Nitrogen oxide gas sensor based on a nitrite-selective electrode

O'Reilly, Stacy A.; Daunert, Sylvia; Bachas, Leonidas G.

doi:10.1021/ac00013a018

Cited by 35 publications

(24 citation statements)

References 23 publications

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“…In the conductometrically inert 1,2-dichloroethane matrix, however, Mn-(TPP)SCN functions satisfactorily; the ideal Nernstian response was observed down to 10-5 M of thiocyanate, as shown in Table 4. The difference in the emf response of Mn(TPP)SCN between the two types of membrane matrices implies that the anion-responsive function of the present anion carrier is more susceptible to the undesirable side effects of anionic impurities in the membrane matrices than are other related anion carriers.4, [17][18][19] In the effect of pH on potentials, a much more distinct difference can be seen between the two types of the membranes, as compared in Fig. 2.…”

Section: Conductivities Of Liquid Membranesmentioning

confidence: 94%

Effect of Membrane Matrices on Performances of a Thiocyanate Ion-Selective Electrode Based on the (5,10,15,20-Tetraphenyl-porphyrinato)manganese(III) Anion Carrier

Jyo

Egawa

1992

ANAL. SCI.

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Conductivities and emf responses of plasticized poly(vinyl chloride) (PVC) and 1,2-dichloroethane membranes containing thiocyanato (5,10,15,20-tetraphenylporphyrinato)manganese (III) (Mn(TPP)SCN) were studied. The specific conductivities of these two types of membranes were much lower than those of the corresponding membranes containing an anion exchanger, Capriquat. However, a clear difference can be seen in the contribution of the membrane matrices to the overall conductivities between the two types of membranes containing Mn(TPP)SCN; the plasticized PVC matrix greatly contributes to the overall conductivities, whereas the liquid membrane matrix contributes little. In the emf response, Mn(TPP)SCN in the conductometrically inert liquid membrane matrix ideally responds to thiocyanate, whereas it is not able to function ideally in the conductometrically active plasticized PVC matrix. As a possible mechanism for the non-ideal emf response of Mn(TPP)SCN in the plasticized PVC matrix, the failure in co-ion repulsion, which is induced by negatively charged impurities in PVC, is proposed. In a previous paper, Hodinar and one of the present authors (A.J.) have pointed out that an anomalous pHeffect is observed in the response of a nitrite-sensitive electrode based on plasticized PVC membranes containing nitrite salt of cobalt(III) complex of 5,10,15,20-tetraphenylporphyrin (TPP).1 Recently, several authors have reported that metalloporphyrin-based plasticized poly(vinyl chloride) (PVC) membranes respond to pH after soaking them in alkaline solutions. Most authors have concluded that this characteristic pHresponse should be ascribed to the coordination of hydroxide to metal centers of metalloporphyrins or to hydrolysis of water molecules coordinated to the metal centers.2-4 However, Li and Harrison have pointed out that this pH-response is more complex and can not be explained only by theories of membrane selectivity.5As clarified in extensive studies on the response mechanism of neutral carrier-based solvent polymeric cation-selective electrodes, plasticized PVC matrices themselves are not conductometrically and potentiometrically inert.6-10 In this connection, Masadome et al.11,12 have developed ionic surfactant-sensitive electrodes based on plasticized PVC membranes to which no ion sensing material was added, and Sugimoto et al. have reported the PVC membranes plasticized with onitrophenyl octyl ether (NPOE) respond to pH (or pOH).13 Furthermore, van den Berg et al.14 have clarified the nature of anionic sites in plasticized PVC membranes by means of instrumental analyses, such as secondary ion mass spectrometry and X-ray photoelectron spectroscopy; as the fixed or mobile anionic sites, sulfonate, sulfate and carboxylate groups were identified. 14 As described in a later section, anion carriers such as metalloporphyrins can not give high conductivities comparable to those of usual anion exchangers since the strong binding of the anion carriers with anions results in electrically neutral species. Thus, it is predict...

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Section: Conductivities Of Liquid Membranesmentioning

confidence: 94%

Effect of Membrane Matrices on Performances of a Thiocyanate Ion-Selective Electrode Based on the (5,10,15,20-Tetraphenyl-porphyrinato)manganese(III) Anion Carrier

Jyo

Egawa

1992

ANAL. SCI.

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“…Similar results were obtained in a study of anion-selective electrodes based on other metal complexes. 24,25 At pH < 2.0, the deviations from the linear response for the concentration of iodide were due to oxidation of the iodide ion to iodine in a low-pH aqueous solution. 26 …”

Section: Effect Of Ph On the Response Characteristics Of The Electrodementioning

confidence: 99%

Highly Selective Iodide Electrode Based on the Copper(II)-N,N′-bis(salicylidene)-1,2-bis(p-aminophenoxy)ethane Tetradentate Complex

Yuan

et al. 2006

ANAL. SCI.

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Anion-selective membrane electrodes doped with ammonium or phosphonium salts and metal compounds with charge usually display the so-called Hofmeister selectivity sequence: ClO4 -> SCN -> I -> NO3 -> Br -> NO2 -> Cl ->SO4 2-. 1,2 Thus research on anti-Hofmeister sensing materials for anions is a challenging domain in chemical sensors. The derivatives of vitamin B12, metalloporphyrins, metallo-phthalocyanines and Schiff-base metallic complexes have been used as sensing materials for anion-selective electrodes in previous research.3-11 These electrodes possessed a preferential potentiometric response towards some specific anions, such as salicylate, thiocyanate, iodide, and nitrite in an anti-Hofmeister sequence. These differences showed that the potentiometric response of the electrodes was closely related to a direct interaction between the central metal and a specific ion as well as the steric effect associated with the structure of the complexes.Iodine is greatly present in the environment, medicine and food samples, and also is an indispensable microelement to humans. Thus, the determination of iodide ion of actual samples is very important. Although a solid-state electrode based on a pressed mixture of AgI/Ag2S has been commercially used to determine I -, the quality and characteristics of the electrode are strongly influenced by many factors, such as high purity of sulfides, mechanical properties, pressure, and temperature used in making pellets.12 At present, several PVCbased liquid membrane iodide-selective electrodes based on a variety of sensing materials, especially complexes of cobalt(II) and mercury(II), have been reported in the literature. [13][14][15][16][17][18] However, cobalt(II) complexes are less stable and mercury(II) complexes are toxic. Moreover, most of the electrodes have some problems, such as low selectivity, narrow linear range, and high detection limit. It is therefore important to search for sensing materials of the iodide-selective electrode with excellent performance. In this work, a copper(II) complex of N,N′-bis(salicylidene)-1,2-bis(p-aminophenoxy)ethane (Cu(II)BBAP) ( Fig. 1) with high stability and nontoxicity was synthesized and used to prepare a PVC-based liquid-membrane electrode. Our researches found that this electrode displayed excellent potentiometric response characteristics toward iodide, such as a wide linear range, low detection, fast response and good stability. The response mechanism of the electrode was investigated in view of the A.C. impedance and UV/Vis spectroscopy technique. The Cu(II)BBAP-based electrode was preliminarily applied to the determination of iodide in some medicines, such as iophendylatum. Experimental Methods and apparatusPotentiometric measurements were made with a Model PHS-4C lonalyzer (Chengdu Science Co., Chengdu, China) and a

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“…Electrodes based on porphyrin and vitamin B12 derivatives, reported previously, also showed a similar effect of OH -on the potentiometric response. 16 BNSDM, and the selectivity coefficients were compared with that of an electrode containing a quaternary ammonium salt, hexadecyltrioctylammonium iodide (HTOAI) 19 and an electrode based on bis-bebzoin-semitriethylenetetraamine binuclear copper(II) (Cu(II)2-BBSTA) 10 and metal(III) porphyrin ionophores 20 (see Table 2). From the table, we can see that the electrode containing Cu(II)-BNSDM showed a higher selectivity than that mentioned in the literature and displayed an anti-Hofmeister selectivity sequence: thiocyanate > perchlorate > iodide > salicylate > bromide > nitrite > chloride > nitrate > phosphate > sulfate.…”

Section: Potentiometric Response Characteristics Of Electrodesmentioning

confidence: 99%

Highly Selective Thiocyanate Electrode Based on Bis-[N-(2-hydroxyethyl)salicylaldimino]copper(II) Complex as a Neutral Carrier

Huang¹,

Chai²,

Yuan³

et al. 2004

ANAL. SCI.

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Nitrogen oxide gas sensor based on a nitrite-selective electrode

Cited by 35 publications

References 23 publications

Effect of Membrane Matrices on Performances of a Thiocyanate Ion-Selective Electrode Based on the (5,10,15,20-Tetraphenyl-porphyrinato)manganese(III) Anion Carrier

Effect of Membrane Matrices on Performances of a Thiocyanate Ion-Selective Electrode Based on the (5,10,15,20-Tetraphenyl-porphyrinato)manganese(III) Anion Carrier

Highly Selective Iodide Electrode Based on the Copper(II)-N,N′-bis(salicylidene)-1,2-bis(p-aminophenoxy)ethane Tetradentate Complex

Highly Selective Thiocyanate Electrode Based on Bis-[N-(2-hydroxyethyl)salicylaldimino]copper(II) Complex as a Neutral Carrier

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