• 제목, 요약, 키워드: ion-selective electrode

검색결과 175건 처리시간 0.051초

싸이크로스포린을 이용한 고분자막 전위차 전극 (Potentiometric performances of polymer membrane electrode based on cyclosporin)

  • 이인숙
    • 분석과학
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    • v.18 no.6
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    • pp.491-494
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    • 2005
  • The main component governing selectivity in ion-selective electrodes and optodes is the ionophore. For this reason, a member of natural products that possess selective ion-binding properties have long been sought after. By applying this principle, the performance of cyclosporin used as neutral carriers for calcium selective polymeric membrane electrode was investigated. The calcium ion-selective electrode based on cyclosporin gave a good Nernstian response of 26.6 mV per decade for calcium ion in the activity range $1{\times}10^{-6}M$ to $1{\times}10^{-2}M$. The optimized calcium ion-selective electrode displayed very comparable selectivity for $Ca^{2+}$ ion against alkali and alkaline earth metal ions, $Na^{2+}$, and $Mg^{2+}$ in particular.

Sodium Ion-Selective Membrane Electrode Based on Dibenzopyridino-18-Crown-6

  • Tavakkoli, Nahid
    • Bulletin of the Korean Chemical Society
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    • v.25 no.10
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    • pp.1474-1476
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    • 2004
  • A sodium ion- selective electrode based on dibenzopyridino-18-crown-6 as membrane carrier was successfully prepared. The electrode exhibits a Nernstian response for $Na^+$ ions within the concentration range of $1.0\;{\times}\;10^{-4}-1.0\;{\times}\;10^{-1}$ M. The response time of the sensor is 20 s. The sodium ion-selective electrode exhibited comparatively good selectivities with respect to alkali, alkaline earth and some transition metal ions.

Development of a New Copper(II) Ion-selective Poly(vinyl chloride) Membrane Electrode Based on 2-Mercaptobenzoxazole

  • Akhond, Morteza;Ghaedi, Mehrorang;Tashkhourian, Javad
    • Bulletin of the Korean Chemical Society
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    • v.26 no.6
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    • pp.882-886
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    • 2005
  • Copper(II) ion-selective PVC membrane electrode based on 2-mercaptobenzoxazole as a new ionophore and o-nitrophenyl octyl ether (o-NPOE) as plasticizer is proposed. This electrode revealed good selectivity for $Cu^{2+}$ over a wide variety of other metal ions. Effects of experimental parameters such as membrane composition, nature and amount of plasticizer, and concentration of internal solution on the potential response of $Cu^{2+}$ sensor were investigated. The electrode exhibits good response for $Cu^{2+}$ in a wide linear range of 5.0 ${\times}$ 10−.6-1.6 ${\times}$ $10^{-2}$ mol/L with a slope of 29.2 ${\pm}$ 2.0 mV/decade. The response time of the sensor is less than 10 s, and the detection limit is 2.0 ${\times}$ $10^{-6}$ mol/L. The electrode response was stable in pH range of 4-6. The lifetime of the electrode was about 2 months. The electrode revealed comparatively good selectivities with respect to many alkali, alkaline earth, and transition metal ions.

대기중 질산화물의 이온 선택성 전극에 의한 처리 (Treatment of Nitrogen Oxides in Ambient Air using a Ion-Selective Electrode)

  • 안형환;우인성;강안수;이영순;김윤선
    • 한국안전학회지
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    • v.5 no.2
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    • pp.40-49
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    • 1990
  • For the determination of polluant NOx in ambient air, nitrate ion-selective electrode(ISE) was made. To comparison of NOx in each method, the nitrate-ISE, NEBA, Orion electrode were used to determinee NOx in ambient air. In this work, the concentration of NOx in ambient air was average 0.06ppm. The results were good agreement with those obtained by each method within a relative error of 3%, Absorbing efficiency of nitrogen oxides in ambient air was good for Alkali solution. The determination of nitrogen oxides in ambient air using the Aliquat 336N-PVC membrane electrode was one of the useful method. The best characteristics of the Aliquat 336N-PVC me,mbrane electrode were obtained with the ion-exchanger concentration level of 6.5-9.1 percent by weight. The optimal membrane composition, was 9.09wt.% of ion-exchanger, 30.95wt.% of PVC, 60.6wt.% of plasticizer (DBP), and 0.5mm of thickness. Under the above condition, the electrode approached the Nernstian slope most closely, and the linear response ranges produced the best results.

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Thallium(Ⅰ)-Selective Membrane Potentiometric Sensor Based on Dibenzyldiaza-18-Crown-6

  • Khayatian, Gholamreza;Shariati, Satar;Salimi, Abdollah
    • Bulletin of the Korean Chemical Society
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    • v.24 no.4
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    • pp.421-425
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    • 2003
  • A new thallium(Ⅰ) selective electrode based on dibenzylidaza-18-crown-6 as mambrane carrier was successfully prpared. The electrode exhibitis a near-Nernstian response for $ T1^+$ ions over a wide concentration range from $1.0×10^{15}-1.0×10^{-1}$M at 25℃, and was found to be selective, precise and useable within the pH range 4.0-11.0. The electrode was successfully used as an indicator electrode in potentiometric titration of thallium ions.

Potentiometric Determination of L-Malate Using Ion-Selective Electrode in Flow Injection Analysis Syste

  • Kwun, In-Sook;Lee, Hye-Sung;Kim, Meera
    • Preventive Nutrition and Food Science
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    • v.4 no.1
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    • pp.79-83
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    • 1999
  • A potentiometric biosensor employing a CO3-2 ion-selective electrode(ISE) and malic enzyme immobilization in al flow injection analysis (FIA) system was constructed. Analytical parameters were optimized for L-malate determination . The CO3-2 -ISE-FIA system was composed of a pump, an injector, a malic enzyme (EC1.1.1.40) reactor, a CO3-2 ion-selective electrode, a pH/mV meter and a recorder. Cofactor NADP was also injected with substrate for theenzyme reaction into the system. Optimized analytical parameters for L-malate determination in the CO3-2 ISE-FIA system were as follows ; flow rate, 14.5ml/hr ; sample injection volume, 100ul; enzyme loading in the reactor, 20 units ; length of the enzyme reactor , 7 cm ; tubing length form the enzyme reactor to the detector as a geometric factor in FIA, 15 cm . The response time for measuring the entire L-malate concentration range (10-2 ~10-5 mol/L ; 4 injections )was <15minutes . In this CO3-2 -ISE-FIA system, the potential differences due to th eformation of CO3-2 by the reaction of malic enzyme on L-malate were correlated to L-malate concentration in the range of 10-2 ~10-5mol/L ; the detection limit was 10-5 mol/L. This potentionmetric CO3-2 ISE--FIA system was found to be useful for L-malate measurement.

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Bakelite A-Ni(II) 착물의 질산이온 선택성 막전극 (Nitrate Ion-Selective Membrane Electrode Based on Complex of Ammonia Modified Bakelite A-Ni(II) Nitrate)

  • 김환기;신두순
    • 대한화학회지
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    • v.31 no.3
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    • pp.271-279
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    • 1987
  • Amine기를 가진 Bakelite A와 Ni(II) 사이의 착물을 이용한 ${NO_3}^-$이온 선택성 막전극을 만들었다. 이 막전극은 $H^+$ 이온 및 2가 3가 음이온에는 감응하지 않으며, 특히 이 막전극의 재현성, 감응시간 및 이온선택성등 전기화학적 성질을 조사하여 다른 실용화된 막전극과 비교 고찰하였으며 분석화학에의 응용을 고찰하였다.

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UO22+ Ion-Selective Membrane Electrode Based on a Naphthol-Derivative Schiff's Base 2,2'-[1,2-Ethandiyl bis(nitriloethylidene)]bis(1-naphthalene)

  • Shamsipur, Mojtaba;Saeidi, Mahboubeh;Yari, Abdullah;Yaganeh-Faal, Ali;Mashhadizadeh, Mohammad Hossein;Azimi, Gholamhasan;Naeimi, Hossein;Sharghi, Hashem
    • Bulletin of the Korean Chemical Society
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    • v.25 no.5
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    • pp.629-633
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    • 2004
  • A new PVC membrane electrode for $UO_2^{2+}$ ion based on 2,2'-[1,2-ethanediyl bis (nitriloethylidene)]bis(1-naphthalene) as a suitable ionophore was prepared. The electrode exhibites a Nernstian response for $UO_2^{2+}$ ion over a wide concentration range ($1.0{\times}10^{-1}-1.0{\times}10^{-7}$M) with a slope of 28.5 ${\pm}$ 0.8 mV/decade. The limit of detection is $7.0{\times}10^{-8}$M. The electrode has a response time of < 20 s and a useful working pH range of 3-4. The proposed membrane sensor shows good discriminating abilities towards $UO_2^{2+}$ ion with regard to several alkali, alkaline earth transition and heavy metal ions. It was successfully used to the recovery of uranyl ion from, tap water and, as an indicator electrode, in potentiometric titration of $UO_2^{2+}$ ion with Piroxycam.