• 한국축산식품학회지
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• 제27권3호
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• pp.284-289
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• 2007

본 연구는 비육돈 사료내 구리와 아연의 수준별 급여가 생산성, 영양소 소화율, 육질 및 도체 특성에 미치는 영향을 알아보기 위해 실시하였다. 3원 교잡종$(Landrace{\times}Yorkshire{\times}Duroc)$ 비육돈 72두를 공시하였으며, 시험개시 시의 체중은 58.47 kg이었다. 시험설계는 $2{\times}3$ 요인설계(Cu $level{\times}Zn$ level)에 의해 6개 처리로 하여 처리당 3반복, 반복당 4두씩 완전임의 배치하였다. 본 연구에 사용된 구리와 아연의 공급원은 각각 Cu-methionine chelate와 Zn-methionine chelate 이었으며, 사료내 함량은 각각 10, 30 및 60 ppm과 80 및 120 ppm 이었다. 전체사양시험기간 동안 ADG와 ADFI에서는 구리 함량, 아연 함량 및 상호작용에 대한 유의한 효과가 나타나지 않았다. 사료효율에서는 유의한 상호작용이 나타났는데(p<0.05), 구리와 아연함량이 각각 30과 120 ppm일때 가장 높게 나타났다. 건물 소화율에서는 구리 함량(p<0.02), 아연 함량(p<0.01) 및 상호작용(p<0.04)에 대한 유의한 효과가 나타났는데, 구리함량이 감소할수록 증가하였고, 아연 함량은 증가할수록 증가하였으며, 구리와 아연 함량이 각각 30과 120 ppm일 때 가장 높게 나타났다. 질소 소화율에서는 아연 함량(p<0.01)과 상호작용(p<0.03)에서 유의한 효과가 나타났는데, 아연 함량이 증가할수록 증가하였고 구리와 아연 함량이 각각 30과 120 ppm일때 가장 높게 나타났다. 명도를 나타내는 $L^*-$값, 전단력, 가열감량 및 pH에서는 유의한 효과가 나타나지 않았다. 적색도를 나타내는 $a^*-$값 (p<0.04)과 황색도를 나타내는 $b^*-$값 (p<0.01)에서는 아연함량에 대한 효과가 나타났는데, 사료내 아연 함량이 감소할수록 증가하였다. 보수력에서는 유의한 상호작용이 나타났는데(p<0.01), 구리와 아연 함량이 각각 10과 120 ppm일 때 가장 높게 나타났다. 도체중, 등지방 두께, 도체등급에서는 유의한 효과가 나타나지 않았다. 도체율에서는 유의한 상호작용이 나타났는데(p<0.04), 구리와 아연 함량이 각각 30과 120 ppm일때 가장 높게 나타났다. 결론적으로 비육돈 사료내 구리와 아연의 함량이 각각 30 ppm과 120 ppm일때 사료효율, 영양소 소화율 및 도체율을 개선시켰으면 각가 10 ppm과 120 ppm일때 보수력을 개선시켰다.

• Journal of Magnetics
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• 제11권2호
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• pp.98-102
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• 2006

It was examined in this study that magnetic beads, which are assumed to be environmentally functional, could be effective in processing heavy metals that are water pollutants. For the purpose, magnetic beads containing carboxyl groups, which has strong binding force with heavy metals, are mixed with each Cd, Pb, Ni, Cu and Cr(III) solution, then stirred in pH 6. As a results of the process, it was proven that heavy metals bind quickly with magnetic beads through the reaction. In order to analyze heavy metal concentration, magnetic beads bind with heavy metal were collected by external magnetic force and dissolved in acid. The graphite furnace AAS was used to get heavy metal concentration melted in the acid solution. The results showed that heavy metal extractions by magnetic beads were influenced by the type and the concentration of a heavy metal, and over 90% of a heavy metal can be extracted in ppm level save for Cr(III). It was also examined in the study whether heavy metal extraction is influenced when other ions exist in each heavy metal solution. According to experiment, adding other heavy metals to a solution did have little influence on extracting an intended heavy metal. But in case salt or heavy metal chelate was added, Ni extraction changed sensitively although extracting other heavy metals were influenced only when the concentration of an added substance is high. In conclusion, it was shown that magnetic beads could be used to treat wastewater with relatively high heavy metal concentration.

• Bulletin of the Korean Chemical Society
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• 제32권2호
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• pp.590-594
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• 2011

An aminocarboxy aspartic acid-bonded silica (Asp-Silica) stationary phase was synthesized using L-aspartic acid as ligand and silica gel as matrix. The standard protein mixtures were separated with prepared chromatographic column. The effects of solution pH, salt concentration and metal ion on the retention of proteins were examined, and also compared with traditional iminodiacetic acid-bonded silica (IDA-Silica) column. The results show that Asp-Silica column exhibited an excellent separation performance for proteins. The retention of proteins on Asp-Silica stationary phase was consistent with electrostatic characteristic of cation-exchange. The stationary phase displayed typical metal chelate property after fixing copper ion (II) on Asp-Silica. Under competitive eluting condition, protein mixtures were effectively isolated. Asp ligand showed better ion-exchange and metal chelating properties as compared with IDA ligand.

• 자원리싸이클링
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• 제7권2호
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• pp.9-15
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• 1998

석유 탈황 폐촉매 중의 바나듐을 습식법으로 회수한 후의 라피네이트로부터 몰리브덴을 회수하기 위한 연구를 수행하였다. 이 라피네이트의 조성은 Mo 1,100 ppm, V150ppm, Al 19 ppm, Ni 33 ppm으로 이루어져 있으며, 이 수용액 중의 몰리브덴을 효율적으로 분리.회수하기 위하여, 킬레이트수지에 의한 흡착 또는 3급 아민에 의한 용매추출법에 의하여 분리하는 방법을 적용하였다. 킬레이트수지에 의한 Mo의 흡착은 폴리에틸렌 아민형 킬레이트수지에 의하여 몰리브덴을 선택 흡착시킨 후, $3.0mol/{dm}^{3}$-$NH_4$OH을 용리제로 사용하여 $60g/{dm}^{3}$의 몰리브덴으로 농축할 수 있었다. 한편, 용매추출법으로는 2N-HCl으로 접촉시켜 전처리한 10vol%-Alamine 336에 의하여 몰리브덴이온은 전 pH 범위에서 100%의 추출율을 나타내었다.

• 분석과학
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• 제24권3호
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• pp.231-235
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• 2011

A spectrofluorimetric method for the determination of EDTA in real samples such as mayonnaise, powder detergent and cleansing cream with tiron (4,5-dihydroxy-1,3-benzenedisulfonic acid) as a fluorimetric reporter was developed. When tiron is chelated with Cu(II), the fluorescent intensity is decreased by a quenching effect. However, when Cu(II)-tiron chelate reacts with EDTA, fluorescent intensity is increased as tiron is released. Several experimental conditions such as pH of the sample solution, the amount of Cu(II), the amount of tiron, heating temperature and heating time were optimized. Fe(III) interfered more seriously than any other ions, interference of Fe(III) could be disregarded, because Fe(III) was scarcely contained in selected real samples. The linear range of EDTA was from $8.0{\times}106{-8}\;M$ to $2.0{\times}10^{-6}\;M$. With this proposed method, the detection limit of Fe(III) was $5.2{\times}10^{-8}\;M$. Recovery yields of 92.7~99.3% were obtained. Based on experimental results, it is proposed that this technique can be applied to the practical determination of EDTA.

• Bulletin of the Korean Chemical Society
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• 제18권11호
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• pp.1162-1166
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• 1997

Nature of palladium(Ⅱ) complexes with 7-membered chelates was studied by experimental and theoretical methods on a Pd(L)Cl2 system, where L is Ph2PNHCH2CH2NHPPh2(L1), Ph2PNHC6H4NHPPh2(L2). The palladium(Ⅱ) complexes were prepared and characterized by elemental analysis, IR, UV, 1H, and 31P NMR spectroscopy. Ab initio calculations with geometry optimizations were also performed for related model systems, Pd(L)Cl2; L=R2PNH(CH2)2NHPR2(L3), R2PNHC6H4NHPR2(L4), R2P(CH2)4PR2(L5), R2PCH2(C6H4)CH2PR2(L6); R=H, CH3.

• 한국환경보건학회지
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• 제18권2호
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• pp.106-116
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• 1992

In order to examine the influences of diluent, DVB, and ligand content, in the adsorption velocities and capacities of chelating resins to heaw metal ions, the chelating resins containing the PO$_3$H, amide, and PO$_3$H+amide were prepared from AN-STR-DVB copolymer. The adsorption capacities of chelating resins were measured by ICP-AES. The major results of the studies are as follows: The optimized compositions of the chelating resins having the highest adsorptivity for the heavy metal ions were found to be DVB=7 wt%, toluene= 100 vol%. The adsorption rate of the chelating resins to the heaw metal ions was PO$_3$H > PO$_3$H+Amide > Amide in order.

• Bulletin of the Korean Chemical Society
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• 제7권5호
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• pp.338-341
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• 1986

Hydrocarbon solution of $Ir(PPh_3)_2(CO)OClO_3$ reacts with $Ph_2PC_6H_4$-o-CHO and 3-methyl-2-aminopyridinyl aldimine to yield ${\bar{Ir(Ph_2PC_6H_4-o-CO)}}\;(PPh_3)_2(CO)(H)ClO_4$(1) and ${\bar{Ir(NC_6H_6NC}}C_6H_5)(PPh_3)_2(CO)(H)ClO_4$(2), respectively. The compound $Ir(PPh_3)_2N_2Cl$ also reacts with $Ph_2PC_6H_4$-o-CHO and 3-methyl-2-aminopyridinyl aldimine to give ${\bar{Ir(Ph_2PC_6H_4-o-C}}O)(PPh_3)_2(H)Cl(3)$ and $Ir(NC_6H_5NCC_6H_5(PPh_3)_2(H)Cl(4)$, respectively. Compounds 1, 2, 3, and 4 were characterized by infrared, $^1H$ NMR, $^{31}p$ NMR, UV spectra, and conductivity measurements.

• 공업화학
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• 제4권4호
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• pp.672-682
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• 1993

sodium amide에 의한 methylpropyl ketone과 ethyl acetate의 반응으로 2, 4-heptadione(이하 24HTD)을 합성하고, 클로로포름 용매하에 Cu(II)의 용매추출 실험으로부터 추출평형 및 추출속도 특성을 고찰하였다. 흡광도와 Cu(II)의 농도변화 측정으로부터 24HTD의 분배계수와 해리정수, 24HTD와 Cu 착화합물의 안정도 상수, 분배계수 및 총괄추출 평형정수 등을 구하고 추출기구를 구명하였다. 24HTD에 의한 Cu(II)의 추출 화학종은 1:2의 형태인 $CuR_2$였으며, 24HTD-클로로포름에 의한 Cu(II)의 총괄 초기 추출속도는 $R_0=k[\bar{HR}]([Cu^{2+}]/[H^+])^{0.5}$로 표시되었다.

• 한국환경과학회지
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• 제8권3호
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• pp.411-417
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• 1999

The interfacial chemical behavior, lattice exchange and dissolution, of $FeS_{(S)}$ as one of the important sulfide minerals was studied. Emphases were made on the surface characterization of hydrous $FeS_{(S)}$, the lattice exchange of Cu(II) and $FeS_{(S)}$, and its effect on the dissolution of $FeS_{(S)}$, and also affect some organic ligands on that of both Cu(II) and $FeS_{(S)}$. Cu(II) which has lower sulfide solubility in water than $FeS_{(S)}$ undergoes the lattice exchange reaction when Cu(II) ion contacts $FeS_{(S)}$ in the aqueous phase. For heavy metals which have higher sulfide solubilities in water than $FeS_{(S)}$, these metal ions were adsorbed on the surface of $FeS_{(S)}$. Such a reaction was interpreted by the solid solution formation theory. Phthalic acid(a weak chelate agent) and EDTA(a strong chelate agent) were used to demonstrate the effect of organic lignads on the lattice exchange reaction between Cu(II) and $FeS_{(S)}$. The $pH_{zpc}$ of $FeS_{(S)}$ is 7 and the effect of ionic strength is not showed. It can be expected that phthalic acid has little effect on the lattice exchange reaction between Cu(II) and $FeS_{(S)}$. whereas EDTA has very decreased the removal of Cu(II) and $FeS_{(S)}$. This study shows that stability of sulfide sediments was predicted by its solubility. The pH control of the alkaline-neutralization process to treat heavy metal in wastewater treatment process did not needed. Thereby, it was regarded as an optimal process which could apply to examine a long term stability of marshland closely in the treatment of heavy metal in wastewater released from a disussed mine.