag mine and to apply a remediation technique of liming to tailings. In the study area of the Imcheon Au-Ag mine, soils were sampled in and around the mine the analyzed by Atomic Absorption Spectrometry extracted by both 0.1N HCl and aqua regia. Elevated levels of Cd, Cu, Pb and Zn concentrations extracted by 0.1N HCl were found in soils taken from tailings site. These high contents directly influenced metal concentrations in soils taken in the vicinity of the site. This is mainly due to clastic movement by wind and effluent of mine waste water. In addition, relatively enriched concentrations of the metals were found in soils extrated by aqua regia due to strong decomposition of the samples compared with 0.1N HCl extration. According to the statistical approach, metal concentrations in soils by 0.1N HCl had a positive correlation with those by aqua regia extraction. Mine waste waters and stream waters were also sampled around the mine in spring and summer and analyzed by AAS for Cd, Cu, Pb and Zn, and by Ion Chromatography for anions. Like soils developed over tailings, significant levels of metals and sulphates were found in the mine waste waters ranging of 0.2~0.3, 0.5~2.0, 0.2~2.8, 30~50 and 1,240~4,700 mg/l of Cd, Cu, Pb, Zn and $SO_4^{2-}$, respectively. These elevated levels influenced in the stream waters in the vicinity of the tailings site. In seasonal variation of metal and anion contents, relatively high levels were found in waters sampled on summer due to leaching the metals and anions from tailings by rain. This study also examined the possibility of lime treatment for remediation of acid mine tailings and assumed to be 46 tones of pulverized lime for neutralization of the tailings.

• 한국토양환경학회지
• /
• 제4권1호
• /
• pp.35-47
• /
• 1999

구봉광산의 광미와 주변 밭과 논의 토양 및 하상퇴적물에서의 중금속과 시안의 분포 및 오염도에 대해 조사하였다. 광미 중의 As, Cd, Cu, Hg, Pb, Zn및 CN￣의 평균농도는 각각 6.93$\times$$10^{3}$, 56.9, 209, 5.03, 3.25$\times$$10^{3}$, 1.89$\times$$10^{3}$, 21mg/kg이었고 Kloke가 제안한 허용기준치를 이용하여 계산한 오염지수는 42~95이었으며 pH는 약알칼리성이었다. 광산과 인접한 밭 토양 중의 중금속과 시안 함량은 논 토양보다 높았다. 하상퇴적물 중의 중금속과 시안 함량은 광미 중의 분석치정도로 많이 검출되었다.

• 한국지반환경공학회 논문집
• /
• 제11권2호
• /
• pp.5-11
• /
• 2010

폐광산 주변의 광미장, 폐석더미로 인해 주변 지역의 토양 및 농작물들은 중금속으로 오염 될 수 있다. 본 연구는 주변토양 용도별, 농작물 재배품목별, 광산과의 이격거리별로 분류하여 광산 주변 중금속 오염실태조사를 수행하였다. 갱구인근 지역에서 Zn와 Pb이 토양오염기준치를 초과하였으며 다른 지역에 비해 광미장 지역과 논 경작지 토양의 중금속농도가 비교적 높은 것으로 나타났다. 광산과의 이격거리에 따른 중금속 농도는 갱구에서 거리가 멀어질수록 점차 감소하였다. 토양과 쌀 시료의 중금속 상관관계는 As와 Cd이 상관관계성이 있는 것으로 나타났으나 다른 중금속들은 관계성이 없는 것으로 조사되었다.

• 한국환경과학회지
• /
• 제8권2호
• /
• pp.197-204
• /
• 1999

The extent of heavy metal pollution in agricultural in soils near the abandoned mine land site was investigated using their concentrations from the 47 sampling sites in B mine. Samples were prepared using 0.1N HCI - Korean Standard Methods - and then analysed for Cd, Cu, Pb, As and Cr by Inductively Coupled Plasma Spectrometer. In addition, soil and mine tailing samples were sequentially extracted to investigate the chemical speciation of heavy metals in them. The soils in the vicinity of mining area are highly contaminated by heavy metals ranging up to 5.96mg Cd/kg, 253.3mg Cu/kg, 76.7mg Pb/kg, and 15.45 mg As/kg, according to the analysis of Korean Standard Methods. The heavy metal levels by the sequential extraction are much higher than its level by Korean Standard Methods, and little correlated with each other. Based on the results, it is suggested that the As pollution in agricultural soils near the AMLS should be dealt as of prior significance in establishing reclamation strategies for the area.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제29권1호
• /
• pp.10-17
• /
• 2024

In Korea, the common remedial process for reclamation of agricultural soils nearby abandoned mines involves chemical soil stabilization followed by covering with clean soil. This study investigated the chemical properties of cover soils and the validity of HCl extraction method in assessing the degree of As and heavy metal stabilization in stabilized soils collected from 14 plots where mine reclamation had been completed. The results revealed there were no major differences in contaminants extraction rate between the stabilized soils and contaminated soils, suggesting HCl extraction procedure is a less feasible method to determine the efficiency of the stabilization. Soil quality indicators including OM, SiO₂, P₂O₅, etc. of the land-covering soils were generally lower than those of stabilized soils that used to be the cultivation layer before the stabilization. Nonetheless, the value of those indicators didn't meet the regulatry limits of agricultural soil. Therefore, future strategy for mine reclamation should concentrate not only on contaminant concentration but also on soil quality parameters for agricultural use of the reclaimed soil.

• 환경위생공학
• /
• 제19권1호
• /
• pp.17-23
• /
• 2004

This study was investigated the distribution characteristics of heavy metal concentrations in soils around abandoned mines in Pochon city. The abandoned mines were Youngjung, Yongsog and Pochon. The results were as follows: 1) Heavy metal mean concentrations in minewastes were detected Cr 100.119 mg/kg, Cu 189.400 mg/kg in Youngjung mine, Cr 198.440 mg/kg, As 160.480 mg/kg in Yongsog mine and Cr 84.680 mg/kg, Zn 50.280 mg/kg in Pochon mine. 2) The mean concentrations in soils which is around mines were Cu 62.351 mg/kg in Youngjung mine, and As 95.024 mg/kg, Hg 11.279 mg/kg in Yongsog mine. All materials in Pochon mine were detected low level. 3) The concentrations of heavy metal showed low or not detected in water system (groundwaters, streams and sediments).

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 추계 학술발표회
• /
• pp.1647-1654
• /
• 2008

The characteristics of arsenic(As) contamination were investigated on soils of 3 abandoned metal mine sites in Gangwon-do, Korea. Total forty nine soils were sampled to conduct standard methods(extraction by 1HCl), sequential extraction and column leaching test. Concentration of As extracted by 1N HCl was ordered as follows: A mine > B mine > C mine, and the concentration of arsenic in the soils of A mine was significantly greater than that at any other cases and all samples of A mine were exceeded the national regulation of $6mg \;kg^{-1}$. In the results of sequential extraction, the potential contamination risk for groundwater and plants was ordered as follows: C mine > B mine > A mine because the C mine showed the relatively greater mobility and bioavailability of fraction than any other mines. And, in colume test, concentration of As was ordered as follows: C mine > B mine > A mine, and it was expected that these results were connected with fraction characteristics of the mine sites. Therefore adequate leaching investigations should be used to simulate the effect of natural leaching conditions, and to predict both the potential mobility of metals to groundwater and their bioavailability to plants under natural conditions.