• Proceedings of the KSEEG Conference
• /
• 2003.04a
• /
• pp.238-240
• /
• 2003

본 연구는 덕음광산 광미시료에 대한 각 pH별 중금속 거동 및 본 지역에서 중금속과 밀접한 관계를 가지는 토양광물인 Mn-함유광물의 용해도의 상관성을 규명하고자 한다. 본 연구를 통하여 Mn-함유광물의 용해도에 따른 중금속의 거동간의 상관관계를 알아봄으로서 광산 주변 지역의 지구화학적인 변화를 예측하고 오염지역 특성을 정확하게 이해할수 있도록 정보를 제공하고자 하였다. (중략)

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 2003.04a
• /
• pp.385-388
• /
• 2003

폐광석에 함유되어 있는 총중금속함량을 측정하기 위한 전함량분석과 중금속을 다량 함유한 폐광석이 산성환경에 노출되어 있을 경우 중금속의 지화학적 거동을 파악하기 위해 산도를 변화시키면서 용출실험을 실시하였다. 전함량분석과 용출실험을 종합한 결과, 중금속 및 미량원소의 용출거동 특성을 크게 As-Co-Fe 형태와 Cu-Mn-Cd-Zn형태와 Pb로 구분할 수 있었다. As-Co-Fe의 용출특성은 약산성의 환경에서는 용출이 미약하나, 최종 pH 1.5이하의 강산성환경에서는 용출량이 급격하게 증가하며, Cu-Mn-Cd-Zn형태에서는 최초로 용해되는 pH가 5.0-3.0으로 As-Co-Fe 보다 다소 높았다. Pb는 다른 형태에 비해 상당히 적게 용출되었다 최종 용출된 함량과 관계없이 초기 용출이 발생하는 pH값을 기준으로 한 각 원소의 상대적인 이동성은 Mn =Zn>Cd=Cu>>Fe=Co>As>Pb 순서이며, 산성비는 Zn, Mn 및 Cu를 쉽게 용출시켜 이동도를 증가시킬 것으로 판단된다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 1998.11a
• /
• pp.195-200
• /
• 1998

토양내에 있어 중금속의 총량 분석만으로는 오염 토양에 대한 환경 평가를 위한 충분한 자료가 되지 못한다. 또한 중금속의 토양내 위해성은 중금속과 토양과의 화학적 상호작용에 의해 결정되기 때문에 중금속의 화학적 형태를 규명하는 것은 토양 환경에 있어서 그들의 이동성과 거동 특성을 평가하는데 중요한 자료가 된다. 연속 추출법은 구봉 광산의 광미로 부터 Cd, Cu, Pb을 화학적 형태에 따라 분리하고, 인위적으로 중금속을 포화시킨 광미와 두밭토양에 있어 중금속의 토양내 거동 특성을 예측하기 위하여 이용되었다. 광미중 Pb의 대부분은 Fe-Mn oxide, carbonate의 결합 형태로 존재하였으며, Cu와 Cd은 각각 71.8%와 42.9%가 유기물, carbonate의 결합형태로 존재하였다. 상당량의 Cd(94.9%), Cu(95.1%), 그리고 Pb(85.8%)은 토양내 잠재적으로 이동 가능한 형태로 존재하였다. 유성과 논산의 밭토양 에 가해진 Cd는 대부분 이동성이 가장 높은 치환태로 존재하였으며, 유성과 논산 토양에서 각각 67.9%와 93.2%가 치환태로 존재하였다. 토양에 가해진 Cd, Cu, Pb은 대부분 이동이 용이한 형태로 존재하였으며, 토양과의 결합세기는 Pb > Cu > Cd 순으로 감소하였다.

• Journal of Korea Soil Environment Society
• /
• v.4 no.2
• /
• pp.149-161
• /
• 1999

In this study, to examine the applicability of the lime sludge as a landfill liner, 1) the geoechnical characteristics of sludge, 2) the characteristics of migrations of contaminants, and 3) the characteristic of leaching in the batch leaching test are investigated As a result, the hydraulic conductivity(K) of the lime sludge was found out to have 10 times lower hydraulic conductivity than the maximum allowable hydraulic conductivity of the liner Retardations of heavy metals(Cu, Pb) were found out to be higher than that of organic(phenol) due to the high pH(>11.0) of 4he lime sludge. As a result of the leaching test. the concentrations of Pb and Cu were found to be close to allowable limitation, so that they need to be kept in constant watch.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 1998.04a
• /
• pp.202-203
• /
• 1998

• Proceedings of the KAIS Fall Conference
• /
• 2012.05a
• /
• pp.352-355
• /
• 2012

산성광산배수(Acid Mine Drainage)는 낮은 pH, 높은 Sulfate, 상대적으로 높은 Fe, Al, Mn 등의 중금속 농도가 특징으로 다양한 오염인자를 가지고 있으며, 각각의 오염인자가 오염에 미치는 영향이 매우 다양하게 나타난다. 특히 산성광산배수는 유역 내 시각적, 생태학적 문제를 일으켜 많은 환경오염을 야기하고 있으며, 많은 중금속을 용출시켜 주변 하천의 생태계를 파괴하게 된다. 이러한 산성광산 배수에 의한 환경피해의 심각성은 이미 국 내외에서 널리 인식되고 있으며, 이를 효과적으로 관리하기 위해서 산성광산배수의 거동 매커니즘 조사에 대한 연구가 필요하다. 따라서 본 연구에서는 금강수계 거풍광산 유역 장연천을 대상으로 하여 광산주변 표토, 계절별 거리별 하천수 및 저질토에서의 오염특성을 조사하고 그 영향을 평가하고자 하였다. 연구결과 하천수의 경우 대부분의 중금속 농도가 오염물질의 축적이 가장 많을 것으로 예상되는 5월에 높은 농도를 보였으며, 강우가 시작되는 6월, 7월까지 건기에 비해 높은 농도를 유지하다가, 강우가 지속됨에 따라 희석되어 농도가 감소되는 현상을 나타냈다. 저질토의 경우도 비슷한 양상을 타나냈다. 거리별 영향의 경우 하천수는 산성광산배수가 유입되는 상류에서 지속적으로 높은 농도를 나타냈으나, 저질토의 경우 건기에는 비슷한 양상을 나타내다가 우기에 강우의 영향으로 하천 하류에서 전체적으로 농도가 높아지는 경향을 나타냈다.

• Economic and Environmental Geology
• /
• v.37 no.3
• /
• pp.311-324
• /
• 2004

We investigated the contamination and behavior of heavy metals in stream sediments within the watershed of Juam Reservoir. Many abandoned mines within the reservoir can act as a potential contaminant source for water quality. Heavy metal concentrations (Cr, Cu, Ni, Pb and Zn) in stream sediments from watershed are very low, indicating that content of heavy metals in the sediments probably do not affect the water quality in Juam Reservoir. However Pb concentration in the stream sediments increases downward streams, suggesting the possible diffusion of Pb contamination. According to the leaching ratio for stream sediments at a strong acidic condition in the abandoned mine areas, the relative mobility for metals decreases in the order of Pb＞Zn=Cu＞Ni＞Cr, indicating that Pb can have a bad effect upon the water quality in Jum Reservoir. Moreover, if contaminated sediment is placed in the bottom of reservoir (i.e., reducing condition), the relative mobility of Pb is the highest, indicating that Pb in the bottom sediments can be leached to water at interface between water and sediment with changing in physicochemical conditions.

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

• The Journal of Engineering Geology
• /
• v.33 no.4
• /
• pp.701-716
• /
• 2023

Microplastics (<5 mm diameter) in aquatic environments adsorb heavy metals, potentially exposing humans to their toxic effects via food chains. We investigated factors influencing the adsorption of heavy metals on microplastics in aquatic environments, examining their adsorption processes and mechanisms. Adsorption characteristics vary with polymer type, crystallinity, particle size, and environmental conditions (pH, temperature, weathering), and the adsorption capacity for heavy metals increases with weathering and reduction in polymer particle size. However, correlations between environment temperature, polymer crystallinity, and adsorption capacity for heavy metals could not be confirmed. The adsorption behavior of heavy metals can be explained in terms of physicochemical adsorption processes and evaluated through adsorption kinetics and isothermal studies, with multiple mechanisms usually being involved. An understanding of the adsorption of heavy metals by microplastics should aid evaluation of the potential risks of microplastics in aquatic environments.

• Applied Chemistry for Engineering
• /
• v.10 no.5
• /
• pp.696-700
• /
• 1999

The effects and behaviors of heavy metals incoming from industrial by-products were investigated in cement clinker reaction. The raw meal containing 500 ppm of heavy metal ion such as Cu, Cd, Cr, and Pb was calcined at $1450^{\circ}C$ for 30 minutes. Burnability index, fixation concentration of heavy metals in clinker, and apportionment ratio were analyzed. Pb had a minimum fixation concentration of under 5% and Cr had a maximum over 85%. The burnability of Cr containing clinker was lower than that of others as the result of higher value of 3.41% of free lime after calcination at $1450^{\circ}C$. Cu, Cd, and Pb had not any significant effects on the clinker reactitivity. The volatility of heavy metals produced lots of macropores and micropores in clinker and minerals. Cd and Cr were the major apportionments in alite and belite and Cu in interstitial phase. Pb was existed under the detection limit of EDAX analysis due to its higher volatility.