Anion-selective electrodes based on electropolymerized porphyrin films

Daunert, Sylvia; Wallace, Shelley.; Florido, Antonio; Bachas, Leonidas G.

doi:10.1021/ac00017a005

Cited by 145 publications

(87 citation statements)

References 24 publications

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“…The high degree of oxalate selectivity exhibited by the electrode, based on N,N'-bis (salicylidene)-2,2-dimethylpropane-1,3-diamine Ni(II) as a carrier, makes it to be potentially useful for monitoring concentration levels of oxalate in water samples. In order to assess the applicability of the membrane electrode, an attempt was made to determine C 2 O 4 2− in several water samples using the standard addition method. The proposed electrode was employed to determine the recovery of oxalate ions of water sample and interfering effect of other anions and the results are given in Tables 5 and 6.…”

Section: Resultsmentioning

confidence: 99%

“…Recently ion selective electrodes, using plasticized polyvinyl chloride (PVC) membranes doped with organometallic species and a metal-ligand complex including organomercury derivatives of vitamin B 12 , Mn(IV), Co(III), Sn(IV), Porphyrine complexes and so on displayed potentiomertic anion-selectivity sequences, which observably deviated from the classical Hofmeister pattern. [4][5][6][7][8][9] Oxalate is one of the important nutrients in the human diet found principally in spinach, beet leaves, etc. Oxalate is primary chelator of calcium ion, so it forms chelates with dietary calcium, thus gives the complex unavailable for adsorption in the body and absorbed oxalate is also precipitated as insoluble salts that accumulate in the renal tissue.…”

Section: Introductionmentioning

confidence: 99%

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A New Selective Membrane Electrode for Oxalate Based on N,N'-Bis(salicylidene)-2,2-dimethylpropane-1,3-diamine Ni(II)

Ardakani

Iranpoor²,

Karimi³

et al. 2008

Bulletin of the Korean Chemical Society

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A new solvent polymeric membrane electrode, based on N,N'-bis(salicylidene)-2,2-dimethylpropane-1,3-diamine Ni(II) as the ionophore, was designed. The oxalate-selective electrode has the dynamic range between 1.0 × 10 −6 M and 1.0 × 10 −1 M with a Nernstian slope of −28.7 ± 1.0 mV per decade. The detection limit was 6.3 × 10 −7 M. The proposed electrode revealed good selectivities for oxalate over a variety of other anions and could be used in a pH range of 2.0-7.8. The electrode can be used for at least two months without any considerable divergence in potential. The designed electrode was applied as an indicator electrode in the potentiometric determination of oxalate in real samples.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Selective Membrane Electrode for Oxalate Based on N,N'-Bis(salicylidene)-2,2-dimethylpropane-1,3-diamine Ni(II)

Ardakani

Iranpoor²,

Karimi³

et al. 2008

Bulletin of the Korean Chemical Society

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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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“…However, the lipophilicity of the anion still plays an important role, and only the simultaneous consideration of both the lipophilicity and interaction of the anion with nickle allows one to explain the selectivity patterns. 34 Table 4 lists the linear range, detection limit, slope, response time and selectivity coefficients of some of other thiocyanateselective electrodes against the proposed thiocyanate-selective electrode for comparative purposes. 25,[35][36][37][38] As can be seen from the table, the selectivity coefficients obtained for the proposed electrode are superior to those reported for other SCN --selective electrodes listed in Table 4.…”

Section: Selectivity Of the Electrodementioning

confidence: 99%

Thiocyanate Ion-selective PVC Membrane Electrode Based on N,N′-Ethylene-bis(4-methylsalicylidineiminato)nickel(II)

et al. 2006

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Experimental ReagentsReagent-grade high relative molecular weight PVC, trioctylmethyl ammonium chloride (TOMAC) and dioctyl phthalate (DOP) were used as received from Aldrich. Potassium or sodium salts of all anions, tetrahydrofuran (THF); all other chemicals were of highest purity available from Merck, and were used without further purification, except for THF, N′-ethylene-bis(4-methylsalicylidineiminato)nickel(II) [Ni(EBMSI)] complex as a carrier for a thiocyanate-selective electrode is reported. The influences of the membrane composition, pH and possible interfering anions were investigated based on the response properties of the electrode. The electrode exhibited a good Nernstian slope of -58.9 ± 0.7 mV decade -1 , over a wide pH range of 3.5 -8.5 and a linear range of 1.0 × 10 -6 -1.0 × 10 -1 M for thiocyanate. The detection limit of electrode was 3.1 × 10 -7 M SCN -. The selectivity coefficients determined by a fixed interference method (FIM) indicate that a good discriminating ability towards the SCN -ion compared to other anions. The proposed sensor had a fast response time of about 5 -15 s and could be used for at least 3 months without any considerable divergence in the potential. It was applied as an indicator electrode in the titration of thiocyanate with Ag + and in the potentiometric determination of thiocyanate in saliva and urine samples.

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Anion-selective electrodes based on electropolymerized porphyrin films

Cited by 145 publications

References 24 publications

A New Selective Membrane Electrode for Oxalate Based on N,N'-Bis(salicylidene)-2,2-dimethylpropane-1,3-diamine Ni(II)

A New Selective Membrane Electrode for Oxalate Based on N,N'-Bis(salicylidene)-2,2-dimethylpropane-1,3-diamine Ni(II)

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

Thiocyanate Ion-selective PVC Membrane Electrode Based on N,N′-Ethylene-bis(4-methylsalicylidineiminato)nickel(II)

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