• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.249-250
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• 2003

최근 동아시아의 발원지에서부터 편서풍을 따라 이동해 오는 황사는 중국의 북동부 공업지대에서 방출되는 중금속 오염물질까지 함께 섞여 수송되므로 그 피해는 훨씬 심각하다. 지난 20년 동안 황사에 대한 많은 연구가 발원지의 기원, 수송 및 침적 메카니즘, 그리고 황사의 광학적 특성과 물리적 특성의 정성분석을 중심으로 이루어져 왔다. 이들 연구는 주로 위성, 라이다. 원격탐사 그리고 기타 지표관측 자료를 이용하여 황사의 광학적 두께 및 화학성분 분석, 일기도를 이용한 기상장 분석, 그리고 중규모 기상 모델과 황사의 장거리 수송에 집중되어 있었다(정관영과 박순웅, 1997; Murayama et al., 2001). (중략)

• Analytical Science and Technology
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• v.23 no.6
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• pp.615-618
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• 2010

An oxygen bomb combustion procedure were studied for determination of heavy metal in polymer materials such as polyvinyl chloride and polypropylene by ICP-AES. This method is proposed as a rapid and simple sample preparation for decomposition of polymer containing certified contents of the analytes by teflon coated oxygen bomb combustion using different absorbing solution. The recoveries of metal were found to be 30~102% from absorbed solution by ICP-AES method using polypropylene certified reference material(PP CRM-As, Ba, Cd, Hg, Pb, Zn). The recoveries of metal using PVC CRM(Cd, Hg, Pb) was found to be 45 ~101% with same procedures.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2004.11a
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• pp.133-135
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• 2004

1. 침출수 수질 조사결고, pH는 $3.7\~5.0,\;COD_{Mn}$은 $760\~1,800mg/\ell,\;NO_3-N\;26.124\~78.150mg/\ell,\;NH_3-N$는 $144.5\~350mg/\ell,\;Cl^-$는 $13272.0\~34137.0mg/\ell$,는 $450\~1620mg/\ell$, SS는 $81.2\~652.7mg/\ell$, T-N은 $228\~430mg/\ell$, T-P는 $0.921\~1.108mg/\ell$로 분석되었으며, 중금속류는 거의 검출되지 않았다. 2. 지하수 수질조사결과, 수질상태는 지하수를 생활용수, 농업용수, 어업용수 및 공업용수로 이용하는 수질기준을 모두 만족시키고 있으며, 또한 분석을 실시한 항목에 대한 전조사지점이 대장균군을 제외한 수질조사 항목의 먹는 샘물기준을 만족시키고 있는 것을 확인할 수 있다. 3. 토양오염도 조사결과, 농경지 및 산업지역의 토양오염 우려기준을 크게 밑도는 것으로 분석되어 대상 매립지에서 발생하는 침출수 및 소각재 등의 주변지역 토양오염에 미치는 영향은 미약한 것으로 추정된다.

• Analytical Science and Technology
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• v.17 no.4
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• pp.363-367
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• 2004

A simple and convenient digestion method was developed for the determination of heavy metal in polyurethane sample using only nitric acid in open system without heating. This digestion method had prevented loss of volatile elements of Hg and As and reduced the pretreatment time for the sample digestion. The detection limit is lowered over 10 times than that of microwave digestion method. Recoveries in polyurethane material were 108% for As, 96 ~ 99% for Hg, 102 ~ 103% for Cr, 98 ~ 102% for Pb, 86 ~ 90% for Cd, and 90 ~ 93% for Cu.

• Journal of Korean Society of Environmental Engineers
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• v.29 no.12
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• pp.1390-1399
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• 2007

Samples of 45 school dust were collected in Daegu in January 2007, were sieved below 100 ${\mu}m$, and 14 elements were analyzed using ICP after an acid extraction. Results obtained from the source assessment of trace elements using enrichment factor showed that dust from playground were influenced by natural sources, while dust from classroom were influenced by urban anthropogenic sources. The measured values were remarkably higher in components from natural sources than in components from urban anthropogenic sources. Dust from classroom are highly concentrated than those from playground. Concentrations of dust in urban area are similar to those of dust in rural area and there was no significant difference in concentrations between classroom with playground soil and classroom with play-ground grass. Compared with other cities in Korea, concentrations of heavy metals in Daegu city were higher in classroom and lower in playground than those of heavy metals in other cities. Dust from classroom contained lower concentrations of trace elements than those from street in Daegu. Results of pollution indices of heavy metals indicated that playground was not contaminated with heavy metals and classroom was considered to be highly contaminated. No appreciable differences in playground were found between urban and rural areas but in case of classroom pollution, heavy metal concentrations were a little bit higher in urban areas than in rural areas. The correlation analysis among trace elements indicated that components in playground were significantly correlated, while components in classroom were less correlated. Trace element components of classroom dust were not significantly affected by those of playground dust.

• Journal of Food Hygiene and Safety
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• v.33 no.6
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• pp.438-446
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• 2018

The purpose of this study was to investigate food safety awareness, knowledge, and behavior in college students, to provide basic data for the increase in food safety awareness. Data were collected from 252 college students in Gyeonggi region, using a self-administered questionnaire. In results of concern about food safety, subjects responded 3.48 of 5.00 and have knowledge about food safety education revealing significantly higher awareness and concern than subjects without knowledge about food safety education. Food safety awareness of distributed food was 2.55, considered unsafe. Among reasons in perceiving food as unsafe, 62.3% of subjects expressed distrust about safety relative food production. As for risk factors relative to food safety, subjects responded that the highest risk factor was food additives (2.35), followed by heavy metal (2.38) and endocrine disrupters (2.38). Correlation analysis resulting in risk factors for food had positive correlation with each other, heavy metal revealed highest correlation with pesticide residue (r = 0.674), than with endocrine disrupters (r = 0.672). Also, genetically modified food revealed high correlation with radiation irradiated food. Regression analysis demonstrated that concern about food safety significantly influenced pro-actively engaging in food safety education. Meanwhile, 63.5% of subjects correctly responded to food safety knowledge items. The item 'the heavy metals are contaminated the most, in the roots of vegetables' revealed the lowest correct answer rate (38.1%). In food safety behavior, the item 'always wash hands before handling food and meal's revealed 3.85, and subjects with awareness and concern about food safety education, responded in significantly higher numbers than subject without awareness and concern about food safety. The most neglected concern was relative to frozen food thawed at room temperature. Together, students recognize that distributed foods are unsafe, and students with awareness and concern about food safety education showed higher knowledge compared to without awareness and concern experience about food safety eduction. So, systematic education using accurate and objective data is required to reduce anxiety and raise the level of awareness and concern about food safety.

• Korean Journal of Food Science and Technology
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• v.31 no.5
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• pp.1188-1195
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• 1999

This study was conducted to determin basic mineral compositions, chemical components, description of particle size distribution and whiteness for 32 items of insoluble mineral substances, i.e., 3 items of diatomaceus earth, 1 item of kaolin, 10 items of bentonite, 13 items of acid clay, 3 items of talc and 2 items of perlite. The chemical components and XRD (X-Ray diffractometer) for insoluble mineral substances, were similar with those of the reported references except kaolin. However, whiteness was determined in 90% level for talc, diatomaceus earth and kaolin. The contents of heavy metals in insoluble mineral substances were determined as follows : Pb, $nd{\sim}23.10$ ppm ; Cd, $nd{\sim}0.67$ ppm ; Hg, $nd{\sim}0.58$ ppm ; As, $nd{\sim}1.42$ ppm ; Cu, $nd{\sim}39.35$ ppm. These data were significanty lower than the references.

• Journal of Food Hygiene and Safety
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• v.36 no.1
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• pp.51-59
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• 2021

In this study we analyzed the elution rates of 11 metals from 82 metallic kitchen utensils purchased in the market. The elution frequency of the 11 types of metals was iron > aluminum > chromium, nickel > zinc > copper > lead > arsenic > antimony > stannum > cadmium. For metallic kitchen utensils, the elution rate of heavy metals was 7.3-93.9%, and the average elution concentration was 0.001-13.473 mg/L. The average elution concentration of heavy metals was ranged between none-detected (N. D.) to 30.473 mg/L for non-coated kitchen utensils and 0.000-10.005 mg/L for coated kitchen utensils. The average elution concentration of metals from domestic kitchen utensils ranged from 0.001-25.145 mg/L, and from 0.000-33.518 mg/L for imported kitchen utensils. In particular, aluminum was found to be high in domestic kitchen utensils while iron was high in imported kitchen utensils. The average elution concentration of heavy metals was N.D.-2.670 mg/L for stainless steel, N.D.- 31.575 mg/L for aluminum, and N.D.-307.737 mg/L for iron. The amount of transition to food after cooking was investigated.

• Analytical Science and Technology
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• v.13 no.2
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• pp.215-221
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• 2000

Analysis of fly ashes from the MSW incinerators was carried out using XRF, ICP-MS and ICP-AES. It was found that the major elements of fly ash were Ca, K, Na, Si, Al, S, Cl and O by the XRF analysis. The XRD spectra showed that the fly ashes were mainly consisted with the chlorides, hydroxides, carbonates and also oxides of former elements. For the determination of minor elements such as Zn, Pb, Cu, Cr, and Cd, we used ICP-AES and ICP-MS after microwave digestion and the results were compared with the result of XRF.

• Journal of Sericultural and Entomological Science
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• v.48 no.1
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• pp.11-15
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• 2006

Antheraea yamamai silk fibroin powder was prepared by treatment with HCl. The prepared A. yamamai fibroin hydrolysate was characterized by gel filtration chromatography, amino acid analysis, X-ray diffractometry, circular dichroism analysis, differential thermal analysis, and thermogravimetry. The average molecular weight of A. yamamai powder was about 430 and the major amino acids composed of the powder were Ala and Ser. According to XRD analysis, A. yamamai silk powder showed sharp diffraction peaks at $2{\theta}=20.34^{\circ}\;and\;31.5^{\circ}$. CD spectrum showed a peak around 220 nm and a should 215 nm, assigned to ${\alpha}-helix\;and\;{\beta}-sheet$ structure, respectively. DSC and TGA showed that the maximum degradation temperature of powder was around $250{\sim}270^{\circ}C$. Moreover, no harmful heavy metal was contained in the A. yamamai silk fibroin hydrolysate.