• Journal of Environmental Health Sciences
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• v.30 no.1
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• pp.41-49
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• 2004

Attention Deficit Hyperactivity Disorder (ADHD) is one of the most general childhood problems occurs locally and internationally, but the causes of ADHD are not cleared yet. Therefore, this study tried to examine some parts of the causes of ADHD closely, and finally contribute to the medical treatment of ADHD and its precautionary measures, by measuring and comparing concentration of minerals in hairs of the patients of ADHD and their control group's children. which can analyze the relevance to ADHD and the mineral content in human bodies, and mutual relations between toxic minerals and essential minerals in human bodies. After collection of hairs from 200 children(5 to 7-year-old, boys: 159 girls:41) diagnosed as ADHD by medical specialists based on the standard of DSM-IV diagnosis and their control group's 177 children(boys: 138 girls:39), the mineral concentration of samples was measured through ICP-MS and compared. And correlations between toxic minerals and essential minerals in human bodies among patients group was analyzed. All the toxic minerals(Pb, Hg, Al, Cd, As) of hairs analyzed in the study showed more higher range of concentration in patients group in comparison with their control group. Among them, the concentration of Pb(3.27 $\pm$ 3.82 ppm) and As(0.16 $\pm$ 0.15 ppm) in patients group were significantly high compared to their control group. And in this study Pb among toxic minerals showed negative correlation with Zn(r = -0.43), Mg(r = -0.15) among essential minerals. Cd among toxic minerals showed negative correlation with Zn(r = -0.20) among essential minerals. As among toxic minerals showed negative correlation with Ca(r = -0.14) among essential minerals.

• Journal of Environmental Health Sciences
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• v.31 no.3
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• pp.187-191
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• 2005

Several heavy metals are known to give some kinds of mental retardation although abnormal X-chromosome is closely connected with genetic disease such as mental retardation. This study dealt with the influence of minerals in the hair of mental retardation people. Minerals were analyzed by Inductively Coupled Plasma Mass Spectrometer (Sciex Elan 6100, Perkin-Elmer corporation, Foster, CA, USA). The nutritional elements such as Ca, Na, K were higher level (p<0.01) in normal group than in the mental retardation group. The toxic elements such as Cd (p<0.01) and As were higher level in the mental retardation group than in normal group. But Pb is not significant difference among the all groups including normal group.

• Journal of Korean Medicine for Obesity Research
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• v.4 no.1
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• pp.67-80
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• 2004

Objectives: Obesity is a growing epidemic with subsequent health consequences leading not only to reduced quality of life but also to increased medical costs. Recently nutritional balances are emphasized in the field of obesity, and especially maintaining proper equilibriums of minerals. The correlation of minerals obtained from the method of HTMA(Hair Tissue Mineral Analysis) with obese degree has not been studied in Korea yet. We studied any significant difference of mineral concentrations and components according to the obese degree. Methods: 78 subjects were analyzed who visited Garosero clinic of oriental medicine to lose their weight from June to November 2004. We used BMI(Body Mass Index), PBF(Percent Body Fat), WHR(Waist-Hip Ratio) and abdominal circumference obtained by bio-electrical impedance analysis as an obese degree. And we analyzed correlation with mineral concentrations and ratios obtained from HTMA. Results & Conclusion: 1. Na, K, Zn, Se had significant correlation with obese degree in case of nutritional minerals from HTMA. Especially, K had high significance. 2. Toxic minerals from HTMA had no significance with obese degree. 3. Rb had significant correlation with obese degree in case of additional minerals from HTMA. 4. Among important ratios from HTMA, Na/K had significant correlation with obese degree, but Ca/K had correlation except PBF, and Na/Mg had correlation except WHR. 5. Among toxic ratios from HTMA, Se/Hg had significant correlation with obese degree, but S/Hg had correlation except BMI. 6. Na, K, Zn, Rb, Na/K, Ca/K had significant differences between obesity groups classfied by BMI. Ob II group had sinificant difference from NW group in cases of K, Zn, Rb, Na/K, and Ob II group had sinificant difference from OW group in case of Ca/K.

• Korean Journal of Environmental Agriculture
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• v.22 no.3
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• pp.177-184
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• 2003

Although clay can sorb significant amounts of inorganic contaminants from soils and wastewater, the hydration of exchangeable cations in clay minerals makes it hydrophilic at the clay mineral surfaces and interlayers. Thus, natural clays are often ineffective in complexing and stabilizing toxic organic contaminants in soils and groundwater environment. But, substituting these hydrated cations with cationic surfactant such as QAC(Quaternary ammonium Compound) can change the natural clay from hydrophilic to hydropobic. Furthermore functionalized organoclay can act as a powerful dual function sorbent for both toxic metals and organic compounds. It also can be used as landfill clay liners, slurry walls, nano-composite materials, petroleum tank farms, waste treatment, and filter systems. To use this modified clay minerals effectively, it is required to understand the fundamental chemistry of organoclay, synthetic procedures, its engineering application, bioavailability of sorbed ion-clay complex, and potential risk of organoclay. In this review, we investigate the use, application and historical background of the organoclay in remediation technology. The state-of-the-art of organoclay research is also discussed. Finally, we suggest some future implications of organoclay in environmental research.

• Proceedings of the Korean Ceranic Society Conference
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• 2000.04a
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• pp.114.2-114.2
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• 2000

• Proceedings of the Korean Geotechical Society Conference
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• 2008.10a
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• pp.1098-1108
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• 2008

Batch type and column type experiments were performed in order to predict adsorption and movement within soil. Clay minerals montmorillonite and kaolinite were respectively added to paraquat which is a cationic compound with long residual time, 2,4-D which is an anionic compound with relatively short residual time and napropamide which is an amphoteric compound. Therefore, it is very important to determine the movements of toxic pollutants in the ground soil to establish measures to prevent soil grounds contamination and to restore contaminated soils effectively, because contamination of soil is getting severe due to these toxic wastes, industrial waste water, and agricultural chemicals, etc. Therefore, in this study, we have carried out column and batch experiments by using general toxic organic compounds as test samples in order to restore contaminated soils effectively as well as to prepare a basic data to develop absorbents that will remove various toxic organic compounds, with a grandiose purpose to prevent contaminations of soil and grounds due to various toxic organic compounds.

• Economic and Environmental Geology
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• v.29 no.4
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• pp.495-508
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• 1996

This study had three purposes: (1) to investigate dispersion and enrichment level of potentially toxic elements; (2) to identify uranium-bearing minerals in black shales; and (3) to assess the chemical speciation of heavy metals in soils and sediments. Rock, surface soil and stream sediment samples were collected in the Chungjoo area covered with black shales in Korea. These samples were analyzed for multi-elements using INAA and ICP-AES. The maximum abundance of U in black shales is 56 ppm and radioactivity counts up to 240CPM. Molybdenum, V, Ba, Cu, and Pb are enriched in black shales and most of soils show high concentrations of U, Mo, Ba, Cu, Pb and Zn. Concentrations of potentially toxic elements decrease in the order of mountain soil > farmland soil > paddy soil. Enrichment index of soils and sediments are calculated and higher than 1.0 in the black shale area with the highest value of 6.1. In order to identify U-bearing minerals, electron probe micro analysis was applied, and uraninite and brannerite in black shale were found. Uraninite grains are closely associated with monazite or pyrite with the size of $2{\mu}m$ to $10{\mu}m$ in diameter whereas brannerite occurs as $50{\mu}m$ euhedral grains. With the results of sequential extraction scheme, residual fractions of Cu, Pb and Zn in soils are mainly derived from weathering of black shale but Cu, Pb and Zn in sediments are present as non-residual fractions. Lead is predominantly present as oxidizable phase in soils whereas Zn is in exchageable/water-acid soluble phase in sediments.

• Analytical Science and Technology
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• v.10 no.6
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• pp.459-467
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• 1997

Due to the growing demand for bottled mineral waters, a study was undertaken to determine the quality of the twenty six brands of domestic and imported drinking waters. The quality of water was evaluated by analyzing the twenty four elements including minerals, essential and/or toxic trace elements, and the analytical items to affect the taste of water. The contribution of drinking water to the mineral nutrition of human was calculated in order to investigate the health effect of drinking water. The taste of water was evaluated in terms of minerals, anions, TDS, alkalinity, hardness and pH.

• Applied Chemistry for Engineering
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• v.33 no.5
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• pp.502-522
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• 2022

Clay minerals are natural materials that show widespread applications in various branches of science, including environmental sciences, in particular the remediation of water contaminated with various water pollutants. Modified clays and minerals have attracted the attention of researchers in the recent past since the modified materials are seemingly more useful and efficient for removing emerging water contaminants. Therefore, modified engineered materials having multi-functionalities have received greater interest from researchers. The advanced clay-based materials are highly effective in the remediation of water contaminated with organic and inorganic contaminants, and these materials show enhanced selectivity towards the specific pollutants. The review inherently discusses various methods employed in the modification of clays and addresses the challenges in synthesizing the advanced engineered materials precursor to natural clay minerals. The changes in physical and chemical properties, as investigated by various characterization techniques before and after the modifications, are broadly explained. Further, the implications of these materials for the decontamination of waterbodies as contaminated with potential water pollutants are extensively discussed. Additionally, the insights involved in the removal of organic and inorganic pollutants are discussed in the review. Furthermore, the future perspectives and specific challenges in the scaling up of the treatment methods in technology development are included in this communication.

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.163.1-163.1
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• 2003

Arsenic is a ubiquitous element that ranks 20th in abundance in the earth's crust, 14th in the sea water, and is a component of several hundred minerals. Arsenic and its compounds are mobile in the environment. Groundwater contamination by arsenic is a serious threat to mankind all over the world and it can also enter food chain. Humans are exposed to this toxic arsenic from air, food and water. (omitted)