Sol-Gel Encapsulation as Matrix for Potentiometric Nitrite-Selective Membranes Doped with Chloro (5, 10, 15, 20-Tetraphenylporphyrinato) Cobalt (III)
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Organic-inorganic hybrid sol-gel matrices were used as hosts for chloro (5, 10, 15, 20-tetraphenylporphyrinato) cobalt (III) (Co[TPP]Cl), a known ionophore for nitrite. The sol-gel precursor was prepared by the reaction of (3-isocyanopropyl) triethoxysilane with 1,4-butanediol. An appropriate amount of the anion-exchanger, tridodecylmethylammonium chloride (TDMAC) and the plasticizer, tributylphosphate (DBP) were used as membrane additives. On mixing with an acidic catalyst, the sol-state precursors slowly gelled, yielding a membrane in which the active components, Co[TPP]Cl and TDMAC, were encapsulated. The performances of the sol-gel membrane-based electrodes were compared to those of Co[TPP]Cl-based poly(vinyl chloride) (PVC) membrane electrodes. Membranes with a molar ratio of Co[TPP]Cl: TDMAC (1 : 0.1) showed reasonable response slopes toward nitrite. The response slopes were typically 53 mV/ decade between 10−5.4 and 10−1.0 M. Selectivities toward nitrite over hydrophilic and small anions such as chloride were somewhat inferior to those observed with PVC-based membranes, but selectivities over lipophilic anions were quite similar. Reduced asymmetry potentials due to protein adsorption were found to occur with the sol-gel matrix relative to PVC-based films when the sensors were employed as a detector in flow-through configuration.
Abstract
Organic-inorganic hybrid sol-gel matrices were used as hosts for chloro (5, 10, 15, 20-tetraphenylporphyrinato) cobalt (III) (Co[TPP]Cl), a known ionophore for nitrite. The sol-gel precursor was prepared by the reaction of (3-isocyanopropyl) triethoxysilane with 1,4-butanediol. An appropriate amount of the anion-exchanger, tridodecylmethylammonium chloride (TDMAC) and the plasticizer, tributylphosphate (DBP) were used as membrane additives. On mixing with an acidic catalyst, the sol-state precursors slowly gelled, yielding a membrane in which the active components, Co[TPP]Cl and TDMAC, were encapsulated. The performances of the sol-gel membrane-based electrodes were compared to those of Co[TPP]Cl-based poly(vinyl chloride) (PVC) membrane electrodes. Membranes with a molar ratio of Co[TPP]Cl: TDMAC (1 : 0.1) showed reasonable response slopes toward nitrite. The response slopes were typically 53 mV/ decade between 10−5.4 and 10−1.0 M. Selectivities toward nitrite over hydrophilic and small anions such as chloride were somewhat inferior to those observed with PVC-based membranes, but selectivities over lipophilic anions were quite similar. Reduced asymmetry potentials due to protein adsorption were found to occur with the sol-gel matrix relative to PVC-based films when the sensors were employed as a detector in flow-through configuration.
참고문헌 (32)
- D. Ammann, "Anion selectivity of metalloporphyrins in membranes", Helv. Chim. Acta, 69, pp.849~ (1986)
- N. A. Chaniotakis, "Influence of porphyrin structure on anion selectivities of manganese(III) porphyrin based membrane electrodes", Anal. Chem, 60, pp.185~ (1988)
- D. V. Brown, "Mn(III)-porphyrin-based thiocyanate-selective membrane electrodes: Characterization and application in flow injection determination of thiocyanate in saliva", Electroanalysis, 1, pp.477~ (1989)
- N. A. Chaniotakis, "Salicylate-selective membrane electrode based on tin(IV)-tetraphenylporphyrin", Anal. Chem, 61, pp.566~ (1989)
- C. E. Kibbey, "Further studies on the potentiometric salicylate response of polymeric membranes doped with tin(IV)-tetraphenylporphyrins", J. Electroanal. Chem, 335, pp.135~ (1992)
- S. B. Park, "Potentiometric anion selectivities of polymer membranes doped with indium(III)-porphyrins", Electroanalysis, 3, pp.909~ (1991)
- M. Huser, "Transport Properties of anion-selective membranes based on cobyrinates and metalloporphyrin complexes as ionophores", Helv. Chim. Acta, 73, pp.1481~ (1990)
- E. Bakker, "Anion-selective membrane electrodes based on metalloporphyrins: The influence of lipophilic anionic and cationic sites on potentiometric selectivity", Talanta, 41, pp.881~ (1994)
- E. Malinowska, "Potentiometric and spectroscopic characterization of anion selective electrodes based on metal(III) porphyrin ionophores in polyurethane membranes", Anal. Chim. Acta, 432, pp.67~ (2001)
- E. Malinowska, "This article is not included in your organization's subscription.However, you may be able to access this article under your organization's agreement with Elsevier. Zr(IV)-porphyrins as novel ionophores for fluoride-selective polymeric membrane electrodes", Anal. Chim. Acta, 468, pp.133~ (2002)
- E. D. Steinle, "Origin of non-Nernstian anion response slopes of metalloporphyrin-based liquid", polymer membrane electrodes, 2000, pp.72, 5766~
- S. Oka, "Direct potentiometric determination of chloride ion in whole blood", Anal.Chem, 53, pp.588~ (1981)
- C. J. Brinker, "Sol-Gel Science" (1990), Academic Press
- F. L. Dickert, "Bioimprinting of polymers and solgel phases. selective detection of yeasts with imprinted polymers", Anal. Chem, 74, pp.1302~ (2002)
- Y. Tang, "Solgelderived sensor materials that yield linear calibration plots,high sensitivity, and long-term stability", Anal. Chem, 75, pp.2407~ (2003)
- K. Kimura, "Solgel modification of pH electrode glass membranes for sensing anions and metal ions", Anal.Chem, 73, pp.1605~ (2001)
- W. Kim, "Solgel method for the matrix of chlorideselective membranes doped with tridodecylmethylammonium chloride", Anal. Chem, 69, pp.95~ (1997)
- W. Kim, "Chloride-selective membranes prepared with different matrices including polymers obtained by the sol-gel method", Analyst, 123, pp.379~ (1998)
- B. H. Lee, "A lipophilic solgel matrix for the development of a carbonate-selective electrode", Anal. Chem, 76, pp.6150~ (2004)
- W. Lizinsky, "Toxicity of N-nitroso compounds" (1992), Cambridge University Press
- R. W. Boubel, "Fundamentals of Air Pollution" (1994), Academic Press
- J. A. Dean, "Analytical Chemistry Handbook" (1995), McGrawHill
- I. H. A. Badr, "Nitrite-selective optical sensors based on organopalladium ionophores", Analytical Letters, 34, pp.2019~ (2001)
- S. S. Eaton, "Rotation of phenyl rings in metal complexes of substituted tetraphenylporphyrins", J.Am. Chem. Soc, 97, pp.3660~ (1975)
- U. Wuthier, "Tin organic compounds as neutral carriers for anion selective electrodes", Anal. Chem, 56, pp.535~ (1984)
- E. Bakker, "Selectivity of potentiometric ion sensors", Anal. Chem, 72, pp.1127~ (2000)
- M. Trojanowicz, "Potentiometric pH detection in suppressed ion chromatography", Anal.Chem, 61, pp.787~ (1989)
- A. C. Pierre, "Introduction to sol-gel processing", pp.57~66 (1998), Kluwer Academic Publishers
- K. Kamiya, "Nitrogen-containing SiO2 glass fibers prepared by ammonolysis of gels made from silicon alkoxides", J. of Non-Cryst. Solids, 83, pp.208~ (1986)
- Y. A. Attia, "Sol-gel processing and applications", pp.3~16 (1994), Plenum Press
- S. S. Kistler, "Coherent Expanded Aerogels and Jellies", Nature, 127, pp.741~ (1931)
- V. C. Menon, "Synthesis of hydrophilic and hydrophobic high surface area xerogels at pHs below silica isoelectric point", J. of Sol-Gel Sci. and Tech, 11, pp.7~ (1988)