Ion-selective electrodes for determination of organic ammonium ions: Ways for selectivity control

Егоров, В. В.; Bolotin, A. A.

doi:10.1016/j.talanta.2006.02.025

Cited by 24 publications

(15 citation statements)

References 16 publications

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“…Much higher k as value for quinine in comparison with dimedrol (both are tertiary amines) can be explained by an additional hydrogen bond formation between hydroxyl-group of quinine and one of the oxygen atoms of TOBS À sulfonic group. The obtained results provide the explanation of wellestablished facts of ion exchangers nature influence on the ISEs selectivity towards the cation of physiologically active amines [47,48].…”

Section: Ion-pairing Of Amine Cations With Anionic Sitessupporting

confidence: 71%

Estimation of Ion‐Pairing Constants in Plasticized Poly(vinyl chloride) Membranes Using Segmented Sandwich Membranes Technique

et al. 2009

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Segmented sandwich membrane method was used to determine ion-pairing constants for four cationic sites: tris-(2,3,4-dodecyloxy)benzenetrimethylammonium, tris-(2,3,4-dodecyloxy)benzenedimethyloctylammonium, tris-(2,3,4-dodecyloxy)benzenemethyldioctylammonium, and dimethyldioctadecylammonium with chloride, bromide, nitrate, benzene sulfonate, trichloroacetate, thiocyanate, perchlorate and picrate, as well as ion-pairing constants for two anionic sites: tetraphenylborate and tris-(2,3,4-octyloxy)benzenesulfonate with dimedrol, quinine, anapriline, and amantadine cations in poly(vinyl chloride) membranes plasticized with 2-nitrophenyl octyl ether. Ion association constants of anions with quaternary ammonium sites regularly increase from picrate to chloride along with reduction of the anion radius and with improvement of site exchanger center steric accessibility. Ion association constants of amine cations with tris-(2,3,4-octyloxy)benzenesulfonate are several orders higher than those with tetraphenylborate and regularly increase from tertiary amine to primary one.

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Section: Ion-pairing Of Amine Cations With Anionic Sitessupporting

confidence: 71%

Estimation of Ion‐Pairing Constants in Plasticized Poly(vinyl chloride) Membranes Using Segmented Sandwich Membranes Technique

et al. 2009

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“…The nature of the plasticizer influences both dielectric constant of the membrane and the mobility of the ionophore 34, 35. The solvent mediator has a dual function, it acts as liquefying agent, enabling homogeneous solubilization and modifying the distribution constant of the ionophore used.…”

Section: Resultsmentioning

confidence: 99%

“…= 278), DOPh (ε r = 4.8, PTLC = 10.2, M.wt. = 434) in sample electrodes to figure out the plasticizer with the best response 34, 35, 37. Pethidine carbon paste electrode (PD‐CPE) with 2‐NPOE as a solvent mediator produced the best response and DOP was suitable for PD‐CGE, as shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

Determination of pethidine hydrochloride using potentiometric coated graphite and carbon paste electrodes

Shawish

Dalou

Ghalwa

et al. 2011

Drug Testing and Analysis

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A new approach for lowering the detection limit of a pethidine ion-selective electrode is presented. A coated graphite (CGE) and carbon paste (CPE) electrodes for pethidine ions based on pethidine-phosphotungstate (PD-PT) as ion-pair complex are described. The sensors exhibit a Nernstian slope of 58.1 and 54.2 mVdecade(-1) for pethidine ion over a wide concentration range from 2.6 × 10(-7) to 1.0 × 10(-2) M and 2.1 × 10(-6) to 1.0 × 10(-2) M with a detection limit of 1.8 × 10(-7) M and 7.3 × 10(-7) M for pethidine coated graphite (PD-CGE) and pethidine carbon paste electrode (PD-CPE), respectively. These sensors exhibited a fast response time (about 5-8 s) and good stability. The standard electrode potentials, E(o) , were determined at different temperatures and used to calculate the isothermal temperature coefficient (dE(o) /dT) of the PD-CGE and PD-CPE, which was 0.0062 and 0.0071 V/ °C, respectively. Selectivity coefficients, determined by matched potential method (MPM) and separate solution method (SSM), showed high selectivity for pethidine hydrochloride (PDCl) over a large number of inorganic cations, organic cations, sugars, urine components, and some common drug excipients. The sensors were applied for determination of PDCl in ampoule and in spiked urine samples using potentiometric determination, standard addition and the calibration curve methods. The results obtained were satisfactory with excellent percentage recovery comparable and sometimes better than those obtained by other routine methods for the assay.

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“…The electrode plasticized with o-NPOE is compared with those of DBP, DOP, DOS, or TCP. It is found that the highest total potential change (499 mV) and the highest potential break at the end point (390 mV) are obtained using o-NPOE which may be attributed to its high dielectrical constant and the high extractability of the CTA_TPB ion pair compared with other tested plasticizers (e values were 24, 3.88, 5.2, 4.7 and 17.6, for o-NPOE, DOS, DOP, DBP and TCP, respectively) [36,37]. Due to the high extractability of the formed ion pair in the o-NPOE, no electrode preconditioning is needed before applying the electrode in the potentiometric titration and an excellent titration curve can be achieved from the second titration process.…”

Section: Effect Of the Plasticizer Typementioning

confidence: 96%

New Screen‐Printed Ion‐Selective Electrodes for Potentiometric Titration of Cetyltrimethylammonium Bromide in Different Civilic Media

et al. 2010

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The performance of home-made printed carbon ink in the fabrication of a simple screen-printed carbon paste electrodes (SPCPEs) was studied. Such electrodes are applied for the potentiometric titration and hence determination of cetyltrimethylammonium bromide (CTAB) in different pharmaceuticals and water samples. The performances of the new screen printed electrodes towards CTAB are compared with those for carbon paste, coated-wire, coated graphite and polyvinyl chloride electrodes. SPCPEs have been successfully used for the potentiometric titration of CTAB in the analytical grad solutions, with a potential jump amounts to 1050 mV. The effect of plasticizer type, carbon content, binding materials, printing ink formulation, response time and printing process are optimized. The method is applied for pharmaceutical preparations with a percentage recovery of 99.20 % and RSD = 0.45. The electrodes passes a near-Nernstian cationic slope of 58.70 AE 1.3 and 56.32 AE 2.4 mV and lower detection limit of 6.8 10 À7and 5.80 10 À7 M with a reproducibility of 0.145 and 3.25 % and response time of about 3 s and exhibit adequate shelf-life of 6 and 2 months for SPCPE and CPE, respectively. The frequently used CTAB of analytical and technical grade as well as different water samples has been successfully titrated and the results obtained agreed with those obtained with commercial electrode and standard two phase titration method. The sensitivity of the proposed method is comparable with the official method indicating its possibility to be used in field measurements.

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Ion-selective electrodes for determination of organic ammonium ions: Ways for selectivity control

Cited by 24 publications

References 16 publications

Estimation of Ion‐Pairing Constants in Plasticized Poly(vinyl chloride) Membranes Using Segmented Sandwich Membranes Technique

Estimation of Ion‐Pairing Constants in Plasticized Poly(vinyl chloride) Membranes Using Segmented Sandwich Membranes Technique

Determination of pethidine hydrochloride using potentiometric coated graphite and carbon paste electrodes

New Screen‐Printed Ion‐Selective Electrodes for Potentiometric Titration of Cetyltrimethylammonium Bromide in Different Civilic Media

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