• The Korean Journal of Food And Nutrition
• /
• v.13 no.6
• /
• pp.595-601
• /
• 2000

The seven trace metals contents of agricultural products in Kwang-ju were investigated to provide the basic data for its residual limits. Ten kinds of agricultural products (onion, welsh onion, garlic, lettuce, cabbage, pepper, spinach, radish, pear, peach) collected within from Kwang-ju in 1999 were analyzed by Mercury Analyzer for mercury. Inductively Coupled Plasma spectrometer and Atomic Absorption spectrophotometer equipped with Vapor Generation Accessory for Cu, Cd, Mn, Pb, Zn and As. Hg contents were not detected in all samples and As content were detected N.D. ∼0.005 ppm. Cd and Pb contents were detected N.D ∼0.088 ppm and N.D.∼0.096 ppm, respectively, Cu, Mn and Zn contents were 0.109∼1.072 ppm. 0.829∼6.195 ppd and 0.731∼6.176 ppm, respectively. The trace metal concentrations of the agricultural products in Kwang-ju called clean area were within the background level which growth is facilitated.

• Journal of Soil and Groundwater Environment
• /
• v.11 no.5
• /
• pp.20-34
• /
• 2006

This study was undertaken to assess the anthropogenic impact on trace metal concentrations (Zn, Cu, Pb, Cr, Ni, and Cd) of roadside sediments (N = 70) from No.7 national road within the watershed of Hoidong Reservoir in Pusan City and to estimate the potential mobility of selected metals using sequential extraction. We generally found high concentrations of metals, especially Zn, Cu and Pb, affected by anthropogenic inputs. Compared to the trace metal concentrations of uncontaminated stream sediments, arithmetic mean concentrations of roadside sediments were about 7 times higher for Cu, 4 times higher for Zn, 3 times higher for Pb and Cr and, 2 times higher for Ni and As. Speciation data on the basis of sequential extraction indicate that most of the trace metals considered do not occur in significant quantities in the exchangeable fraction, except for Cd and Ni whose exchangeable fractions are appreciable (average 29.3 and 25.8%, respectively). Other metals such as Zn (51.4%) and Pb (45.2%) are preferentially bound to the reducible fraction, and therefore they can be potentially released by a pH decrease and/or redox change. Copper is mainly found in the organic fraction, while Cd is highest in the exchangeable fraction, and Cr and Ni in the residual fraction. Considering the proportion of metals bound to the exchangeable and carbonate fractions, the comparative mobility of metals probably decreases in the order of Cd>Ni>Pb>Zn>Cr>Cu. Although the total concentration data showed that Zn was typically present in potentially harmful concentration levels, the data on metal partitioning indicated that Cd, Ni and Pb pose the highest potential hazard for runoff water. As potential changes of redox state and pH may remobilize the metals bound to carbonates, amorphous oxides, and/or organic matter, and may release and flush them through drain networks into the watershed of Hoidong Reservoir, careful monitoring of environmental conditions appears to be very important.

• The Microorganisms and Industry
• /
• v.14 no.2
• /
• pp.11-12
• /
• 1988

심층지하에도 미생물은 존재하고 있는가\ulcorner 이러한 의문은 현재 미국에서 진행되고 있는 일련의 연구로 인하여 그 해답에 제시되고 있다. 심층 미생물 탐색 연구의 시작은 1981년에 시작한 Dept of Engergy (DOE)의 심층지하 운반계획(Subsurface Transport ; SST) 계획이었다. 이 계획의 주된 목적은 미량금속, 무기화합물및 방사능원소의 움직임 및 지하지층과 지하수에서의 수문학적 이동을 조절하는 지질화학, 수문학, 생물학적 과정에 대한 기초연구를 하는 것이었다. 여기에서 얻어진 정보는 지하환경에서 물질들이 이동하며 희석도고 있다는 것과 그에 대한 조건들을 제시해 주었다. 당시 많은 국가들이 심층 지하수를 이용하지만, 그에 대한 미생물 분포에 관한 지식은 거의 없었다.

• Journal of the Korean Chemical Society
• /
• v.45 no.2
• /
• pp.183-188
• /
• 2001

• Proceedings of the Optical Society of Korea Conference
• /
• 2003.07a
• /
• pp.176-177
• /
• 2003

진공 환경 및 가스에 함유된 미량의 수증기를 정량적으로 분석할 수 있는 계측기는 각종 산업 분야에서 그 필요성이 절실하다. 몇 가지 예를 들면 다음과 같다. 전구 속에 함유된 수증기로 인해 야기되는 텅스텐 필라멘트의 산화현상은 전구의 수명을 현저히 감소시킨다. 밀봉된 금속 전기소자 표면에 흡착된 수증기를 통해 누전 현상이 발생함으로써 소자가 비정상적으로 동작될 우려가 있다. 반도체 산업분야에서는 1 ppb의 수증기가 64 Mb DRAM 제조에 영향을 줄 수 있다는 것이 보고된 바 있다. (중략)

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1992.05a
• /
• pp.115-115
• /
• 1992

• The Korean Journal of Malacology
• /
• v.31 no.3
• /
• pp.195-201
• /
• 2015

This study was conducted to find out concentration of trace metal, survival rate, falling rate and structural changes of abalone, Haliotis discus hannai exposed to zinc chloride. Experimental groups were composed of one control condition and four exposure conditions (0.3, 0.8, 1.3, $1.8\;ZnCl_2\;mg/L$). The accumulation of trace metal (zinc) in abalone was significantly increased all exposure group. Though the exposure groups had lower survival rate than the control group, higher falling rate than the control group. Histopathological changes in the foot, gill and hepatopancreas of abalone revealed obvious with exposure group than control group.

• Journal of the Mineralogical Society of Korea
• /
• v.27 no.1
• /
• pp.31-40
• /
• 2014

In present study, we geochemically investigated the fresh coal ashes and the saline ash pond of an electric power plant in Korea, which burns imported bituminous coals. The goals are to see the chemical changes of the ash pond by reaction with coal ashes and to investigate the relative leachability of elements from the ashes by reaction with saline waters. For this study, one fresh fly ash, one fresh bottom ash, and 7 water samples were collected. All the ash samples and 2 water samples were analyzed for 55 elements. The results indicated that the fly ashes are enriched with chalcophilic elements such as Cu, Zn, Ga, Ge, Se, Cd, Sb, Au, Pb, and B relative to other elements. On the other hand, concentrations of As, Ba, Co, Ga, Li, Mn, Mo, Sb, U, V, W, and Zr are much higher in the ash pond than those dissolved in the seawater. Ag, Bi, Li, Mo, Rb, Sb, Sc, Se, Sn, Sr, and W show high ratios of elemental concentrations in pond water to those in the fly ash. Our results imply that the leaching of trace elements is regulated by geochemical controls such as solubility and adsorption even though the trace elements are relatively enriched on the ash surfaces after the coal combustion due to their volatilities.

• The Korean Journal of Mycology
• /
• v.21 no.4
• /
• pp.273-278
• /
• 1993

In order to determine of trace mineral elements of wild edible mushrooms in Korea, the dried carpophores of Armillariella mella(Vahl.ex Fr.) karst., Armillariella tabescens(Scop.) Sing., Lepista nuda(Bull.ex Fr.) Cooke and Lepista sordida(Schum.ex Fr.) Sing., Hygrophorus russula (Schaeff.ex Fr.) Qu'el., Hygrocybe conica(Scop.ex Fr.) Kummur were incinerated and analyzed by an atom adsorption spectrophotometry. The six mushrooms contained ubiquitously potassium, iron, zinc, sodium, manganase, copper and calsium in that order, and the content of potassium was the highest than other inorganic components and the content of zinc in Hygrocybe conica was especially the most than the other five mushrooms. Total contents of inorganic components(except Cd) were universally the highest in Hygrocybe conica than other five mushrooms, and decrease in order Hygrophorus russula, lepista nuda, lepista sordida, Aarmillariella mella and Armillariella tabescens. Calsium was not present in Amillariella mella and lepista nuda, and copper not in Hygro­cybe conica, and content of cadimium in Hygrophorus russula and Hygrocybe conica were trace.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2003.11a
• /
• pp.155-156
• /
• 2003

대도시내의 산업단지의 경우 주거지역과 인접하여 위치하고 있기 때문에 산업단지에서 발생하는 오염물질들은 시민들의 생활에 큰 영향을 미치고 있다. 그러나 국내에서는 아직 PM10의 장기적인 연구가 다소 미흡하고 가장 오염이 심하리라고 예상되는 산업단지에서 조차 PM10의 장기적인 자료가 없다. 따라서 장기간 자료에 근거한 대기 중 미량금속의 특성평가, 인체 위해도 분석 및 오염원 평가가 원활히 이루어지지 못하고 있는 실정이다. (중략)