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

• Journal of Aquaculture
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• v.1 no.2
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• pp.109-119
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• 1988

Following the previous study on the nutritional quantity of Al, Fe, and their interrelationships with other trace metals, this study was conducted to determine the effect of supplementation of Cu and Mn to fish meal-diets on the growth of Japanese eel. The feeding experiment to determine Cu requirement was conducted using white fish meal-diets supplemented with 0, 5, 10, or 20 $\mu$g/g cupric sulfate, and that to determine Mn requirement was conducted by suppling the diet with 0, 10, 20, or 40 $\mu$g/g manganese sulfate. The results revealed that the fish on diet annexed with 5 $\mu$g/g of Cu were observed to have the best growth among these groups. In case of Mn, 20 $\mu$g/g of supplementary level promoted growth rate and 40 $\mu$g/g of diet resulted in the highest feed efficiency. On the other hand, the highest level of Cu (20 $\mu$g/g), and Mn (40 $\mu$g/g) supplementary diets did not expressed adverse effect on growth. These results indicated that the suitable Cu and Mn supplementary concentrations are 20 $\mu$g/g and 30 $\mu$g/g of formulated the white fish meal-diet respectively. The white fish meal had 1.6 $\mu$g/g of Cu and 6.1 $\mu$g/g of Mn.

• Economic and Environmental Geology
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• v.40 no.5
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• pp.587-604
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• 2007

In order to investigate the vertical variations and speciations of trace elements, and their correlations in Hoidong reservoir, sediment cores (21-41 cm below surface) and interstitial water samples were collected from five sampling locations. The total average concentrations of trace metals in sediment core samples were $232{\pm}30.8mg/kg$ for Zn, $119{\pm}272mg/kg$ for Cu, $58.4{\pm}4.1mg/kg$ for Pb, $15.7{\pm}3.3mg/kg$ for Ni and $1.6{\pm}0.3mg/kg$ for Cd. The total concentrations of trace metals in core sediments generally decreased toward the center of the Hoidong reservoir. The total concentrations of Mn, Pb and Zn decreased with depth for all the sample locations, while Cu and Fe concentrations increased. The trace metal concentrations of interstitial water sample were in the order of Fe>Mn>Cu>Zn, but Cd, Ni and Pb were not detected. The concentrations of Zn, Cu, Fe and Mn in the interstitial water samples showed a tendency of increasing toward the bottom of the core, suggesting a possible upward diffusion. This migration of trace metals may lead to their transfer to the sediment-water interface. These trace elements would be subsequently fixed onto amorphous Fe and Mn-oxides and carbonates in the topmost layer of sediment. Based on the $K_D$ values, the relative mobilities of the studied metals were in the order of Mn>Cu>Zn>Fe. Geochemical partitioning confirmed that surface enrichment by trace metals mainly resulted from a progressive increase of the concentrations in the fractions II and III. Copper, Fe, Mn and Zn concentrations of interstitial water were closely correlated with their exchangeable fractions of sediments.

• Clinical and Experimental Pediatrics
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• v.48 no.4
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• pp.406-410
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• 2005

Purpose : Anticonvulsants have a number of side effects and some of them may be attributed to a disturbance of serum trace metal homeostasis. Although they are minor building components in tissues, they play important functional roles in the peripheral and central nervous system. We measured serum copper and zinc levels in epileptic children who were treated with anticonvulsants to know the effects of anticonvulsants on serum copper and zinc levels. Methods : Serum copper and zinc levels were determined in 64 epileptic patients receiving anticonvulsant therapy in Chungnam National University Hospital, and in 20 normal controls. Sixty-four epileptic patients were divided into three groups : 16 patients who were treated with valproic acid monotherapy; 26 patients who were treated with valproic acid in addition to other anticonvulsants; and 22 patients who were treated with anticonvulsants except for valporic acid. Results : All patients receiving anticonvulsants had significantly lower serum copper levels($80.21{\pm}19.42{\mu}g/dL$) in comparison to the normal controls($102.12{\pm}32.8{\mu}g/dL$). Serum zinc levels in patients receiving anticonvulsants($79.78{\pm}21.88{\mu}g/dL$) were not statistically different from those of controls ($85.26{\pm}29.81{\mu}g/dL$). There were no significant difference of serum copper and zinc levels among the three groups. Conclusion : In this study, we clearly showed that anticonvulsants decreased serum copper levels. Although we did not observe any clinical findings related to copper deficiency, we should pay attention to potent copper deficiency in patients with anticonvulsant treatment.

• Journal of Conservation Science
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• v.26 no.2
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• pp.157-169
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• 2010

This study focused on the material characteristics and archaeometric relationship between the molten glass and bronze materials within the crucibles and gilt-bronze Bodhisattva statue excavated from the Ssangbukri site in Buyeo, Korea. Yellowish green to red brown vitreous material in the crucibles was identified as lead glass which contained scarce amount of BaO, and low $Al_2O_3$ and CaO. Metallic molten material was identified as bronze of copper-tin-lead alloy with low amount of impurities that indicated well-refined materials. Also, cassiterite was used for raw metal ore of tin. The Bodhisattva statue consisted of major copper with trace impurities in the core metal, and gold amalgam in the gilded layer. Though lead isotopic analysis showed contradictory results in each lead glass, bronze and Bodhisattva statue that required further examination, it could be stated that the statue was made in the Ssangbukri site based on the high-level technical skills of bronze production.

• Korean Journal of Environment and Ecology
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• v.22 no.3
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• pp.241-248
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• 2008

We studied concentrations of trace elements such as iron, zinc, copper, lead and cadmium in three shorebird species from Saemankeum mudflat, Korea$(1999{\sim}2000)$, and also analysed correlations between elements in livers. Iron(ANOVA, p=0.018), copper(ANOVA, p=0.043), lead(ANOVA, p=<0.001) and cadmium (ANOVA, p=0.016) concentrations significantly differed among shorebird species, but zinc concentrations wasn't different among species. We suggested that iron, zinc, and copper concentrations were within a range for normal and are maintained by normal homeostatic mechanisms for wild birds. Lead concentrations in Great Knots Calidris tenuirostris$(5.76{\pm}2.14{\mu}g/dry\;g)$ were at the background level but Red-necked Stints Calidris ruficollis$(29.4{\pm}10.6{\mu}g/dry\;g)$ and Terek Sandpipers Xenus sinereus$(15.9{\pm}11.9{\mu}g/dry\;g)$ were within the exposed level for wild birds. In particular, Red-necked Stints were nearly poisoned level. Cadmium concentrations in Terek Sandpipers and Great Knots were at the background concentration, but Red-necked Stints were greater than the poisoned level$(3{\mu}g/dry\;g)$. We found significantly correlations between lead and cadmium concentrations, but other elements didn't find.

• Korean Journal of Heritage: History & Science
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• v.43 no.3
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• pp.102-121
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• 2010

Three bronze bells excavated from the Hoeamsa temple site were investigated for their microstructures and chemical compositions in an effort to understand the technology applied in fabrication, which may represent the related industry established in the early Joseon period. The result shows that the bells were cast from alloys of approximately 85% copper-8% tin-7% lead. The chemical analysis for ten trace elements shows that they were all kept below 0.3 weight %, suggesting that the alloys were made of relatively well-refined copper, tin and lead. The presence of sulfur and iron indicates that chalcopyrite or chalcocite may have been used in the smelting of copper. Evidence has been found that the bells were cast by pouring the liquid metal from the top of the sand molds that were set up in an upright position. No additional treatments, thermal or mechanical, other than a little grinding were applied upon the completion of casting. After the shaping process, a balancing plate was attached to the top of the bell using a steel connection ring. The connection assembly was then fixed to the main body by using molten bronze as a solder. The surface inscription was found carved using different techniques. The differences in the order of strokes and the calligraphic style indicate that the carving was carried out by more than one master. In the absence of documentary evidence on past bronze technology, the present bronze bells with known chronology, provenance and the main agent of production, prove to be a rare and valuable archaeological material for the understanding of the related technology in use in the early Joseon period.

• Applied Biological Chemistry
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• v.23 no.3
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• pp.141-149
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• 1980

Contents of heavy metals in various bran layers of rice collected from Kyeong Nam province in 1978, were determined. The components of crude prote in, crude fat, crude cellulose, and ash in all the rice samples were found to be most concentrated in the rice of each layer of brown, 70% polished, and 90% polished, but the contents of crude protein (9.22%), crude fat (1.16%), crude cellulose (1.01%), and ash (0.38%) in polished rice decreased rapidly. On the other hand, the amounts of nitrogenfree extract in the rice were showed increasingly toward the inner layer and those of polished rice were 75.54%. The contents of lead, zinc, nickel, cadmium, and arsenic in bran layer of rice decreased in order of that of 90% polished, 70% polished, brown, and polished rice. Their amounts in polished rice were lead, $0.054{\sim}0.610ppm$; zinc, $9.830{\sim}19.093ppm$; nickel, trace-1.776ppm; cadmium, trace-0.039ppm; arsenic, ND-0.170ppm. It was shown that copper was more concentrated in the layer of 90% polished rice $(0.581{\sim}1.476ppm)$, and iron more in brown rice $(27.971{\sim}66.569ppm)$ than in any other portion, whereas mercury $(0.006{\sim}0.072ppm)$, chromium $(1.538{\sim}7.822ppm)$, and manganese $(57.371{\sim}179.252ppm)$ were much contained in the layer of 70% polished rice. Their amounts in polished rice were copper, $0.218{\sim}0.858ppm$; iron, $1.480{\sim}9.573ppm$; mercury, $0.006{\sim}0.027ppm$; chromium, ND-1.520ppm; and manganese, $6.730{\sim}11.562ppm$.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.4
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• pp.446-452
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• 2010

Five year term study from 2002 to 2006 was carried out to examine the effects of continuous long-term application of swine liquid manure on soil chemical properties including heavy metal contents and yield of tomato (Lycopersicon esculentum) and cucumber (Cucumis sativus L.) in a greenhouse. Treatments were conventional chemical fertilizers and three types of swine slurry; Slurry composting and biofiltration (SCB), Thermophilic aerobic oxidation (TAO), and Bio-mineral water (BMW). Total nitrogen level of the SCB, TAO, and BMW was 0.47%, 0.09%, and less than 0.01%, respectively. The heavy metal contents of the three liquid manures were much lower than the Korean regulation level. The soil phosphorus, potassium, and heavy metal contents after five year continuous application of swine slurry were not significantly higher than those of chemical fertilizer use. Contents of heavy metals in leaves of the crops did not show significant difference among treatments. The levels of copper and zinc, plant essential elements, in leaves were in the range of optimum plant growth. Yields of tomato and cucumber for swine liquid manures were not significantly different from that of chemical fertilizer. The results implied that the three types of swine slurry may not deteriorate soil chemical properties including phosphate and trace elements in greenhouse soils when they are applied as a basal fertilization at a recommended nitrogen rate based on soil testing.

• Nutritional Sciences
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• v.2 no.2
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• pp.88-92
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• 1999

The purpose of this study was to study the intake of heavy metals such af arsenic, lead and cobalt and the relationship of dietary heavy metals with serum iron, topper, and zinc, which play important roles in hematopoiesis, in healthy college women living in Choongnam Korea, where we have detected heavy metals (As, Pb, Co) in some marine products in previous studies. The nutritional status of the subjects (35 women) was evaluated by anthropometric measurements, 24-hr dietary recall for 3 days. And 3-day diets (by weighing method) and blood were collected to analyze As, Pb, Co, Fe, Cu, Zn, Hb, Hct, and MCHC. The mean age, height, weight, and BMI were 20 years, 158 cm, 55 kg and 22.42 kg/$m^2$, respectively. The mean daily energy intake was 85.85% of RDA for Koreans. The ratio of energy from carbohydrate, protein, and fat was 60 : 24 : 16. The mean daily intake of heavy metals (As, Pb, Co) was 1.77 mg/day, 75.21 $\mu$g/day and 21.12 $\mu$g/day. And the mean daily intake of iron, copper, and Zinc concentrations were 97, 68, and 92% of normal values. The mean serum heavy metals (As, Pb, Co) were 16.14 $\mu$g/dl, 4.32 $\mu\textrm{g}$/dl and 0.02 $\mu$g/dr, respectively Mean blood levels of Fe, Cu, Zn, Hb, Hct, and MCHC were at normal levels. Dietary heavy metals except Co were not significantly different from serum Fe, Cu, Zn and Hb, Hct, and MCHC. However, there was a tendency toward lower serum concentration of Fe, Hb, Hct, and MCHC in the subjects with higher heavy metals (As) intake. Among heavy metals, only dietary Co showed a significant negative correlation with Hb (p< 0.001) and Hct (p < 0.001).