• Journal of Applied Biological Chemistry
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• 제51권1호
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• pp.36-44
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• 2008

Organic forms of arsenic (As) were determined through fractionation procedure of soil organic matter (SOM) in soil, sediments and mine tailing samples from the Myungbong, Dongil, and Okdong mining areas of southern Korea. An alkaline extraction method was applied to soil samples followed by the fractionation procedures of SOM by the DAX-8 and XAD-4 resin adsorption method. Major fraction of organic As species (42% to 98%) was found in acid-soluble fraction, whereas minor fraction (0.1 % to 67.8%) was present in the humic-associated As. In acid-soluble fractions, the transphillic- and hydrophilic-associated As were dominant in addition to As binding with humic and fulvic SOM. Arsenic binding was the strongest between pH 6 to 8 and reduced to about 70% at both low and high pH regions. The amount of both transphillic and hydrophillic associated As was less changed than humic and fulvic-associated As, in both low and high pH regions. This apparently indicates that As has stronger affinity towards hydrophillic rather than hydrophobic organics. From the experimental observation of As-binding SOM in natural soil, the ligand exchange model may be a feasible explanation of transphillic and hydrophillic affinity of As.

• 한국토양비료학회지
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• 제48권2호
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• pp.146-152
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• 2015

Heavy metal pollution has been a critical problem in agricultural field near at the abandoned metal mines and chemical amendments are applied for remediation purpose. However, biological activity can be changed depending on chemical amendments affecting crop productivity. Main purpose of this research was to evaluate biological parameters after applying chemical amendments in heavy metal polluted agricultural field. Result showed that soil respiration (SR) and microbial biomass carbon (MBC) were changed after chemical amendments were applied. Among three different amendments, lime stone (LS), steel slag (SS), and acid mine drainage sludge(AMDS), AMDS had an effect to increase SR in paddy soil. Comparing to control ($93.98-170.33mg\;kg^{-1}day^{-1}$), average of 30% increased SR was observed. In terms of MBC, SS had an increased effect in paddy soil. However, no significant difference of SR and MBC was observed in upland soil after chemical amendment application. Overall, SR can be used as an indicator of heavy metal remediation in paddy soil.

• 산업기술연구
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• 제29권A호
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• pp.55-60
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• 2009

Stabilization treatment is one of processes for wastes and their components to reduce their toxicity and migration rates to surroundings. Inorganic binders such as calcium hydroxide, blast furnace slag and red mud were tested for their potential applicability to in-situ stabilization of heavy metal contaminated tailings in the abandoned metal mines. Columns(150mm dia. ${\times}$ 450mm length) filled with mixtures of inorganic binders and tailing from the Geumjang mine with various mixing ratios of binders to tailings, 5%, 7% and 9% were applied artificial rainfall tests for 28 days. Effluents from columns filled with calcium hydroxide and tailing showed high pH's of ~12.5 and a increasing trend of concentration in Pb and Zn with a significant decrease in permeability in terms of elapsed days. Those with burning slag and tailing showed pH's of ~8.5 and significantly low concentrations in heavy metals with a stable permeability. In case of red mud, effluents showed significantly low concentrations in heavy metals but a decreased permeability with pH's of ~10.5. Conclusively, this basic study suggests burning furnace slag be a potential stabilizer for effective treatment of heavy metal contaminated mine tailings.

• 한국환경보건학회지
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• 제45권6호
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• pp.561-568
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• 2019

Objectives: The most commonly detected heavy metals in rocks and soils, including Pb, Cd, Cu, Fe, Mn and As, are representative pollutants discharged from abandoned mines and have been listed as potential sources of contamination in drinking water. This study focused on increasing the removal efficiency of heavy metals from drinking water resources by surface modification of natural adsorbents to reduce potential health risks. Methods: Iron oxide coating and graft polymerization with zeolites and talc was conducted for bipolar surface modification to increase the combining capacity of heavy metals for their removal from water. The removal efficiency of heavy metals was measured before and after the surface modification. Results: The removal efficiency of Pb, Cu, and Cd by surface modified zeolite showed 100, 92, and 61.5%, respectively, increases compared to 64, 64, and 38% for non-modified zeolite. This implies that bipolar surface modified natural adsorbents have a good potential use in heavy metal removal. The more interesting finding is the removal increase for As, which has both cation and anion characteristics showing 27% removal efficiency where as non-modified zeolite showed only 2% removal. Conclusions: Zeolite is one of the most widely used adsorptive materials in water treatment processes and bipolar surface modification of zeolite increases its applicability in the removal of heavy metals, especially As.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.1440-1445
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• 2008

There are 21 abondoned coal mines drained out mine water in gyeong sang do. We monitored the water quality of 31 mine drainage from 1995. The most of mine drainage was neutral as the average pH was 6.22 and Fe, Mn, Al concentration was below 10mg/L. The result showed the tendency of decreasing of flow and metal concentration. The highest Mn concentration was detected in bonghwa area and the hightest Fe concentration was detected in munkyung area. It means that the water quality is closly related to geological features.

• 산업기술연구
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• 제30권A호
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• pp.37-43
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• 2010

Polymeric materials in addition to Portland cement and hydrated limes were used to solidify heavy metal contaminated tailings from five abandoned metal mines in Korea. Mine tailings were mixed separately with Portland cement and hydrated lime at a concentration of 20-30 wt% and 6-9 wt%, respectively and Ethylene Vinyl Acetate(EVA) powder was added to each specimen at a ratio of 2.5 and 5.0 wt% to binders. Polymer-added and polymer-free solidified forms were evaluated for their appropriateness in accordance with the suggested test methods. Regardless of addition of polymeric materials, all solidified forms satisfy the uniaxial compressive strength(UCS) requirements(0.35MPa) for land reclamation and show remarkably reduced leaching concentrations of heavy metals such as As, Cd, Cu, Pb and Zn less than the toxicity criteria of Korean standard leaching test(KSLT). The addition of polymeric materials increased the UCS of solidified forms to improve a long-term stability of solidified mine tailings.

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

• 한국환경보건학회지
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• 제49권5호
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• pp.237-246
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• 2023

Background: Arsenic is a metalloid of public health significance due to its unique material properties and toxicity and the widespread pollution in the environment. Arsenic exists as inorganic arsenic and organic arsenic with distinct chemical properties. Its toxicity varies depending on the properties. Objectives: Although the carcinogenicity of arsenic has been identified, the various diseases that occur after acute and chronic exposure to arsenic are not yet clearly known. Methods: Research on the effects of chronic exposure to arsenic on human health was searched and the results were summarized. Results: It has been found that cancer occurs due to exposure to high concentrations of arsenic in areas with elevated exposure to arsenic, but research results have recently been presented on health effects caused by chronic exposure to low concentrations of arsenic. Cancers have also been identified to be related to inorganic arsenic, including skin cancer, lung cancer, and bladder cancer. Significant relationships with neurological diseases, cardiovascular diseases, and diabetes mellitus have been suggested as well. Conclusions: Our results suggest that it is necessary to evaluate the health impact on residents around abandoned metal mines and industrial complexes in South Korea.

• 한국환경농학회지
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• 제30권1호
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• pp.43-51
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• 2011

국내 15 지점의 폐광산 주변 지역에서 재배 생산된 백미 중 총 비소 오염도를 조사하였고, 연령과 성별에 따른 평균일 일노출량(ADD)을 산정하여 발암위해확률 및 비발암독성영향을 평가하였다. 광산 인근에서 재배 생산된 백미 중 총 비소의 평균 농도는 0.09 mg/kg으로 조사되었다. ADD값은 총 비소 함량에 무기 비소의 비율을 고려하여 산정하였으며, FAO/WHO에서 정한 2.1 ${\mu}g/kg$ b.w.-day의 PTDI 값을 초과하지 않았다. 그러나 광산 지역 인근에서 재배한 백미를 섭취했을 경우, 연령 및 성별 인구집단의 발암위해확률은 허용수준인 $10^{-6}{\sim}10^{-4}$ 범위를 초과하였고, 특히 6세 이하 유아의 경우 평균 10,000 명당 5인 이상의 높은 발암위해확률이 있는 것으로 산정되었다. 비발암독성위험값 (HQ)은 모든 연령 및 성별 인구집단에서 1.0을 초과하지 않았으며, 따라서 폐광산 주변 지역에서 재배 생산된 백미를 장기간 섭취하더라도 비소에 의한 인체 독성이 나타날 가능성은 없는 것으로 판단된다.

• 대한환경공학회지
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• 제32권1호
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• pp.47-52
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• 2010

국내 10개의 폐금속 광산을 대상으로 토양의 물리적, 화학적 및 생물학적 특성과 자생하고 있는 쑥(Artemisia princeps var. orientalis)의 카드뮴(Cd) 함량을 분석하였다. 식생이 없는 대조군 토양과 쑥 근권 토양의 Cd 함량은 산술평균으로 각각 5.92와 5.91 mg/kg으로 나타났으며, 분산분석 결과 두 토양간의 Cd 함량에는 유의한 차이가 없었다(p < 0.05). 그리고 쑥의 지상부와 지하부의 Cd 함량은 근권 토양의 Cd 함량과 유의한 상관관계를 보였다(p < 0.05, ${R^2}_{shoot}$ = 0.3120, ${R^2}_{root}$ = 0.4177). 쑥의 Cd 흡수 해석을 위하여 주성분 분석(PCA)을 실시한 결과, 최소 토양질 인자(MDS)로 유기물 함량 (OM), 탈수소효소 활성도(DHA), pH, 치환성 Mg가 선정되었다. MDS를 이용한 다중회귀분석 결과, 쑥의 지상부와 지하부의 Cd 함량의 회귀식에 대한 결정계수($R^2$)는 각각 0.3418과 0.5121로 나타났다. 이것은 MDS를 이용한 통계적인 토양질 평가가 식물의 중금속 흡수를 해석하는 유용한 기법이라는 것을 나타낸다.