• Environmental Engineering Research
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• 제25권3호
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• pp.409-417
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• 2020

Investigation was carried out to assess the effect of cement dust deposition on the physico-chemical properties of soil near some cement plants in Jaintia Hills, Meghalaya. Soil samples were collected and analysed and compared with the control site. Comparison of various soil physico-chemical parameters revealed that cement dust emanating from cement plants has changed the soil quality in the surrounding areas of cement plants. The normal soil pH in the area is generally acidic. However, due to the continuous deposition of cement dust soil pH was found slightly alkaline near the cement plants. The higher values of soil parameters such as electrical conductivity and bulk density were also noticed near the cement plants. However, lower values of water holding capacity, soil moisture content, soil organic carbon and total nitrogen content were found compared to the control sites. The effect of cement dust deposition on soil is more in areas nearer to the cement plants. At present the changes may not be so serious but if this trend continues, soil properties of a vast area around the cement plants are likely to change leading to multiple effects on flora, fauna and socio-economy of the area.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2001년도 추계학술발표회
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• pp.15-18
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• 2001

Sixty natural springs and wells used as community facilities for drinking water are developed along mountain climbing way of suburban area and residential area in Daejeon City. In this study, the seasonal variation of their water quality and hydrochemical characteristics were investigated. Some natural springs are vulnerable to bacilli contamination because of their short residence time and shallow circulation in subsurface environment. The waters show hydrochemical types of Ca-HCO$_3$ and Na-HCO$_3$, and are characterized by low electrical conductance and weak acidic pH.

• 약학회지
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• 제31권4호
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• pp.236-251
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• 1987

The chemistry, antimicrobial properties, organic soil resistance, toxicity, corrosivity and chemical stability of stabilized alkaline 2%, glutaraldehyde solution(SGS) are discussed. SGS retains the maximum antimicrobial activity of alkaline glutaraldehyde solutions and the chemical stability here to fore observed only with acidic glutaraldehyde solutions. These improvements, along with the inherent resistance of glutaradehyde to neutralization by organic soil, allow SGS to be continuously used for 14 days in situations of high dilution, or 28 days in situations of low dilution.

• 한국광물학회지
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• 제1권1호
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• pp.32-39
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• 1988

The effect of soil forming factors on the pedogenesis of basaltic volcanic ash soils and the influence of allophane material on soil properties have been investigated on 5 chronosequence soils situated from at the near sea coast up to the foot slope of Mt. Halla in Jeju Island. Time seems to be the important soil forming factor which today differentiates soil of the Island. Songag and Donghong soils developed in lower elevations are older and somewhat less influenced by ash shower. However, soils developed at higher elevations, Pyeongdae and Heugag, are rather younger and strongly influence by the ash. It is also proved that the parent materials are very heterogeneous. They mainly are basaltic with some contamination of acidic volcanic ashes and continental aeolian deposits where a considerable amount of quartz encountered in most soils studied. Many physico-chemical properties of soil, such NaF pH, phosphate sorption power, pH and extractable acidity are parameters to differentiate andepts and non-andeptic soils.

• 자원환경지질
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• 제54권3호
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• pp.331-352
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• 2021

The relationship of both heavy metals and major elements in soil, plants, and groundwater was studied in a hyper-arid area and depends completely on the groundwater to cover its all needs. The study reviles that 27.3% of the studied groundwater was strongly acidic and has very low pH values (

• 방사성폐기물학회지
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• 제22권2호
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• pp.159-171
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• 2024

This study aimed to develop an efficient recycling process for wastewater generated from soil-washing used to remediate uranium (U(VI))-contaminated soil. Under acidic conditions, U(VI) ions leached from the soil were precipitated and separated through neutralization using hydrazine (N₂H₄). N₂H₄, employed as a pH adjuster, was decomposed into nitrogen gas (N₂), water (H₂O), and hydrogen ions (H⁺) by hydrogen peroxide (H₂O₂). The residual N₂H₄ was precipitated when the pH was adjusted using sulfuric acid (H₂SO₄) to recycle the wastewater in the soil-washing process. This purified wastewater was reused in the soil-washing process for a total of ten cycles. The results confirmed that the soil-washing performance for U(VI)-contaminated soil was maintained when using recycled wastewater. All in all, this study proposes an efficient recycling process for wastewater generated during the remediation of U(VI)-contaminated soil.

• 한국환경농학회지
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• 제3권2호
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• pp.16-22
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• 1984

용액(溶液) 내(內)에서 dinobuton의 분해(分解)에 미치는 온도(溫度)와 pH의 영향(影響) 및 토양중(土壤中)에서의 분해양상(分解樣相)을 조사(調査)한 결과(結果)는 다음과 같다. 증류수(蒸溜水) 내(內)에서 dinobuton의 반감기(半減期)는 $30^{\circ}C$와 $60^{\circ}C$에서 각각(各各) 27일(日)과 6일(日)이었다. 산성(酸性)인 완충용액중(中)에서 dinobuton의 반감기(半減期)는 약(約) 27일(日)이었으나 pH가 9,10에서는 각각 10일(日), 4일(日)로 alkali성(性)이 강(强)할수록 dinobuton의 분해(分解)는 빨랐다. 증류수(蒸溜水)와 완충용액 내(內)에서는 dinobuton이 가수분해(加水分解) 되어서 소량(少量)의 dinoseb가 생성(生成)되었다. Dinobuton의 분해(分解)에 미치는 토양미생물(土壤微生物)의 영향(影響)을 조사(調査)한 결과(結果), 살균토양(殺菌土壤)에서는 무살균토양(無殺菌土壤)에서 보다 dinobuton의 반감기(半減期)가 약 16일(日) 지연(遲延)되었으며, dinobuton의 분해생성물(分解生成物)인 dinoseb도 살균토양(殺菌土壤)에서 분해(分解)가 지연(遲延)되었다.

• Journal of Ginseng Research
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• 제13권1호
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• pp.105-113
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• 1989

This study was conducted to determine the cause of the occurence of marginal leaf chlorosis in ginseng plants (Panax ginseng C.A. Meyer), and to determine its emersion in fields (practically) and in pots (experimentally). The following results were obtained. In the Present investigation, ginseng plants raised in acidic soil containing a high a moue t of Mn showed marginal leaf chlorosis. Henre it Ivas suggested that the shoot growth and root weights became grad gractually lower. The leaves having marginal leaf chlorosis contained low amounts of N, P,. Ca, Mg, and Na and the Fe/Mn ratios were low. There was a corresponding increase in Mn uptake. It was founrl that in soils where marginal leaf chlorisis occured the pH urar brlolv 4.2 to 4.9 and the Ca, Mg and Na content was decreased thus effectively increasing the available manganese in the soil. The Mn/Fe ratios in the yellow leaf margins of ginseng Plants affected by the Mn toxicity was over 2.0 compared to the general Mn/Fe ratio of 0.50 for healthily leaves, stems and roots. Typically when ginseng plants grow fields having soil with a pH below about 5.0, there tenor to be an uptake of excess Mn. When ginseng plants are grown in a nutrient sand culture solution It with an increased Mn concentration, they accumulate large amounts of Mn in the roots and in the shoots. In both casts marginal leaf chlorosis appeared in the emersions. In the Present investigation, ginseng plants raised in acidic soil and containing a high amount of Mn showed marginal leaf chlorosis.

• 한국물환경학회지
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• 제22권5호
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• pp.871-878
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• 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.

• 미생물학회지
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• 제25권3호
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• pp.238-243
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• 1987

본 실험에서는 숲속 토양으로부터 산성조건에서 생장이가능한 내산성 균주를 분리 동정하였다. 분리된 균주는 형태적 관찰과 박층 크로마토그래피에 의한 세포벽 분석과 ISP 분류 기준에 따른 생리적 실험을 통하여 동정하였으며, 이 균주의 포자는 형태가 간상형이고 표면구조는 매끈한 형태였다. 포자의 배열형태는 compact spiral 구조였으며 이 균주는 명확한 포자낭벽을 갖고 있지 않았고, 세포벽 분석결과에 따르면 Streptomyces 속에 속하는 것으로 밝혀졌다. 또한 중성조건에서 생장이 우수하나 산성조건에서도 생장이 가능한 내산성 균주로써, Nonomura의 분류 기준에 의하면 Streptomyces mirabilis인 것으로 동정되었다.