scholarly journals Cerium(III)-Selective Membrane Electrode Based on Dibenzo-24-crown-8 as a Neutral Carrier

2010 ◽  
Vol 7 (3) ◽  
pp. 849-855 ◽  
Author(s):  
Susheel K. Mittal ◽  
S. K. Ashok Kumar ◽  
Harish K. Sharma
Keyword(s):  
Aqueous Media ◽  
Earth Metal ◽  
Oxalic Acid Solution ◽  
Solution Concentration ◽  
Ion Concentration ◽  
Indicator Electrode ◽  
Average Lifetime ◽  
Membrane Electrode ◽  
Electroactive Material ◽  
Selective Membrane

Cerium(III)-selective membrane electrodes have been prepared using dibenzo-24-crown-8 (DB24C8) as an electroactive material. A membrane having a composition: DB24C8 (4.5%), plasticizer (NPOE, 62.5%) and PVC (33%) gives the best performance. It works well over a wide Ce(III) ion-concentration range of 1x10-5M to 1x10-1M with a Nernstian slope of 19.0 mV/decade and a detection limit of 3x10-5M. It has a fast response time of 20 seconds and has an average lifetime of four months. The internal solution concentration does not have a significant effect on the response of the electrode except for a change in intercept of the calibration curves. The working pH range for Ce(III) solutions (1x10-2M and 1x10-3M) is 3.5-8.0. The proposed sensor shows a good selectivity for cerium(III) with respect to alkali, alkaline earth, some transition and rare earth metal ions that are normally present along with cerium in its ores. The proposed sensor was investigated in partially non-aqueous media using acetone, methanol and DMSO mixtures with water. The electrode was further used as an indicator electrode for the potentiometric titration of Ce(III) solution against oxalic acid solution.

scholarly journals Synthesis and Characterization of Organic-Inorganic Nanocomposite Poly-o-anisidine Sn(IV) Arsenophosphate: Its Analytical Applications as Pb(II) Ion-Selective Membrane Electrode

2009 ◽  
Vol 2009 ◽  
pp. 1-10 ◽  
Author(s):  
Asif Ali Khan ◽  
Umme Habiba ◽  
Anish Khan
Keyword(s):  
Environmental Pollutant ◽  
Exchange Capacity ◽  
Indicator Electrode ◽  
Membrane Electrode ◽  
Mixed Solution ◽  
Electroactive Material ◽  
Wide Ph Range ◽  
Selective Membrane ◽  
Distribution Studies ◽  
Ph Range

Poly-o-anisidine Sn(IV) arsenophosphate is a newly synthesized nanocomposite material and has been characterized on the basis of its chemical composition, ion exchange capacity, TGA-DTA, FTIR, X-RAY, SEM, and TEM studies. On the basis of distribution studies, the exchanger was found to be highly selective for lead that is an environmental pollutant. For the detection of lead in water a heterogeneous precipitate based ion-selective membrane electrode was developed by means of this composite cation exchanger as electroactive material. The membrane electrode is mechanically stable, with a quick response time, and can be operated over a wide pH range. The selectivity coefficients were determined by mixed solution method and revealed that the electrode is sensitive for Pb(II) in presence of interfering cations. The practical utility of this membrane electrode has been established by employing it as an indicator electrode in the potentiometric titration of Pb(II).

scholarly journals Synthesis of a New Calix[4]Arene and Its Application in Construction of a Highly Selective Silver Ion-Selective Membrane Electrode

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Saeed Taghvaei-Ganjali ◽  
Reza Zadmard ◽  
Masoumeh Zeyaei ◽  
Kabeh Rahnama ◽  
Farnoush Faridbod ◽  
...  
Keyword(s):  
Response Time ◽  
Potentiometric Titration ◽  
Fast Response ◽  
Pvc Membrane ◽  
Indicator Electrode ◽  
Membrane Electrode ◽  
Membrane Sensor ◽  
Selective Membrane ◽  
Ph Range ◽  
Pvc Membrane Sensor

A PVC membrane sensor for Ag (I) ions has been prepared. The membrane has 5, 11, 17, 23-tetra-tert-butyl-25-(3-N, N-diethyldithio carbamoylpropoxy)-26,27,28-tris-propoxy calix[4]arene (CAD) as a carrier. It was found that the sensor exhibits a Nernstian response for Ag+ ions over a wide concentration range (10−2–10−6 M). Additionally, it illustrates a fast response time (about 5 seconds), and it can be used for at least 2 months without any considerable divergence in potentials. The nature of the plasticizer, the additive, the concentration of internal solutions in the electrodes, and the composition of the membrane were investigated. Furthermore, the suggested membrane electrode revealed good selectivities for Ag+ over a variety of other metal cations, and it could be used in the pH range of 3.0–7.0. Eventually, it was successfully applied as an indicator electrode for the potentiometric titration of Ag+ ion with NaCl.

scholarly journals Ion-exchange studies on poly-o-anisidine Sn(IV) phosphate nano composite and its application as Cd(II) ion-selective membrane electrode

2010 ◽  
Vol 8 (2) ◽  
pp. 396-408 ◽  
Author(s):  
Asif Khan ◽  
Anish Khan
Keyword(s):  
Ion Exchange ◽  
Fast Response ◽  
Indicator Electrode ◽  
Membrane Electrode ◽  
Physical Parameters ◽  
Self Diffusion ◽  
Separation Of Metal Ions ◽  
Selective Membrane ◽  
Entropy Of Activation ◽  
Distribution Studies

AbstractAn organic-inorganic composite, poly-o-anisidine Sn(IV) phosphate, was chemically synthesized by mixing ortho-anisidine into gels of Sn(IV) phosphate with different mixing volume ratios. Studies on the effect of eluant concentration, elution behavior and separation of metal ions were carried out to understand the ion-exchange capabilities. Due to Cd(II) selective nature of composite, revealed by distribution studies, Cd(II) ion selective membrane electrode was fabricated. The analytical utility of the electrode was established by employing it as an indicator electrode in electrometric titrations having fast response time, 3–5s, and long life span of six months. Some physical parameters like self-diffusion coefficient (D0), activation energy (Ea) and entropy of activation (ΔS0) have been evaluated under conditions favoring a particle diffusion-controlled mechanism by studying ion-exchange kinetics.

Synthesis of Kraton/polyaniline ionomer composite membrane as Cu (II) ion selective membrane electrode

2020 ◽  
Vol 16 ◽  
Author(s):  
Mohd Imran Ahamed ◽  
Nimra Shakeel ◽  
Naushad Anwar ◽  
Lutfullah ◽  
Anish Khan
Keyword(s):  
Ion Exchange ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Electrical Conductance ◽  
Exchange Capacity ◽  
Indicator Electrode ◽  
Membrane Electrode ◽  
Ion Exchange Capacity ◽  
Minimum Concentration ◽  
Selective Membrane

: In this work, we demonstrate the synthesis of Kraton ionomer membrane by solution casting method. Kraton ionomer membrane was coated with polyaniline by in situ oxidative chemical polymerization to get electrical conductance in the membrane. The synthesized composite membrane of Kraton/polyaniline ionomer further characterized by electrochemical studies to check the redox properties of the material. Similarly, the ion exchange capacity and proton conductivity and selectivity of the synthesized membrane was also determined. From the selectivity studies which shows that the membrane was selective for Cu (II) ions. Furthermore, the outcomes of the membrane such as high ion exchange capacity, good proton conductivity, and efficient selectivity, displays the synthesized membrane is efficient for the preparation of ion-selective membrane electrode. The minimum concentration range of Cu (II) ions towards the ion-selective membrane was 1 × 10-1 to 1 × 10-8 M. The electrode revealed a Nernstian slope of 28.15 mV/decade change in concentration of Cu (II) ions. In addition, the electrode exposed fast response time of 10s, working pH range of 3-6.5, detection limit of 1 × 10-9 M and appreciably good selectivity towards Cu (II) ions over alkali, alkaline, and other heavy metal ions. Moreover, it can be employed as indicator electrode for the potentiometric titration of Cu (II) ions by using ethylene diamine tetraacetic acid, disodium salt (EDTA).

scholarly journals Potentiometric Sensor for Gadolinium(III) Ion Based on Zirconium(IV) Tungstophosphate as an Electroactive Material

2009 ◽  
Vol 6 (4) ◽  
pp. 1139-1149 ◽  
Author(s):  
Harish K. Sharma ◽  
Nadeem Sharma
Keyword(s):  
Ion Exchange ◽  
Epoxy Resin ◽  
Aqueous Media ◽  
Earth Metal ◽  
Potential Method ◽  
Selectivity Coefficient ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Electroactive Material ◽  
Wide Range

A new inorganic ion exchanger has been synthesized namely Zirconium(IV) tungstophosphate [ZrWP]. The synthesized exchanger was characterized using ion exchange capacity and distribution coefficient (Kd). For further studies, exchanger with 0.35 meq/g ion-exchange capacity was selected. Electrochemical studies were carried out on the ion exchange membranes using epoxy resin as a binder. In case of ZrWP, the membrane having the composition; Zirconium(IV) tugstophosphate (40%) and epoxy resin (60%) exhibits best performance. The membrane works well over a wide range of concentration from 1×10-5to 1×10-1M of Gd(III) ion with an over- Nernstian slope of 30 mv/ decade. The response time of the sensor is 15 seconds. For this membrane, effect of internal solution has been studied and the electrode was successfully used in partially non-aqueous media too. Fixed interference method and matched potential method has been used for determining selectivity coefficient with respect to alkali, alkaline earth, some transition and rare earth metal ions that are normally present along with Gd(III) in its ores. The electrode can be used in the pH range 4.0-10.0 for 10-1M and 3.0-7.0 for 10-2M concentration of target ion. These sensors have been used as indicator electrodes in the potentiometric titration of Gd(III) ion against EDTA and oxalic acid.

A polyvinylchloride-based cadmium ion-selective electrode using [Mo2(OAc)2(H2-calix[4]arene)] as an electroactive material

2010 ◽  
Vol 62 (11) ◽  
pp. 2510-2518 ◽  
Author(s):  
Sonika Tyagi ◽  
Himanshu Agarwal ◽  
Saiqa Ikram
Keyword(s):  
Ethylenediaminetetraacetic Acid ◽  
Indicator Electrode ◽  
Membrane Electrode ◽  
Electroactive Material ◽  
Direct Potentiometry ◽  
Electrode Sensor ◽  
Sodium Tetraphenyl Borate ◽  
Nernstian Slope ◽  
Tetraphenyl Borate ◽  
Ph Range

A highly electroactive material Mo2[(OAc)2(H2-calix[4]arene)] is used as a neutral carrier for Cd2 +  ions in this paper. The membrane is fabricated by using ionophore [Mo2(OAc)2(H2-calix[4]arene)]:poly(vinyl chloride) (PVC): dibutylphthalate(DBP):sodium tetraphenyl borate (NaTPB) in the ratio of 40:300:470:5 respectively and tetrahydrofuran (THF) used as a solvent. The membrane electrode performed in the concentration range of 9.9 × 10−8–1.0 × 10−1 M (2.34 × 10−5–23.64 mg/mL) having the Nernstian slope of 30.0±1.0 mV and the best detection limit was observed at 9.8 × 10−8 M (2.31 × 10−5 mg/mL). The proposed membrane electrode has the response time of 12 s and a useful working pH range of 1.0–7.0, and used over a period of 10 months and work satisfactorily in the test solution having 30% (v/v) non-aqueous content. Electrode sensor has distinguishable ability for Cd2 +  ion with regard to several alkali, alkaline earth, transition and heavy metal ions. It was used in direct potentiometry as an indicator electrode, in the potentiometric titration of 10−3 M Cd2 +  solution against 10−2 M of ethylenediaminetetraacetic acid (EDTA).

scholarly journals Yttrium (III) Selective Electrode Based On Zirconium (IV) Phosphoborate

2014 ◽  
Vol 17 (1) ◽  
pp. 005-008 ◽  
Author(s):  
Sandeep Kaushal ◽  
Pritpal Singh ◽  
Susheel K. Mittal
Keyword(s):  
Aqueous Medium ◽  
Potentiometric Titration ◽  
Calibration Curve ◽  
Solution Concentration ◽  
Indicator Electrode ◽  
Membrane Electrode ◽  
Selective Electrode ◽  
Internal Solution ◽  
Heterogeneous Membrane ◽  
Ph Range

Zirconium phosphoborate based heterogeneous membrane electrode has been used as a sensor for yttrium ions in aqueous medium. The electrode shows reproducible and Nernstian behavior for yttrium ions in the oncentration range 10-4M to 10-1M with an RSD of 2%. The electrode does not show any change in response within a pH range of 5-9. The effect of internal solution concentration on the calibration curve was also studied. The electrode performance was also studied in partially non-aqueous medium (5% - 20%) of acetone and ethanol. The system was used successfully as an indicator electrode in potentiometric titration of yttrium ions with EDTA.

Novel palladium(II) selective membrane electrode based on 4-[(5-mercapto-1,3,4-thiadiazol-2-ylimino)methyl]benzene-1,3-diol

2010 ◽  
Vol 75 (5) ◽  
pp. 563-575 ◽  
Author(s):  
Moslem Mohammadi ◽  
Mehdi Khodadadian ◽  
Mohammad K. Rofouei
Keyword(s):  
Limit Of Detection ◽  
Membrane Electrode ◽  
Aqueous Samples ◽  
Selective Determination ◽  
Poly Vinyl Chloride ◽  
Selective Membrane ◽  
Ph Range ◽  
Palladium Content ◽  
Methyl Benzene

A plasticized poly(vinyl chloride) membrane electrode based on 4-[(5-mercapto-1,3,4-thiadiazol-2-ylimino)methyl]benzene-1,3-diol (L) for highly selective determination of palladium(II) (in PdCl42– form) is developed. The electrode showed a good Nernstian response (29.6 ± 0.4 mV per decade) over a wide concentration range (3.1 × 10–7 to 1.0 × 10–2 mol l–1). The limit of detection was 1.5 × 10–7 mol l–1. The electrode has a response time of about 20 s, and it can be used for at least 2 months without observing any considerable deviation from Nernstian response. The proposed electrode could be used in the pH range of 2.5–5.5. The practical utility of the electrode has been demonstrated by its use for the estimation of palladium content in aqueous samples.

scholarly journals Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous Media

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 224
Author(s):  
Yi Zhou ◽  
Yang Yang ◽  
Changxing Zhu ◽  
Mingyuan Yang ◽  
Yi Hu
Keyword(s):  
Numerical Analysis ◽  
Aqueous Media ◽  
Concentration Field ◽  
Ion Concentration ◽  
Spherical Particles ◽  
Hydrodynamic Effect ◽  
Oblate Spheroids ◽  
Thermodiffusion Coefficient ◽  
Arbitrary Electric Double Layer ◽  
Dimension Ratio

Thermophoresis of charged colloids in aqueous media has wide applications in biology. Most existing studies of thermophoresis focused on spherical particles, but biological compounds are usually non-spherical. The present paper reports a numerical analysis of the thermophoresis of a charged spheroidal colloid in aqueous media. The model accounts for the strongly coupled temperature field, the flow field, the electric potential field, and the ion concentration field. Numerical simulations revealed that prolate spheroids move faster than spherical particles, and oblate spheroids move slower than spherical particles. For the arbitrary electric double layer (EDL) thickness, the thermodiffusion coefficient of prolate (oblate) spheroids increases (decreases) with the increasing particle’s dimension ratio between the major and minor semiaxes. For the extremely thin EDL case, the hydrodynamic effect is significant, and the thermodiffusion coefficient for prolate (oblate) spheroids converges to a fixed value with the increasing particle’s dimension ratio. For the extremely thick EDL case, the particle curvature’s effect also becomes important, and the increasing (decreasing) rate of thermodiffusion coefficient for prolate (oblate) spheroids is reduced slightly.

scholarly journals Thermodynamic Study on the Dissociation and Complexation of Coumarinic Acid with Neodymium(III) and Dioxouranium(VI) in Aqueous Media

2021 ◽  
Vol 11 (10) ◽  
pp. 4475
Author(s):  
Luana Malacaria ◽  
Giuseppina Anna Corrente ◽  
Emilia Furia
Keyword(s):  
Protonation Constant ◽  
Aqueous Media ◽  
Metal Cations ◽  
Natural Antioxidants ◽  
Ion Concentration ◽  
Basic Salt ◽  
Hydrogen Ion Concentration ◽  
Overall Stability ◽  
Titration Data ◽  
Metal Ratio

In the frame of a systematic study on the sequestering ability of natural antioxidants towards metal cations, the complexation of coumarin-3-carboxilic acid (HCCA) with neodymium(III) and dioxouranium(VI) (uranyl, UO22+), and overall stability constants of the resulting complexes, were evaluated from the pH-potentiometric titration data at 37 °C and in an aqueous solution (i.e., 0.16 mol/L NaClO4). The graphic representation of the complex’s concentration curves is given by the distribution diagrams, which provide a depiction of all the species present in the solution in the selected pH ranges. The protonation constant of HCCA was also determined to evaluate the competition of the ligand for the metal cations and H+. The ligand-to-metal concentration ratio was varied between 1 and 10, and the hydrogen ion concentration was decreased stepwise until the incipient precipitation of a basic salt of the metal, which occurred at different values depending on the specific metal cation and the ligand to metal ratio. Speciation profiles obtained by potentiometric titrations and supported by UV-Vis data show that a complexation occurs at a ligand-to-Nd(III) and to –UO22+ ratio of 1:1 and 2:1, with different degrees of deprotonation: Nd(OH)(CCA)+, UO2(OH)(CCA), UO2(OH)2(CCA)−, and Nd(OH)(CCA)2, UO2(CCA)2 and (UO2)2(OH)2(CCA)2.

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