• 제목/요약/키워드: 1-Nitroso-2-naphthol

검색결과 7건 처리시간 0.023초

Column Preconcentration and Determination of Cobalt(II)Using Silica Gel Loaded with 1-Nitroso-2-naphthol

  • Shin, Eun-Mi;Choi, Hee-Seon
    • Bulletin of the Korean Chemical Society
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    • 제30권7호
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    • pp.1516-1520
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    • 2009
  • A sensitive technique for the determination of trace Co(II) in various samples after column preconcentration by adsorbing onto silica gel loaded with 1-nitroso-2-naphthol was developed. Several experimental conditions, such as pH of sample solution, the amount of silica gel loaded with 1-nitroso-2-naphthol, the flow rate for adsorption and so forth, were optimized. The interfering effects of diverse concomitant ions were investigated. Fe(III) interfered with more than any other ions, but the interference by Fe(III) was completely eliminated by adjusting the amount of silica gel loaded with 1-nitroso-2-naphthol to 0.30 g. The dynamic range, the correlation coefficient ($R^2$), and the detection limit obtained by the proposed technique were 3.0-140.0 ng m$L^{-1}$, 0.9942, and 1.81 ng m$L^{-1}$, respectively. For validating the technique, the aqueous samples (tap water, reservoir water, stream water, and wastewater) and the plastic samples were used as real samples. Recovery yields of 93.0-107.0% were obtained. These measured data were not different from ICP-MS data at the 95% confidence level by F test. Based on the results of the experiment, it has been found that the proposed technique can be applied to the determination of Co(II) in various real samples.

1-Nitroso-2-naphthol 침전제를 사용한 연속흐름 선농축법에 의한 코발트의 정량분석 (Quantitative Analysis of Cobalt with Continuous Flow Preconcentration Using 1-Nitroso-2-naphthol as an Organic Precipitant)

  • 임갑수;박용남
    • 대한화학회지
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    • 제43권6호
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    • pp.644-650
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    • 1999
  • 본연구에서 유기 침전제를 사용하여 수용액중의 코발트를 on-line으로 연속 침전시켜 선농축하는 방법을 연구하였다. 침전제로 1-nitroso-2-naphthol을 사용하여 라인내에서 직접 침전시킨 뒤 MlBK(Methyl lsobutyl Ketone)로 용해시켜 불꽃 원자흡수 분광기로 보내어 분석하였다. 최적조건을 구하고 농축배율을 연구한 결과 대개 0.5 ppm의 코발트 시료 1.0 mL를 사용하였을 때 13배의 농축율을 얻었으며 시료 처리 속도는 시간당 I0개 정도 이었다. 부피를 10.0 mL로 증가시키면 시료의 처리속도는 늦어지지만 농축비를 68배로 높일 수 있었다. 본 연구의 정확성을 알기 위해 합성된 준 표준 생체시료를 분석한 결과 4%의 상대 표준편차를 가지고 예상치에 근접하는 좋은 결과를 얻을 수 있었다.

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금속 니트로소 R염 착물을 이용한 염기성 의약품 선택성 전극의 특성 (Potentiometric Characteristics of Nitroso.R-Salt-Metal Complex Based Basic Drug Selective Electrodes)

  • 이미나;안문규
    • 약학회지
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    • 제47권6호
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    • pp.356-360
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    • 2003
  • Nitroso-2-naphthol-3,6-disulfonic acid, disodium salt (NRS) was used as an organic ligand to prepare basic drug-selective polymeric membrane electrode. The sensing membrane of the electrode consited of basic drug-meta1(II)-NRS as an ion-exchanger site in a poly(vinyl chloride) matrix plasticized with 2-nitrophenyl octyl ether (NPOE). The metal ions used were Fe$^{2+}$, Co$^{2+}$, Ni$^{2+}$ and Cu$^{2+}$. The electrodes exhibited fast and wide linear response in the basic drug concentration of 10$^{-5}$ ∼10$^{-3}$ mol/l with a response slope of 50∼60 mV/decade in a buffer solution of pH 4∼8. The electrodes exhibited good selectivity for many basic compounds.mpounds.

Reduction of Nitrosoarene by Purified NAD(P)H-Quinone Oxidoreductase

  • Kim, Kyung-Soon;Suk, Hee-Won
    • BMB Reports
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    • 제32권4호
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    • pp.321-325
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    • 1999
  • NAD(P)H-quinone oxidoreductase (EC 1. 6. 99. 2) was purified form S. cerevisiae. The enzyme readily reduced 2,6-dichlorophenolindophenol, a quinonoid redox dye, as well as substituted benzo- and naphthoquinones, and could accept electrons from either NADH or NADPH. The purified NAD(P)H-quinone oxidoreductase turned out to be capable of reducing nitrosoarenes as well as a variety of quinones. A chemical-trapping technique using 4-chloro-1-naphthol was used to show that the N,N-dimethyl-p-benzoquinonediiminium cation was produced in the reduction of 4-nitroso-N,N-dimethylaniline catalyzed by NAD(P)H-quinone oxidoreductase.

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감성물질의 마이크로캡슐화에 의한 감성기능 섬유의 개발(II) -감광변색 기능섬유- (Development of Susceptible Functional Fibers using the Microcapsule of Susceptible Materials(II) ―Photochromic functional fibers―)

  • Kim, Moon Sik;Park, Sun Ju;Lee, Shin Hee;Park, Soo Min
    • 한국염색가공학회지
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    • 제8권1호
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    • pp.73-82
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    • 1996
  • The photochromic dye(spiroxazine, Blue) as a susceptible material was synthesized by condensing 1-nitroso-$\beta$-naphthol with indoline. The melting point of the synthesized spiroxazine dye was 254$^{\circ}C$. Irradiation with ultraviolet light had effect on reversible coloration reaction. The photochromic dye microcapsules were produced by in situ polymerization using urea-formaldehyde prepolymer. The average diameter of the microcapsule was 2.94$\mu$m. The dyeability and washing fastness of the photochromic microcapsule fibers were increased by the pretreatment of cationic agent.

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Screening of New Mediators for Lignin Degradation Based on Their Electrochemical Properties and Interactions with Fungal Laccase

  • Shin, Woon-Sup;Cho, Hee-Yeon;Cho, Nam-Seok
    • 펄프종이기술
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    • 제38권5호
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    • pp.1-8
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    • 2006
  • This study was performed to evaluate extensive electrochemical characteristics of 23 commercially available mediators for laccase. Electrochemical properties, interactions with laccases, and ability to degrade lignin were compared for selected mediators. Among them, NNDS has very similar electrochemical properties in terms of reversibility and redox potential (about 470 mV vs. Ag/AgCl at pH=7) compared to ABTS which is a well-known mediator. Specific activity of purified laccase from Cerrena unicolor was determined by both 2,2'-azino-bis-(3-ethylbenz-thiazoline-6-sulfonic acid) (ABTS) and 1-nitroso-2-naphthol -3,6-disulfonic acid (NNDS). The specific activity of the laccase was 23.2 units/mg with ABTS and 21.2 units/mg with NNDS. The electron exchange rate for NNDS with laccase was very similar to that for ABTS, which meant that NNDS had similar mediating capability to ABTS. Determining methanol concentration after reacting with laccase compared to lignin degradation capabilities of both ARTS and NNDS. ARTS or NNDS alone cannot degrade lignin, but in the presence of laccase enhanced the rate of lignin degradation. ABTS showed better activity in the beginning, and the reaction rate of NNDS with lignin was about a half of that of ABTS at 10 minute, but the final concentration of methanol produced in 1 hour was very similar each other. The reason for similar methanol concentration for both ABTS and NNDS can be interpreted as the initial activity of ABTS was better than that of NNDS, but ABTS would be inhibited laccase activity more during the incubation.