• 대한환경공학회지
• /
• 제28권3호
• /
• pp.329-336
• /
• 2006

제철부산물은 슬래그, 슬러지 및 분진 등의 다양한 부산물을 함유하며 이중 제강분진은 중금속 함량이 높아 지정폐기물로 버려지고 있다. 그러나 제강분진의 경우 Fe(0), Fe(II) 함량이 60% 이상으로 이의 활용에 대한 많은 연구가 있어왔다. 이중 최근에 제안되는 것이 제강분진을 이용한 독성 물질 함유 침출수의 처리이다. 이는 투수성 반응벽을 매립장 바닥차수재에 적용한 개념으로 침출수와 제강분진을 반응시켜 침출수의 TCE, PCE, 다이옥신 및 $Cr^{6+}$ 등의 독성물질을 환원, 무독화 시키고자 하는 것이다. 이를 위해 제강분진의 원소용출 특성규명이 선결되어야 하며 특히 제강분진의 장기적이고 다양한 환경에서의 용출특성을 알아보고자 다양한 용출방법을 택하였다. 즉, 가용용출시험, pH 고정 시험 및 연속주상시험 등을 이용하여 제강분진의 중금속 용출특성을 밝히고자 하였다. 중금속 항목 중 Cr과 Zn가 특정 pH 환경에서 우려수준 이상으로 용출되었으나 다른 원소들의 경우 위해성을 나타내는 농도 이하로 용출된다. 이중 Zn의 경우 제강분진 침출수의 pH가 12내외인 점을 고려할 경우 용출 가능성은 매우 낮을 것으로 판단된다. 그러나 Cr의 경우 반대로 알칼리 환경에서 더 용출된다. 따라서 제강분진 재활용에 앞서 Cr 용출을 제어할 수 있는 방법이 선행되어야 할 것이다. 주상시험에서 Cr 농도는 시간이 경과하면서 빠르게 감소하는 것이 관찰되었으며 이는 입자표면에 주로 분포한 Cr이 용출되거나 환원철과 반응하여 $Cr(OH)_3$ 등으로 공침, 제거되는 두 가지 가능성을 시사한다. Cr과 다른 중금속들의 용출제어 방법의 선행이 가능하다는 전제에서 중금속 농도가 매우 높은 폐수나 침출수에 제강분진을 제한적으로 적용이 가능하다고 판단된다.

• Nuclear Engineering and Technology
• /
• 제39권5호
• /
• pp.603-616
• /
• 2007

Roy Huddle, having invented the coated particle in Harwell 1957, stated in the early 1970s that we know now everything about particles and coatings and should be going over to deal with other problems. This was on the occasion of the Dragon fuel performance information meeting London 1973: How wrong a genius be! It took until 1978 that really good particles were made in Germany, then during the Japanese HTTR production in the 1990s and finally the Chinese 2000-2001 campaign for HTR-10. Here, we present a review of history and present status. Today, good fuel is measured by different standards from the seventies: where $9*10^{-4}$ initial free heavy metal fraction was typical for early AVR carbide fuel and $3*10^{-4}$ initial free heavy metal fraction was acceptable for oxide fuel in THTR, we insist on values more than an order of magnitude below this value today. Half a percent of particle failure at the end-of-irradiation, another ancient standard, is not even acceptable today, even for the most severe accidents. While legislation and licensing has not changed, one of the reasons we insist on these improvements is the preference for passive systems rather than active controls of earlier times. After renewed HTGR interest, we are reporting about the start of new or reactivated coated particle work in several parts of the world, considering the aspects of designs/ traditional and new materials, manufacturing technologies/ quality control quality assurance, irradiation and accident performance, modeling and performance predictions, and fuel cycle aspects and spent fuel treatment. In very general terms, the coated particle should be strong, reliable, retentive, and affordable. These properties have to be quantified and will be eventually optimized for a specific application system. Results obtained so far indicate that the same particle can be used for steam cycle applications with $700-750^{\circ}C$ helium coolant gas exit, for gas turbine applications at $850-900^{\circ}C$ and for process heat/hydrogen generation applications with $950^{\circ}C$ outlet temperatures. There is a clear set of standards for modem high quality fuel in terms of low levels of heavy metal contamination, manufacture-induced particle defects during fuel body and fuel element making, irradiation/accident induced particle failures and limits on fission product release from intact particles. While gas-cooled reactor design is still open-ended with blocks for the prismatic and spherical fuel elements for the pebble-bed design, there is near worldwide agreement on high quality fuel: a $500{\mu}m$ diameter $UO_2$ kernel of 10% enrichment is surrounded by a $100{\mu}m$ thick sacrificial buffer layer to be followed by a dense inner pyrocarbon layer, a high quality silicon carbide layer of $35{\mu}m$ thickness and theoretical density and another outer pyrocarbon layer. Good performance has been demonstrated both under operational and under accident conditions, i.e. to 10% FIMA and maximum $1600^{\circ}C$ afterwards. And it is the wide-ranging demonstration experience that makes this particle superior. Recommendations are made for further work: 1. Generation of data for presently manufactured materials, e.g. SiC strength and strength distribution, PyC creep and shrinkage and many more material data sets. 2. Renewed start of irradiation and accident testing of modem coated particle fuel. 3. Analysis of existing and newly created data with a view to demonstrate satisfactory performance at burnups beyond 10% FIMA and complete fission product retention even in accidents that go beyond $1600^{\circ}C$ for a short period of time. This work should proceed at both national and international level.

• 한국지구과학회지
• /
• 제26권6호
• /
• pp.573-583
• /
• 2005

부산지역에서 $PM_{10}$ 과 $PM_{2.5}$중의 금속 성분 농도를 파악하기 위하여 2004년 3월부터 2004년 12월까지 조사하였다. $PM_{10}$의 평균농도는 $58.2{\mu}g/m^3$ 농도범위는 $8.3\~161.1{\mu}g/m^3$이었으며, $PM_{2.5}$의 평균농도는 $29.3{\mu}g/m^3$, 농도범위는 $2.8~\65.3{\mu}g/m^3$였다. $PM_{10}$의 평균 질량농도는 황사시 $121.5{\mu}g/m^3$, 비황사시 $56.0{\mu}g/m^3$로 나타났다. 10 이상의 지각농축계수를 보인 성분은 Cd, Cr, Cu, Ni, Pb 및 Zn로서 인위적기원을 받은 것으로 추정된다. $PM_{10}$과 $PM_{2.5}$ 중 미량금속 성분의 지각농축계수는 황사시보다 비황사시에 높게 나타났으며, 인근의 공단지역으로부터 인위적 오염물질이 수송된 것으로 추정된다. $PM_{10}$과 $PM_{2.5}$의 토양입자의 평균 기여율은 각각 $15.2\%$와$17.5\%$였다. 토양기여율의 황사/비황사비는 $PM_{10}$과 $PM_{2.5}$에서 각각 1.9와 2.1로 나타났다.

• 한국환경생태학회지
• /
• 제22권3호
• /
• pp.241-248
• /
• 2008

본 연구는 대한민국 서해안 새만금 갯벌지역에서 $1999{\sim}2000$년에 도래한 섭금류 3종의 간에서 철(Fe), 아연(Zn), 구리(Cu), 납(Pb) 그리고 카드뮴(Cd) 농도를 측정하여 비교하고, 각 원소 사이의 상관관계를 분석하였다. 연구결과 철(ANOVA, p=0.018), 구리(ANOVA, p=0.043), 납(ANOVA, p<0.001) 그리고 카드뮴(ANOVA, p=0.016)은 종간에 유의한 차이가 나타났지만 아연에서는 유의한 차이가 나타나지 않았다. 본 연구에서 나타난 철, 아연 그리고 구리와 같은 필수원소는 조류의 체내 신진대사에 필요한 정상범위 내의 농도로 생각된다. 오염원소인 납 농도는 붉은어깨도요 Calidris tenuirostris $(5.76{\pm}2.14{\mu}g/dry\;g)$는 비오염수준이었지만 좀도요 Calidris ruficollis$(29.4{\pm}10.6{\mu}g/dry\;g)$와 뒷부리도요 Xenus sinereus$(15.9{\pm}11.9{\mu}g/dry\;g)$는 오염수준이었으며, 특히 좀도요는 중독수준에 근접하였다. 카드뮴 농도는 뒷부리도요$(0.82{\pm}12{\mu}g/dry\;g)$와 붉은어깨도요$(0.45{\pm}0.53{\mu}g/dry\; g)$는 비오염수준의 농도였으나, 좀도요$(17.5{\pm}22.1{\mu}g/dry\;g)$는 오염기준$(3{\mu}g/dry\;g)$을 초과하였다. 원소간의 상관관계에서는 납과 카드뮴에서만 유의한 관계가 나타났고 (r=0.067, p<0.01), 다른 원소는 상관관계가 나타나지 않았다.

• 한국지구과학회지
• /
• 제36권1호
• /
• pp.125-135
• /
• 2015

이 연구에서는 중등학교에서 사용할 수 있는 미세먼지 포집 장치를 직접 설계 및 제작하고 이를 통해 미세먼지에 포함된 중금속 및 미생물을 분석하는 활동이 가능한지 여부를 탐색하고자 한다. 중등학교 현장의 과학 탐구활동을 위해 청주지역에서 미세먼지를 포집하는 방법과 그 속에 포함된 중금속 및 미생물을 분석하였다. 미세먼지의 포집장소는 청주지역 대학교의 4층 건물 옥상에서 포집하였다. 모터 펌프, 인넷, 지름 $1.0{\mu}m$ 테프론필터, 필터 홀더 등을 이용하여 포집장치를 제작하였다. 이 포집장치를 이용한 미세먼지 포집은 2013년 12월-2014년 6월까지 진행하였다. 포집한 미세먼지의 중금속 성분과 미생물 포함 여부를 분석하였다. 중국에서 날아온 미세먼지 속에는 Cu, Zn, Cd, Ni, Pb 등인위적인 오염물질로 판단되는 중금속 성분이 국내 기원 미세먼지 보다 많았다. 더 나아가, 미세먼지 속에는 중금속 뿐만 아니라, 곰팡이나 세균같은 미생물도 다량 포함하고 있었다. 이 연구는 미세먼지가 중금속 뿐만아니라 미생물도 포함하고 있으므로, 이에 대한 체계적인 연구와 모니터링이 필요함을 시사한다고 할 수 있다. 또한, 이 연구는 중등학교 과학실험의 사례로 제공될 수 있다.

• 한국식품영양과학회지
• /
• 제26권6호
• /
• pp.1063-1067
• /
• 1997

This study was performed to assess the levels of the trace elements(Fe, Cu, Zn, Cr, Co, Mn, Pb, and Cd) in salt-fermented fish products from some areas of the west coast in Korea. Seven samples were Shrimp(Seawoo-jeot), Clam(Jogai-jeot), Oyster(Orikul-jeot), big eyed horring(Bendeng-ie jeot), Mysis(Gonjeng-ie jeot), Hwangandali(Hwangsegi-jeot), and Squid, Han Chi(Han chi-jeot). They were ashed with ternary solution. After ashing the samples, the amount of trace elements in the samples were measured by ICP. The moisture content of the 7 samples before freezing dry were 68.36, 71.52, 81.19, 62.27, 71.30, 64.27, and 66.74%, respectively. Jogai-jeot and Gonjeng-ie jeot contained the most amount of moisture among the samples. Fe contents were 66.46, 309.10, 27.03, 23.01, 132.45, 35.75, and 9.72ppm, respectively. Jogai-jeot contained the most amount of Fe among the samples. Cu contents were 4.60, 4.36, 3.75, 2.21, 10.36, 2.71, and 58.15ppm, respectively. Hanchi-jeot contained the most amount of Cu among the samples. Zn contents were 16.02, 75.06, 37.43, 28.43, 132.45, 35.75, and 9.72ppm, respectively. Gonjeng-ie jeot contained the most amount of Zn among the samples. Cr contents were 0.80, 1.61, 0.84, 0.96, 1.12, 0.96, and 0.59ppm, respectively. Jogai-jeot contained the most amount of Cr among the samples. Co contents were 0.13, 0.54, 0.31, 0.46, 0.50, 0.63, and 0.35ppm, respectively. Hwangsegi-jeot contained the most amount of Co among the samples. Mn contents were 7.30, 10.69, 14.87, 4.12, 8.03, 2.94 and 1.54ppm, respectively. Origkul-jeot contained the most amount of Mn among the samples. Pb contents were 1.80, 4.30, 2.53, 4.61, 3.08, 5.04, and 2.74ppm, respectively. Hwangsegi-jeot contained the most amount of Pb among the samples. Cd contents were 0.005, 0.03, 0.06, 0.005, 0.01, 0.00, and 0.10ppm, respectively. Hanchi-jeot contained the most amount of Cd among the samples. This study is limited within 7 samples caught and producted from the some areas of the west coast in Korea. Therefore, I hope there will be broader experiments concerned with this study to make clear not only nutritional aspect(the contents of Fe, Cu, Zn, Cr, Co, and Mn) but also toxicological aspect(the contents of Pb and Cd).

• 대한환경공학회지
• /
• 제33권10호
• /
• pp.756-766
• /
• 2011

공동주택 주차장의 먼지오염실태를 연구하기 위하여 2010년 3월말에서 6월초까지 대구지역 공동주택 36곳의 지상주차장(36지점)과 지하주차장(36지점)을 대상으로 채취한 총 72개의 시료를 $100{\mu}m$ 이하로 체거름하고 산추출한 후 ICP로 14개 원소를 분석하였다. 농축계수를 이용한 미량원소성분의 발생원 평가결과는 지상주차장과 지하주차장 모두 Fe, K, Mg, Mn, Na, V의 성분은 자연적인 발생원에 의한 영향을 받고 있는 반면에 Cd, Cr, Cu, Ni, Pb, Zn의 성분은 인위적인 발생원에 의한 영향을 받고 있는 것으로 나타났다. 한편 Ca은 지상주차장의 경우에는 자연적인 발생원의 영향을 받았고, 지하주차장의 경우에는 인위적인 발생원의 영향을 받은 것으로 나타났다. 미량원소성분의 농도분석 결과는 자연적인 발생원과 관련된 성분이 인위적인 발생원과 관련된 성분보다 매우 높은 농도를 보였다. 인위적인 발생원성분의 기여도는 지하주차장이 지상주차장보다 높았으며, 미량원소성분의 평균농도 또한 지하주차장이 지상주차장보다 높았다. 오염지수를 이용한 중금속성분의 오염도를 평가한 결과는 지하주차장이 지상주차장보다 5.5배정도 높게 오염된 것으로 나타났다. 미량원소성분간의 상관성 분석결과는 지상주차장이 지하주차장에 비해 유의한 상관성을 나타내는 항목이 많았으며, 특히 자연적 발생원 성분간 유의한 상관성이 더욱 크게 나타났다. 또한 유해 중금속성분과 지하주차장의 영향인자간의 상관성을 분석한 결과는 주차대수(공간)가 적은 지점이 큰 지점보다, 환기장치를 가동하지 않은 지점이 가동한 지점보다, 그리고 최근 도색년도와 청소일이 오래된 지점이 상대적으로 유해 중금속을 많이 함유하고 있었다.

• 천문학회지
• /
• 제12권1호
• /
• pp.41-70
• /
• 1979

From $B\ddot{o}hm$-Vitense's atmospheric model calculations, the relations, [$T_e$, (B-V)] and [B.C, (B-V)] with respect to heavy element abundance were obtained. Using these relations and evolutionary model calculations of Rood, and Sweigart and Gross, analytic expressions for some physical parameters relating to the C-M diagrams of globular clusters were derived, and they were applied to 21 globular clusters with observed transition periods of RR Lyrae variables. More than 20 different parameters were examined for each globular cluster. The derived ranges of some basic parameters are as follows; $Y=0.21{\sim}0.33,\;Z=1.5{\times}10^{-4}{\sim}4.5{\times}10^{-3},\;age,\;t=9.5{\sim}19{\times}10^9$ years, mass for red giants, $m_{RG}=0.74m_{\odot}{\sim}0.91m_{\odot}$, mass for RR Lyrae stars, $m_{RR}=0.59m_{\odot}{\sim}0.75m_{\odot}$, the visual magnitude difference between the turnoff point and the horizontal branch (HB), ${\Delta}V_{to}=3.1{\sim}3.4(<{\Delta}V_{to}>=3.32)$, the color of the blue edge of RR Lyrae gap, $(B-V)_{BE}=0.17{\sim}0.21=(<(B-V)_{BE}>=0.18),\;[\frac{m}{L}]_{RR}=-1.7{\sim}-1.9$, mass difference of $m_{RR}$ relative to $m_{RG},(m_{RG}-m_{RR})/m_{RG}=0.0{\sim}0.39$. It was found that the ranges of derived parameters agree reasonably well with the observed ones and those estimated by others. Some important results obtained herein can be summarized as follows; (i) There are considerable variations in the initial helium abundance and in age of globular clusters. (ii) The radial gradient of heavy element abundance does exist for globular clusters as shown by Janes for field stars and open clusters. (iii) The helium abundance seems to have been increased with age by massive star evolution after a considerable amount (Y>0.2) of helium had been attained by the Big-Bang nucleosynthesis, but there is not seen a radial gradient of helium abundance. (iv) A considerable amount of heavy elements ($Z{\sim}10{-3}$) might have been formed in the inner halo ($r_{GC}$<10 kpc) from the earliest galactic co1lapse, and then the heavy element abundance has been slowly enriched towards the galactic center and disk, establishing the radial gradient of heavy element abundance. (v) The final galactic disk formation might have taken much longer by about a half of the galactic age than the halo formation, supporting a slow, inhomogeneous co1lapse model of Larson. (vi) Of the three principal parameters controlling the morphology of C-M diagrams, it was found that the first parameter is heavy clement abundance, the second age and the third helium abundance. (vii) The globular clusters can be divided into three different groups, AI, BI and CII according to Z, Y an d age as well as Dickens' HB types. BI group clusters of HB types 4 and 5 like M 3 and NGC 7006 are the oldest and have the lowest helium abundance of the three groups. And also they appear in the inner halo. On the other hand, the youngest AI clusters have the highest Z and Y, and appear in the innermost halo region and in the disk. (viii) From the result of the clean separations of the clusters into three groups, a three dimensional classification with three parameters, Z, Y and age is prsented. (ix) The anomalous C-M diagrams can be expalined in terms of the three principal parameters. That is, the anomaly of NGC 362 and NGC 7006 is accounted for by the smaller age of the order of $1{\sim}2{\times}10^9$ years rather than by the helium abundance difference, compared with M 3. (x) The difference in two Oosterhoff types I and II can be explained in terms of the mean mass difference of RR Lyrae variables rather than in terms of the helium abundance difference as suggested by Stobie. The mean mass of the variables in Oosterhoff type I clusters is smaller by $0.074m_{\odot}$ which is exactly consistent with Rood's estimate. Since it was found that the mean mass of RR Lyrae stars increases with decreasing Z, the two Oosterhoff types can be explained substantially by the metal abundance difference; the type II has Z<$3.4{\times}10^{-4}$, and the type I has higher Z than the type II.

• 한국환경과학회지
• /
• 제23권2호
• /
• pp.275-289
• /
• 2014

Asian dust (or yellow sand) occurring mainly in spring in East Asia is affected by the distribution of weather systems. This study was performed to investigate the characteristics of suspended particulate for Asian dust at Busan, Korea in 20 March 2010, which was one of the extreme case for the last 10 years. There was used the data of weather chart, satellite, automatic weather system (AWS), $PM_{10}$, laser particle counter (LPC), and backward trajectories model. In synoptically, the high pressure was located in the northwestern part and low pressure was located in the northeastern part of Korea. The strong westerly winds from surface to upper layer makes it possible to move air masses rapidly. Air masses passing through Gobi Desert in Mongolia and Inner Mongolia plateau covered the entire Korean peninsula. As the results of aerosol analysis, $PM_{10}$ concentration at Gudeok mountain in Busan was recorded $2,344{\mu}g/m^3$ in 2300 LST 20 March 2010 and their concentration was markedly increased at coarse mode particle. In surface condition, westerly wind about 3 ~ 5 m/s was dominant and small particles of $0.3{\sim}0.5{\mu}m$ were distributed on the whole. In heavy metal components analysis, the elements from the land was predominated.

• 환경위생공학
• /
• 제7권1호
• /
• pp.57-66
• /
• 1992

To investigate on the element content of twelve edible mushrooms and Aloe arborescent, i.e., Lentinus edodes, Ganoderma lucidum (culturing in wood and soil), Tricholoma matsutake, Agaricus auricula-Jude (produced in Korea and China), sarcodon asparatus, Pleurotus ostreatus, Coriolus bisporus, Cyrophora esculenta, Auricularia auricula-Jude (produced in Korea and China), Sarcodon asparatus, Pleurotus ostreatus, Coriolus rersicolor, Smilax rotundifolia and Aloe arborescenstyl were analyzed by Atomic absorption spectrometer. The obtained results were summarized as follows : 1. Potassium, sodium, magnesium and iron content for the most part samples were in large quantities, especi phosphorus content of those was highest ammount for the all samples. 2. Sodium content f·as much ammount in the Lentinus edodes(39 mg, and Ganoderma lucidum(20 mg) , Culturing in wood and soil, while potassium was very high ammount in the Aloe arborescens and other samples. Mush ammount of magnesium as compared with others was Lentinus edodes(144 mg) , Ganoderma lucidum(128 mg), Aloe arborescens(50 mg) and Pleurotus ostreatus (60 mg) . 3, Phosphorus content of Lentinus edodes, Gyrophora esculenta, Auricularia polytricha and Agaricus bisporus was much ammount while iron content of all samples equality higher ammount. Sodium content of Aloe arborescens was not analyzed out for almost all, its potassium(82 mg), magnesium(50 mg) and iron(18 mg) content comparatively higher quentity than others nllnerals and phosphorus volume (4.9 mg) as compared with others, was conspicuously lower detect. 4. Cadimium and lead content of harmful metal element were detected on trace quantity for the most part samples. 5. Organic acids of samples i.e., Lentinus edodes, Agaricus bisporus, Pleuritus ostreatus and Ganoderma lucidum were Citrate, Malate, Fumalate, Succinate, Oxalate, Acetate, Lactate, and Tartarate and Citrate, Malate and Fumarate contents were higher amount remarkbly than other organic acids. Tartarate content was trace amount.