• Nuclear Engineering and Technology
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• 제24권2호
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• pp.163-167
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• 1992

고순도알루미늄중 불순물의 Parameter로 이용될수 있는 구리의 비파괴 방사화분석법의 고찰 및 23종의 극미량불순성분원소의 함량을 분석하였다. 즉 구리의 분석은 원자로의 속중성자에 의한 27Al(n,$\alpha$)24Na반응으로 생성되는 24Na의 방사능을 감소시키기 위하여 Thermal Column을 이용하였고 다른 조사공을 이용한 경우보다 약 100 배 정 도 방해 요인을 감소시킬 수 있었다. 24Na 에 의한 영향은 2-3 %범위 이하이었다. 이 방법에 의해 표준알루미늄(6 nine class)시료로부터 구리를 정량하였고 아울러 기타 불순원소들을 일상 방사화분석법에 의해 정량하였다. 구리의 함량은 0.54$\pm$0.08 ppm이었다. 이러한 결과는 문헌값과 비교할때 타당성이 있었고 일상분석에 이용할 수 있는 좋은 방법으로 여겨진다.

• 자원환경지질
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• 제32권6호
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• pp.585-597
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• 1999

Plutomic rocks of the Mabogsan, located in the southestern part of the Koheung Eup are composed of granite gneiss, diorite, biotite grantie and granophyre. On the basis of Rb-Ba-Sr diagram, the diorires are plotted from granodiorite to quartz diortie, the biotite granites from granodiortie to anomalous granite and the granophyres in normal granite filed. The plutonic rocks tend to show the I-type characteristics in terns of ACF diagram, $K_2O-Na_2O$ diagram and $Al_2O_3/Na_2O+K_2O+CaO$ diafram, while have values of ilmenite series in magnetic subseptibility. The plutons could have formed in the tectonic environment of VAG+COLG+ORG based on the silica vs. trace element diagrams. Gold contents with major and trace elements have been determined for 21 granophyres, 13 biotite granites and 4 diorites are; (1) for the diorite, the rangs is 0.508~1.73 ppb with an average of 0.5ppb;(2) for the biotite granites, the range is 0.449~13.5ppb with an average of 3 ppb;(3)for the granphyres, the range is 0.508~23.1ppb with an average of 4.5ppb. The gold content of the studied plutons tends to increase from mafic to felsic rocks. Gold contents tend to show positive correlations with those of Ag and Zn, negative correlations with those of As, Ba and Rb. The copper contents of the plutons are comparatively high. Average copper contents of diorite, biotite granite and granophyre are 710ppm, 587ppm and 484ppm, respectively. The copper contents of the plutons tend to have good correlations with those of Ag, Bi and Pb.

• 대한화학회지
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• 제52권2호
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• pp.155-163
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• 2008

유기-실리카 이용한 잔유 구리(II)의 양을 빠른 추출을 위한 간단하고 재현성을 가지는 방법과 불꽃원자 흡수분광법으로의 검출에 대해 연구하였다. 공통으로 존재하는 이온은 분리와 검출에 간섭받지 않았다. 예비농축인자는 100 ml시료 용량에 대해 100 (1 ml 추출용량) 이 였다.제안된 방법의 검출한계는 1.0 ng ml-1이다. 최적조건하에서 흡착제의 최고흡수용량은 5 mg 구리/g 흡착제 였다. 최적조건하에서 상대표준편차는 2.8% (n=10)을 얻었다. 다양한 양의 구리(II)이온은 스파이크한 자연수와 합성수를 시험 시료로 하여 정확도 등을 시험하였다.

• 한국환경과학회지
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• 제16권10호
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• pp.1111-1118
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• 2007

A bismuth-coated carbon fiber microelectrode was prepared using cyclic voltammetry (CV). An analytical application was performed for the copper analysis with Square Wave Stripping Voltammetry (SWSV). Gallic acid n-propyl ester (PG) was used for the complex formation with a copper ion, and electrochemical measurements were performed with a pre-amplifier of a low-current module for nano am per detection. The effects of various parameters on the response were optimized. Analytical working ranges of $0.03-25.9\;{\mu}gl^{-1}$ and $0-25\'mgl^{-1}$ Cu(II) were obtained. The relative standard deviation at $13\;mgl^{-1}$ Cu was 0.9% (n = 12) in optimum conditions. The detection limit was found to have been $0.019\;{\mu}gl^{-1}$, with a 30-sec accumulation time. The developed methods were applied to a copper assay in water samples.

• 한국초지조사료학회지
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• 제36권3호
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• pp.191-198
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• 2016

This study evaluated the effects of TMC (trace mineral-fortified microbial culture) supplementation on growth performance, carcass characteristics, and meat quality parameters of Hanwoo steers during the last 4 months of finishing period. The TMC was a combination of 0.4% trace minerals, 20.0% Na-bentonite, and 79.6% feedstuffs, which was inoculated with a mixed microbial culture (Enterobacter ludwigii, Bacillus cereus, B. subtilis, Lactobacillus plantarum, and Saccharomyces cerevisiae). Twenty-four steers were blocked by initial BW ($634{\pm}16kg$) and randomly allocated to one of two treatments (control vs. 3.3% TMC). The effect of TMC supplementation on the growth performance was not significant. There was no incidence of urolithiasis in TMC-fed steers. However 3 out 12 steers (25%) fed the control diet were observed to have urinary calculi. The carcass yield and meat quality parameters were not affected by TMC supplementation, however marbling score was increased in TMC-fed steers (P = 0.08). There was no effect of TMC treatment on the chemical composition of longissimus dorsi muscle (LM). The TMC supplementation increased concentrations of manganese (P < 0.01), cobalt (P = 0.02), iron, and copper (P = 0.06) in LM. In conclusion, TMC treatment did not negatively affect growth performance and meat quality parameters, and positively affected the trace minerals profile of LM.

• 대한화학회지
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• 제51권2호
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• pp.141-146
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• 2007

2-mercaptobenzimidazol을 착화제로 사용하여 천연수 중 흔적량의 구리를 분리-예비농축-정량하는 과정을 보고한다. 이 방법은 황산소듐도데실과 γ-알루미나를 물속에서 혼합할 때 γ-알루미나 위에 형성되는 계면활성제 응집체에 기반을 두고 있는데, 2-mercaptobenzimidazol이 산성 매질 속에서 생성된 부가미셀 내부의 소수성 부분으로 들어가 구리 이온의 예비농축과 정량에 적합한 조립체가 된다. 수용액으로부터 μg/ml 수준의 구리이온을 흡착제로 흡착하는 최적 실험조건을 알아내었다. 구리 이온은 pH 7.1-8.0 범위에서 흡착제에 정량적으로 흡착되며 설포살리산을 용리액으로 사용하여 정량적으로 탈착할 수 있다. 용액 중의 다른 이온은 구리 이온의 정량을 방해하지 않았으며, 이 방법을 강물 분석에 적용하니 상대표준편차가 4.91%였다.

• Asian-Australasian Journal of Animal Sciences
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• 제14권3호
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• pp.382-383
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• 2001

The experiment was undertaken to study the effect of subclinical mastitis on the biochemical parameters of milk in crossbred (Sahiwal $\times$ Jersey) cows. Subclincial mastitis was judged using California Mastitis Test and graded on a scale of 0 to 2. Twenty six milk samples of each grade were subjected to somatic cell count. Separated milk whey was analysed for total protein, immunoglobulin and trace mineral content. Results indicate linear increases in somatic cell count, total protein and immunoglobulin concentrations in milk with increase in grade of subclinical mastitis. However, copper, zinc, manganese and iron concentration in milk was not affected by grade of mastitis.

• Asian-Australasian Journal of Animal Sciences
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• 제23권1호
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• pp.68-73
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• 2010

The aim of the present study was to determine the changes in mineral retention of broiler chicks fed diets based on wheat, sorghum or maize during the first two weeks post-hatch. The retention of five major minerals (calcium, phosphorus, potassium, sodium and magnesium) and four trace minerals (iron, manganese, zinc and copper) was determined on days 3, 5, 7, 9 and 14 of age. The retention coefficients of individual minerals differed widely and the retention coefficients of major minerals were found to be considerably higher than those of trace minerals. Age effects were significant (p<0.05) for all minerals. In general, mineral retention coefficients were highest at day 3, declined to day 7, and remained unchanged to day 14. Decline in mineral retention with age was similar on all three diets. The cereal effect was significant (p<0.05) for several minerals, with a general tendency for the sorghum-based diet to have greater retention than maize- or wheat-based diets.

• 생약학회지
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• 제8권2호
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• pp.61-68
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• 1977

The content of micro inorganic compounds in the 145 kinds of crude drugs on market was determined with Model 207 Atomic Absorption Spectrophotometer and Model 306 Flameless A.A. Content of Fe, Cu, Ni, Mn, Cd, Cr, Sn, and Pb was examined and the results revealed that the crude drugs which are using as a hematics and emmenagogues contained high content of iron, and those which are using as a antiinflammatory and emmenagogues contained high content of copper. Aromatic stomachics contain manganese and zinc, and diuretics and antiinaflammatory agents do tin. High content of Ni was found in tonics, but chronium and cadmium were not detected in crude drugs. There were no differences of content of trace metals in the various site of plants used.

• 한국식품영양과학회지
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• 제26권5호
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• pp.851-859
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• 1997

This study was perfomed to investigate the contamination level of harmful heavy metals and the level of trace elements in 15 kinds of fish collected at the western coast in Korea from July to December in 1996. The levels of total lead, cadmium, mercury, iron, copper and zinc were determined and the results were summarized as follows: The minimum and maximum values(ppm) of fish, mean value bracketed, were ; Pb : 0.02~4.80(2.26), Cd: 0.001~0.54(0.04), Hg: 0.007~1.08(0.52), Fe: 7.76~66.39(25.70), Cu; 0.37~121.6(1.90), Zn:12.01~112.10(54.78). The results show that mean contents of Pb, Cd and Hg in 15 species fish were not yet dangerous levels enough to cause a health problem. But the contents of Pb and Hg tend to increase.