Detection Limits of Ion-Selective Electrodes

Midgley, Derek

doi:10.1016/b978-0-08-029692-0.50005-9

Cited by 35 publications

(21 citation statements)

References 161 publications

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“…The wide uses of ISEs in routine chemical analysis have been accompanied by a search for ionophores that can chemically recognize specific ions and offer either new or improved selectivities for different ions. In the literature, the membranes used in anion selective sensors are based on quaternary ammonium or phosphonium salts [5][6][7][8]. In the case of most anion-selective electrodes, there are relatively few examples of the use of ionophores.…”

Section: Resultsmentioning

confidence: 99%

“…Among different anions, the recognition of strongly hydrophilic anions such as SO 4 2− by potentiometric methods has shown to be quite difficult [1][2][3][4]. Thus, despite the urgent need for selective potentiometric determination of minute amounts sulfate ion in many chemicals, pharmaceutical, environmental and industrial samples, only a few reports on the preparation of SO 4 2− ion-selective electrodes are available in the literature [5][6][7][8][9]. None of the solid state sulfate ionselective electrodes has reported to be satisfactory, due to the lack of adequate selectivities [4].Recently, new sulfate ion-selective electrodes based on a bisthiourea ionophore [6], a derivative of imidazole [7] and a zwitterionic bisguanidinium ionophore as a sulfate carrier [8] [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Novel and Quick Sensor Respective for Sulfate

Mahmoud

Aly

Hamza

2006

Al-Azhar Bulletin of Science

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A sulfate-selective PVC-membrane sensor based on nickel complex of 3, 8-dimethyl 5, 6benzo-4, 7-diazadece-3, 7-diene-2, 9-dione (dioxime) as (a novel sensing material) is presented. The Potentiometric behavior of the sensor was independent on the pH of the solution between 4.5 and 7.5 pH. The sensor revealed a linear response towards SO 4 2− ion in the range of 5.0×10 −7 to 1.0×10 −2 M with an anionic slope of-30±0.2 mV per decade. The sensor possesses a satisfactory reproducibility, fast response time, low limit of detection (3×10 −7 M). The interference of hydrophobic inorganic anions was very low in comparison with the conventional ion-exchanger based electrodes, as shown by the selectivity coefficients determined by the separate solution method (SSM). The selectivity was also good towards the most common univalent and divalent anions. The sensor was used as an indicator electrode in potentiometric titration of sulfate with barium ions and in determination of sulfate in some pharmaceutical products .

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel and Quick Sensor Respective for Sulfate

Mahmoud

Aly

Hamza

2006

Al-Azhar Bulletin of Science

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“…Then the linearity of the electrode response was further controlled by an internal calibration, introducing an additional amount of NaF in the reaction mixture. To be noted is that all our experiments have been carried out at pH consistent with a simple thermodynamic behavior of the¯uoride electrode (pH < 10) [13,15,16].…”

Section: Potentiometric Measurementsmentioning

confidence: 99%

Use of a Fluoride Ion Selective Electrode as a Tool for Monitoring Relatively Fast Kinetic Processes. Applications to the Hydrolysis of Organofluorophosphorus Esters and 2,4-Dinitrofluorobenzene

et al. 2000

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Experimental conditions have been designed which allowed the use of a fluoride ion selective electrode for the monitoring of reactions that proceed with a moderately fast departure of F– ion, i.e., t1/2≈30 seconds, in aqueous solution. The procedure applied in particular to the SNAR substitution of 1‐fluoro‐2,4‐dinitrobenzene with p‐chlorophenoxide ion and to the hydrolysis, catalyzed by oximate ions, of three organofluorophosphorus esters, namely sarin, soman and diisopropylphosphorofluoridate (DFP). Depending upon the system at hand, the required buffering of the solutions can be made up from the nucleophile reagent itself or through the use of an external buffer.

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“…However, because of high hydrophilic characteristic of SO4 2À , construction of suitable ISEs for sulfate ion have been difficult [23 -25]. Most of the reported solid state and ionophore-free ion exchanger sulfate-selective electrodes have not been satisfactory due to lack of adequate selectivities [26]. Only recently, carrierbased sulfate-selective electrode with relatively good selectivity and sensitivity were reported [22, 27 -32].…”

Section: Introductionmentioning

confidence: 99%

Chemically Modified Carbon Paste Electrode for Determination of Sulfate Ion by Potentiometric Method

2006

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Four Schiff base complexes of different metal ions, M ¼ Cr(III), Mn(III), Fe(III), and Co(III), were studied to characterize their ability as sulfate ion carriers in carbon paste electrode (CPE). The modified CPE electrode with Schiff base complex of Cr(III), N,N'-ethylenebis(5-hydroxysalicylideneiminato) chromium(III) Chloride, showed good response characteristics to SO 4 2À ion. The proposed electrode exhibits a Nernstian slope of 28.9 AE 0.4 mV per decade for SO 4 2À ion over a wide concentration range from 1.5 Â 10 À6 À 4.8 Â 10 À2 M, with a detection limit of 9.0 Â 10 À7 M. The CPE electrode manifested advantages of relatively fast response time, suitable reproducibility and life time and, most important, good potentiometric selectivity relative to a wide variety of other common inorganic anions. The potentiometric response of the electrode is independent of the pH of the test solution in the pH range 4.0 -9.0. The proposed electrode was used as an indicator electrode in potentiometric titration of sulfate with Ba 2þ ion, the determination of zinc in zinc sulfate tablet and also determination of sulfate content of a mineral water sample.

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Detection Limits of Ion-Selective Electrodes

Cited by 35 publications

References 161 publications

Novel and Quick Sensor Respective for Sulfate

Novel and Quick Sensor Respective for Sulfate

Use of a Fluoride Ion Selective Electrode as a Tool for Monitoring Relatively Fast Kinetic Processes. Applications to the Hydrolysis of Organofluorophosphorus Esters and 2,4-Dinitrofluorobenzene

Chemically Modified Carbon Paste Electrode for Determination of Sulfate Ion by Potentiometric Method

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