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Journal articles on the topic 'Ion selective potentiometry'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Pleniceany, Maria, Marian Isvoranu, and Cezar Spinu. "Liquid membrane ion-selective electrodes for potentiometric dosage of coper and nickel." Journal of the Serbian Chemical Society 70, no. 2 (2005): 269–76. http://dx.doi.org/10.2298/jsc0502269p.

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This paper presents experimental and theoretical data regarding the preparation and characterization of three liquid-membrane electrodes, which have not been mentioned in the specialized literature so far. The active substances, the solutions of which in nitrobenzene formed the membranes on a graphite rod, are simple complex combinations of Cu(II) and Ni(II) ions with an organic ligand belonging to the Schiff base class: N-[2-thienylmethilidene]-2-aminoethanol (TNAHE). The Cu2+ -selective and Ni2+ -selective electrodes were used to determine the copper and nickel ions in aqueous solutions, both by direct potentiometry and by potentiometric titration with EDTA. They were also used for the determination of Cu2+ and Ni2+ ions in industrial waters by direct potentiometry.

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2

Yao, Yao, Yibin Ying, and Jianfeng Ping. "Development of a Graphene Paper-Based Flexible Solid-Contact Lead Ion-Selective Electrode and its Application in Water." Transactions of the ASABE 62, no. 2 (2019): 245–52. http://dx.doi.org/10.13031/trans.12906.

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Abstract. A graphene paper-based flexible solid-contact ion-selective electrode (SC-ISE) was developed to detect lead ion sensitively. Graphene paper obtained via a simple vacuum filtration method was used as the electrode substrate for direct coating of an ion-selective membrane. The Nernstian slope of the prepared paper-based potentiometric sensor toward lead ion detection was demonstrated as 29.4 mV per decade. A detection limit as low as 2.5 × 10-7 mol L-1 was achieved. Reversed chronopotentiometry and water layer test revealed that the graphene paper-based SC-ISE possessed excellent potential stability because of the hydrophobicity of graphene paper. Furthermore, reliable data were obtained from the detection of lead ion levels in real water samples using the graphene paper-based potentiometric sensor, which shows great potential in practical application. Keywords: Graphene paper, Heavy metal, Ion-selective electrode, Potentiometry, Water sample.

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3

Isvoranu, Marian, Constantin Luca, Maria Pleniceanu, and Cezar Spinu. "Studies on a Pb2+ - selective electrode with a macrocyclic liquid membrane: Potentiometric determination of pb2+ ions." Journal of the Serbian Chemical Society 71, no. 12 (2006): 1345–52. http://dx.doi.org/10.2298/jsc0612345i.

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This paper presents experimental and theoretical data regarding the design, characterization and analytical applications of a non-expensive, liquid-membrane ion-selective electrode for Pb2+ ions. The membrane is a solution of the active complex formed by Pb2+ ions with dibenzo-18-crown-6-ionophore (DB-[18]-C-6) extracted in propylene carbonate (PC). The successful application of the developed electrode for the determination of Pb2+ ions in aqueos solution samples by direct potentiometry and potentiometric titration is presented. For the presented analytical results, there are insignificant systematic errors between the direct potentiometric method with the developed ion-selective electrode and atomic absorption spectrometry. .

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4

Guagnellini, E., G. Spagliardi, G. Bernardi, and P. Stella. "Reliability of IL Monarch ion-selective electrode module for sodium, potassium, and chloride measurements." Clinical Chemistry 34, no. 4 (April 1, 1988): 746–48. http://dx.doi.org/10.1093/clinchem/34.4.746.

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Abstract We evaluated the IL Monarch random-access centrifugal analyzer for measurement of Na+, K+, and Cl- by an indirect potentiometric method. For different concentrations of control material, the total precision (CV) ranged between 0.82% and 1.14% for the three electrolytes; linearity was acceptable within a range of 103 to 215 mmol/L for Na+, 1.6-15.25 mmol/L for K+, and 80-173 mmol/L for Cl-. Data correlated well with those by flame photometry for Na+ and K+ and with those by coulometry for Cl-, both for various biological materials--sera, urines, dialysis fluids--and commercial control materials from various producers. Stability of the potentiometric signal was acceptable: daily variations were 0.2 mV for Na+, 0.05 mV for K+, and 0.03 mV for Cl-. Accordingly, we conclude that the system supplies reproducible and accurate results while being easy to use and requiring little maintenance. The use of indirect potentiometry offers results consistent with those obtained with traditional methods, and easily interpretable by clinical staff. However, better information about the actual ion activity in the tested sample for certain pathologies such as hyperlipemia and dysproteinemia could be obtained by methods involving direct potentiometry.

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5

De Marco, Roland, Graeme Clarke, and Bobby Pejcic. "Ion-Selective Electrode Potentiometry in Environmental Analysis." Electroanalysis 19, no. 19-20 (October 2007): 1987–2001. http://dx.doi.org/10.1002/elan.200703916.

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6

Yadav, Amar Prasad. "Preparation of Low Cost Solid State Silver Sulfide Based Bromide Selective Electrodes." Journal of Nepal Chemical Society 27 (August 22, 2012): 100–106. http://dx.doi.org/10.3126/jncs.v27i1.6668.

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Preparation and performance of a cost effective silver sulfide based bromide selective membrane is described. A solid contact between membrane and body of the electrode was examined as an ion-selective electrode by determining S2- and Br- ions by direct potentiometry. A linear response to bromide ion from 2 x 10-5 to 10-1 M with a slope of 57.3 mV per decade [Br-] is observed. The membrane has a very short response. It gives excellent results as an indicator electrode for potentiometric titration.DOI: http://dx.doi.org/10.3126/jncs.v27i1.6668 J. Nepal Chem. Soc., Vol. 27, 2011 100-106

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7

DEL TÓRO DÉNIZ, Rubén, Ana María PEÓN ESPINOSA, Hubert DANDIE MARSHALLECK, and Andres BROCAR ESTEVEZ. "Uses of nitrate ion sensitive electrodes." Eclética Química 22 (1997): 205–10. http://dx.doi.org/10.1590/s0100-46701997000100017.

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Some models of ion-selective electrodes (ISE) and other methods have been elaborated, to quantify nitrate levels in environmental samples (water, fruits, vegetables and others), using direct potentiometry

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8

Lima, J. L. F. C., and M. C. B. S. M. Montenegro. "Dopamine Ion-Selective Electrode for Potentiometry in Pharmaceutical Preparations." Mikrochimica Acta 131, no. 3-4 (August 25, 1999): 187–90. http://dx.doi.org/10.1007/pl00010030.

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9

Berto, S., E. Chiavazza, P. Canepa, E. Prenesti, and P. G. Daniele. "Assessing the formation of weak sodium complexes with negatively charged ligands." Physical Chemistry Chemical Physics 18, no. 18 (2016): 13118–25. http://dx.doi.org/10.1039/c6cp00192k.

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The stability of sodium complexes with poly-carboxylic and polyamino-carboxylic acids is investigated with ion-selective electrode-Na⁺ potentiometry, working at strictly constant ionic strength.

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10

Мантров, Геннадий Иванович, Мариана Александровна Феофанова, and Егор Максимович Грачев. "ION-SELECTIVE ELECTRODE FOR DETERMINATION OF METFORMIN IN PHARMACEUTICAL PREPARATIONS." Вестник Тверского государственного университета. Серия: Химия, no. 3(41) (November 10, 2020): 124–29. http://dx.doi.org/10.26456/vtchem2020.3.13.

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Описана конструкция и электроаналитические характеристики ионселективного электрода (ИСЭ) для количественного определения метформина. В качестве электродноактивных соединений в ИСЭ были использованы ионные ассоциаты метформина с фосфорновольфрамовой(ФВК), фосфорномолибденовой(ФМК) и кремний вольфрамовой кислотами (КВК). Проведено потенциометрическое определение метформина в фармацевтических препаратах. The construction and electroanalytical characteristics of ion-selective electrode (ISE) for metformin are described. Ion pair of metformin with heteropolyacids were tested as electroactive materials for ionometric sensor controls. The ISE was used for direct potentiometry of metformin.

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11

Wu, Rangrong. "Simplified computations for standard-addition methods in ion-selective potentiometry." Analytica Chimica Acta 245 (1991): 283–85. http://dx.doi.org/10.1016/s0003-2670(00)80233-0.

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12

Evans, A., and W. Franklin Smyth. "Potentiometry and ion selective electrodes (analytical chemistry by open learning)." Analytica Chimica Acta 222, no. 1 (1989): 399–400. http://dx.doi.org/10.1016/s0003-2670(00)81925-x.

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13

Govindan, R., D. Alamelu, Raju V. Shah, T. V. Vittal Rao, Y. R. Bamankar, A. R. Parab, K. Sasi Bhushan, S. K. Mukerjee, and S. K. Aggarwal. "Determination of lithium by potentiometry using fluoride ion selective electrode." Analytical Methods 2, no. 11 (2010): 1752. http://dx.doi.org/10.1039/c0ay00275e.

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14

Ježková, Jitka, Jarmila Musilová, and Karel Vytřas. "Potentiometry with perchlorate and fluoroborate ion-selective carbon paste electrodes." Electroanalysis 9, no. 18 (December 1997): 1433–36. http://dx.doi.org/10.1002/elan.1140091813.

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15

Ichikawa, Takanori, Takashi Yasui, Kazutake Takada, and Akio Yuchi. "Direct Potentiometry of Polyacrylate with Solid-Membrane Cadmium Ion-Selective Electrode." BUNSEKI KAGAKU 58, no. 8 (2009): 749–52. http://dx.doi.org/10.2116/bunsekikagaku.58.749.

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16

Mahmoud, Wagiha H. "Iron ion-selective electrodes for direct potentiometry and potentiotitrimetry in pharmaceuticals." Analytica Chimica Acta 436, no. 2 (June 2001): 199–206. http://dx.doi.org/10.1016/s0003-2670(01)00892-3.

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17

Kakabadse, G. J., M. S. Al-Aziz, M. R. O. Karim, R. Perry, A. E. Tipping, J. Cabral, and A. P. Carvalho. "Direct Potentiometry of Ethanol in Alcoholic Beverages Using Ion-Selective Electrodes." Journal of the American Society of Brewing Chemists 49, no. 1 (January 1991): 19–22. http://dx.doi.org/10.1094/asbcj-49-0019.

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18

Wei, Chang, Allen J. Bard, Geza Nagy, and Klara Toth. "Scanning Electrochemical Microscopy. 28. Ion-Selective Neutral Carrier-Based Microelectrode Potentiometry." Analytical Chemistry 67, no. 8 (April 1995): 1346–56. http://dx.doi.org/10.1021/ac00104a008.

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19

Sideris, E. E., G. N. Valsami, M. A. Koupparis, and P. E. Macheras. "Studies on the interaction of diflunisal ion with cyclodextrins using ion-selective electrode potentiometry." European Journal of Pharmaceutical Sciences 7, no. 4 (March 1999): 271–78. http://dx.doi.org/10.1016/s0928-0987(98)00035-9.

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20

Lenar, Nikola, Robert Piech, Jan Wyrwa, and Beata Paczosa-Bator. "Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer." Membranes 11, no. 4 (April 4, 2021): 259. http://dx.doi.org/10.3390/membranes11040259.

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This work presents new material for solid-contact layers—hydrous iridium dioxide IrO2·2H2O, characterized by high electrical capacitance value, evaluated using chronopotentiometry (1.22 mF) and electrochemical impedance spectroscopy (1.57 mF). The remarkable electrical parameters of layers resulted in great analytical parameters of IrO2·2H2O-contacted potassium-selective electrodes. Various parameters of ion-selective electrodes were examined in the scope of this work using a potentiometry method including: linear range, repeatability, stability of potentiometric response and sensitivity to varying measurement conditions. The analytical parameters obtained for solid-contact electrodes were compared with the ones obtained for coated disc electrodes to evaluate the influence of the iridium dioxide layer. The linear range of the IrO2·2H2O-contacted K+-selective electrodes covered concentrations of K+ ions from 10−6 to 10−1 M and the potential stability was estimated at 0.097 mV/h. The IrO2·2H2O-contacted electrodes turned out to be insensitive to varying light exposure and changes in the pH values of measured solutions (in the pH range of 2 to 10.5). A water layer test proved that, contrary to the coated disc electrode, the substantial water film is not formed between the ion-selective membrane and iridium dioxide layer.

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21

Arida, Hassan, Mona Ahmed, and Abdallah Ali. "Preparation, Characterization, and Analytical Application of Ramipril Membrane-Based Ion-Selective Electrode." International Journal of Analytical Chemistry 2009 (2009): 1–7. http://dx.doi.org/10.1155/2009/954083.

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The fabrication and electrochemical evaluation of two PVC membrane-based Ion-Selective electrodes responsive for ramipril drug have been proposed. The sensitive membranes were prepared using ramipril-phosphomolibdate and ramipril-tetraphenylborate ion-pair complexes as electroactive sensing materials in plasticized PVC support. The electrodes based on these materials provide near-Nernestian response (sensitivity of53±0.5–54±0.5 mV/concentration decade) covering the concentration range of1.0×10-2–1.0×10-5 molL−1with a detection limit of3.0×10-6–4.0×10-6 molL−1. The suggested electrodes have been successfully used in the determination of ramipril drug in some pharmaceutical formulations using direct potentiometry with average recovery of >96% and mean standard deviation of <3% (n=5).

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22

Farrell, J. R., P. J. Iles, and T. Dimitrakopoulos. "Photocured polymers in ion-selective electrode membranes. Part 5: Photopolymerised sodium sensitive ion-selective electrodes for flow injection potentiometry." Analytica Chimica Acta 334, no. 1-2 (November 1996): 133–37. http://dx.doi.org/10.1016/s0003-2670(96)00340-6.

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23

Farrell, J. R., P. J. Iles, and T. Dimitrakopoulos. "Photocured polymers in ion-selective electrode membranes Part 6: Photopolymerized lithium sensitive ion-selective electrodes for flow injection potentiometry." Analytica Chimica Acta 335, no. 1-2 (December 1996): 111–16. http://dx.doi.org/10.1016/s0003-2670(96)00355-8.

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24

Chumbimuni-Torres, Karin Y., Chongdee Thammakhet, Michal Galik, Percy Calvo-Marzal, Jie Wu, Eric Bakker, Gerd-Uwe Flechsig, and Joseph Wang. "High-Temperature Potentiometry: Modulated Response of Ion-Selective Electrodes During Heat Pulses." Analytical Chemistry 81, no. 24 (December 15, 2009): 10290–94. http://dx.doi.org/10.1021/ac902191h.

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25

Vance, George F., and Frank J. Sikora. "Selectivity and Solubility Analysis Using Ion Selective Potentiometry: A Soil Chemistry Experiment." Journal of Natural Resources and Life Sciences Education 26, no. 2 (September 1997): 119–24. http://dx.doi.org/10.2134/jnrlse.1997.0119.

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26

Cuartero, María, Joaquín A. Ortuño, Mª Soledad García, and Francisco Martínez-Ortiz. "Differential dynamic potentiometry with ion selective electrodes: A tool for drug fingerprinting." Electrochimica Acta 69 (May 2012): 152–59. http://dx.doi.org/10.1016/j.electacta.2012.02.090.

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27

Zuther, Frank, Bernd Ross, and Karl Cammann. "Differential flow-injection potentiometry with double sensitivity using one ion-selective membrane." Analytica Chimica Acta 313, no. 1-2 (September 1995): 83–87. http://dx.doi.org/10.1016/0003-2670(95)00243-s.

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28

Zubenya, Natalia, Natalia Zubenya, Zholt Kormosh, Diana Saribekova, Diana Saribekova, Sergei Sukharev, and Sergei Sukharev. "Potentiometric Membrane Sensors for Levamisole Determination." Mediterranean Journal of Chemistry 6, no. 2 (November 15, 2016): 7–14. http://dx.doi.org/10.13171/mjc61/016111516/kormosh.

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The ion pair (IP) of levamisole with BiI4 - (SbI4 - ) for the levamisole-selective sensor with a PVC membrane containing - ions were developed. Thermal behavior of obtained IP was investigated by differential thermal analysis that would show the thermal stability and the character of the decomposition of the complex. The thermolysis of Lev+BiI4 - IP undergoes three stages that fit a theoretical interpretation. The linearity ranges of levamisole sensors function are 7.9 ×10-6 – 1×10-1 (7.9 ×10-5 – 1×10-1 ) M. The Nernstian slope of 50.6 – 53.4 mV pC−1 and detection limit of 5.0 × 10−5 – 1.5 × 10−4) M. The working range of pH is 2.8 – 6.0. The efficiency of the use of electrodes for levamisole content control in pharmaceutical preparations was shown by direct potentiometry and potentiometric titration methods.

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29

Christopoulos, T. K., and E. P. Diamandis. "8 assay of albumin in serum based on specific ion-bindingand ion-selective electrode (ISE) potentiometry." Clinical Biochemistry 18, no. 3 (June 1985): 202. http://dx.doi.org/10.1016/s0009-9120(85)80118-1.

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30

Wang, Jirong. "Computational algorithms in ion-selective electrode potentiometry by the two standard additions method." Analyst 115, no. 1 (1990): 53. http://dx.doi.org/10.1039/an9901500053.

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31

Simeonov, V., A. Voulgaropoulos, and M. Sofoniou. "Fast screening of the working condition effects in potentiometry with ion-selective electrodes." Fresenius' Zeitschrift für analytische Chemie 329, no. 4 (January 1987): 444–46. http://dx.doi.org/10.1007/bf00480082.

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32

Cheong, Yi Heng, Liya Ge, and Grzegorz Lisak. "Highly reproducible solid contact ion selective electrodes: Emerging opportunities for potentiometry – A review." Analytica Chimica Acta 1162 (June 2021): 338304. http://dx.doi.org/10.1016/j.aca.2021.338304.

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33

Neshkova, M., E. Pancheva, J. Fucsko, G. Nagy, and E. Pungor. "Chemical amplification of the signal in ion-selective potentiometry: indirect determination of Al(III) and U(VI) by steady-state and flow-injection potentiometry using a copper ion-selective electrode." Analytica Chimica Acta 259, no. 1 (April 1992): 149–57. http://dx.doi.org/10.1016/0003-2670(92)85088-n.

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34

Kim, Junghwan, Dae Hee Kim, Jin Cheol Yang, Jae Sang Kim, Ji Ha Lee, and Sung Ho Jung. "Beryllium-Ion-Selective PEDOT Solid Contact Electrode Based on 9,10-Dinitrobenzo-9-Crown-3-Ether." Sensors 20, no. 21 (November 9, 2020): 6375. http://dx.doi.org/10.3390/s20216375.

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A beryllium(II)-ion-selective poly(ethylenedioxythiophene) (PEDOT) solid contact electrode comprising 9,10-dinitrobenzo-9-crown-3-ether was successfully developed. The all-solid-state contact electrode, with an oxygen-containing cation-sensing membrane combined with an electropolymerized PEDOT layer, exhibited the best response characteristics. The performance of the constructed electrode was evaluated and optimized using potentiometry, conductance measurements, constant-current chronopotentiometry, and electrochemical impedance spectroscopy (EIS). Under optimized conditions, which were found for an ion-selective membrane (ISM) composition of 3% ionophore, 30% polyvinylchloride (PVC), 64% o-nitro phenyl octyl ether (o-NPOE), and 3% sodium tetraphenylborate (NaTPB), the fabricated electrode exhibited a good performance over a wide concentration range (10−2.5–10−7.0 M) and a wide pH range of 2.0–9.0, with a Nernstian slope of 29.5 mV/D for the beryllium (II) ion and a detection limit as low as 10−7.0 M. The developed electrode shows good selectivity for the beryllium(II) ion over alkali, alkaline earth, transition, and heavy metal ions.

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35

Zheng, Xiang-Yang, Daisaku Yano, Takashi Yasui, Kazutake Takada, and Akio Yuchi. "Potentiometry of Anionic Polyelectrolytes by Quaternary Ammonium Ion-Selective Electrode with Quaternary Ammonium Ion Added as Probe." Electroanalysis 21, no. 17-18 (September 2009): 2004–9. http://dx.doi.org/10.1002/elan.200904610.

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36

Quiles, R., J. M. Fernández-Romero, E. Fernández, M. D. Luque de Castro, and M. Valcárcel. "Automated enzymatic determination of sodium in serum." Clinical Chemistry 39, no. 3 (March 1, 1993): 500–503. http://dx.doi.org/10.1093/clinchem/39.3.500.

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Abstract An automated method based on the principles of flow-injection analysis is proposed for the enzymatic determination of sodium ion in serum. The method relies on the activation of beta-galactosidase by the analyte. The features of the proposed method include linear range between 1 and 1700 mumol/L, a sampling rate of 50 samples/h, a sample volume of 50 microL, and the absence of interferences from species usually present in serum. The results obtained were consistent with those provided by widely used methods such as those based on flame spectrometry and direct potentiometry with ion-selective electrodes.

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37

Tyagi, Sonika, Himanshu Agarwal, and Saiqa Ikram. "A polyvinylchloride-based cadmium ion-selective electrode using [Mo2(OAc)2(H2-calix[4]arene)] as an electroactive material." Water Science and Technology 62, no. 11 (December 1, 2010): 2510–18. http://dx.doi.org/10.2166/wst.2010.774.

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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).

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38

Sviridov, V. V., O. A. Syzgantseva, A. A. Raeva, N. K. Zaitsev, N. V. Shvedene, and I. V. Pletnev. "Ion-selective electrodes for the determination of ionic liquids in water using direct potentiometry." Moscow University Chemistry Bulletin 62, no. 2 (April 2007): 89–92. http://dx.doi.org/10.3103/s0027131407020071.

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39

Meier, Peter C., and E. Geistlich. "Quantization error with the single- and double-known addition method in ion-selective potentiometry." Analytical Chemistry 57, no. 1 (January 1985): 373–75. http://dx.doi.org/10.1021/ac00279a087.

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40

Malon, Adam, Tamás Vigassy, Eric Bakker, and Ernö Pretsch. "Potentiometry at Trace Levels in Confined Samples: Ion-Selective Electrodes with Subfemtomole Detection Limits." Journal of the American Chemical Society 128, no. 25 (June 2006): 8154–55. http://dx.doi.org/10.1021/ja0625780.

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41

El-Kosasy, Amira M. "Determination of Hydroxyurea in Capsules and Biological Fluids by Ion-Selective Potentiometry and Fluorimetry." Journal of AOAC INTERNATIONAL 86, no. 1 (January 1, 2003): 15–21. http://dx.doi.org/10.1093/jaoac/86.1.15.

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Abstract Two hydroxyurea selective electrodes were investigated with β-cyclodextrin used as ionophore and either tetrakis (p-chlorophenyl) borate (electrode 1), or tetrakis [3,4-bis (trifluoromethyl) phenyl] borate (electrode 2), as a fixed anionic site in a polymeric matrix of carboxylated polyvinyl chloride. Linear responses of hydroxyurea within a concentration range of 10−5–10−3M with slopes of 51.2 and 58.6 mV/decade with pH 3–6 were obtained by using electrodes 1 and 2, respectively. Two spectrofluorimetric methods involving the formation of drug–Al(III) complex (method 3) and drug–Mg(II) complex (method 4) at pH 5 were also investigated. These complexes emit fluorescence at wavelengths of 380 and 355 nm, after excitation at 305 nm, for Al and Mg complexes, respectively. The calibration graphs were rectilinear from 0.5 to 2.5 μg/mL for the Al complex and 1 to 5 μg/mL for the Mg complex. The 4 proposed methods display useful analytical characteristics for determination of hydroxyurea, with average recoveries of 100.2 ± 0.83 and 99.4 ± 1.81% in capsules and 99.7 ± 0.70 and 99.4 ± 1.25% in biological fluids for the potentiometric and fluorimetric methods, respectively. Results obtained by the proposed procedures were statistically analyzed and compared with those obtained by the U.S. Pharmacopeial method. The 4 proposed procedures were also used to determine the stability of the drug in the presence of its degradate, hydroxylamine.

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42

Radu, Aleksandar, Martin Telting-Diaz, and Eric Bakker. "Rotating Disk Potentiometry for Inner Solution Optimization of Low-Detection-Limit Ion-Selective Electrodes." Analytical Chemistry 75, no. 24 (December 2003): 6922–31. http://dx.doi.org/10.1021/ac0346961.

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43

Lai, Chun-Ze, Secil S. Koseoglu, Elizabeth C. Lugert, Paul G. Boswell, József Rábai, Timothy P. Lodge, and Philippe Bühlmann. "Fluorous Polymeric Membranes for Ionophore-Based Ion-Selective Potentiometry: How Inert Is Teflon AF?" Journal of the American Chemical Society 131, no. 4 (February 4, 2009): 1598–606. http://dx.doi.org/10.1021/ja808047x.

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Pirabul, Kritin, Penjit Srinophakun, Anusith Thanapimmetha, and Maythee Saisriyoot. "Development of Lipid/Polymer Membrane by Reduced Graphene Oxide for Sugar Sensor." Materials Science Forum 936 (October 2018): 98–102. http://dx.doi.org/10.4028/www.scientific.net/msf.936.98.

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The sweetness sensor has been developed for sensing sweeteners using lipid/polymer membrane as ion selective membrane in potentiometry measurement. In this work, effects of blending reduce graphene oxide (rGO) at 1.25, 2.5 and 3.75 wt.% during conventional lipid/polymer membrane preparation to increase electrical responsive was investigated. The results demonstrated that the lipid/polymer/rGO-3.75% membrane has the highest response, which was 13.06 and 18.21 % increment (at 0.1 M and 0.3 M of sucrose, respectively) from the conventional lipid/polymer membrane.

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Tromans, Andrew, Glenn Hefter, and Peter M. May. "Potentiometric Investigation of the Weak Association of Sodium and Oxalate Ions in Aqueous Solutions at 25°C." Australian Journal of Chemistry 58, no. 3 (2005): 213. http://dx.doi.org/10.1071/ch04230.

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The formation constant β(NaOx−) of the extremely weak ion pair formed between sodium (Na+) and oxalate (Ox2−) ions in aqueous solutions has been determined at 25°C as a function of ionic strength in tetramethylammonium chloride by Na+ ion-selective electrode potentiometry. The effects of trace Na+ impurities from all reagents were accounted for. An extrapolated value for β o of 6.6 ± 0.5 M−1 was obtained at infinite dilution, which is in good agreement with literature values. Attempts to measure this constant in 1 M CsCl media gave a β(NaOx−) value of 0.00 ± 0.06 M−1, probably because of competition between Cs+ and Na+ for Ox2−.

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van den Hoop, Marc A. G. T., Rob F. M. J. Cleven, Johannes J. van Staden, and Jos Neele. "Analysis of fluoride in rain water comparison of capillary electrophoresis with ion chromatography and ion-selective electrode potentiometry." Journal of Chromatography A 739, no. 1-2 (July 1996): 241–48. http://dx.doi.org/10.1016/0021-9673(96)00029-5.

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Suljkanović, Mersiha, Malgorzata Grabarczyk, Cecylia Wardak, Marzena Adamczyk, and Karolina Pietrzak. "Electrochemical sensors as simple and cheap devices for rapid determination of various species in environmental samples." Environmental engineering 6, no. 1 (July 16, 2019): 1–6. http://dx.doi.org/10.37023/ee.6.1.1.

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The electrochemical methods are very good tool for determination of trace concentrations of various species in water samples. The analysis carried out using these methods are usually simple, fast and also the cost of the required equipment is much lower comparing to other instrumental methods. Furthermore, the electroanalytical methods are easy to automate and computerize. Among five major groups of these methods (potentiometry, voltammetry, coulometry, conductometry and dielectrometry), potentiometry and voltammetry attract the greatest attention of researchers. In this paper, experimental results of research related to development of procedures (voltammetric and potentiometric) for the determination of elements in environmental water samples were presented. Due to their common occurrence in environment and possible toxic effects on living organisms, vanadium and nitrate ions were selected for investigation. Optimization of voltammetric procedure for V(V) determination were carried out in matrix containing different surfactants and humic acids, using lead film electrode as a working electrode. Results showed that only nonionic surfactant Brij-35 did not interfere with the voltammetric signal. Other surfactants as well as humic acids reduced the signal, and possibility of their elimination with suitable resins were also investigated. Potentiometric measurements were consisted of preparation and determination of analytical properties of nitrate ion-selective electrodes with solid contact. The results showed that among three different membrane composition, the best response was achieved by membrane containing: Ni(Phen)2, THTDPCl, PVC and NPOE in the ratio of 1:2:33:64 wt. %, respectively. With the detection limit of 2.8 × 10-6 mol L-1, the working concentration range from 5 × 10-5 to 1 × 10-1 mol L-1 and a slope of -55.1 mV per decade, this electrode showed good selectivity to sulfate, acetate, carbonate, dihydrogen phosphate, fluoride and chloride ions, and also good potential reversibility.

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Pilbáth, Zsuzsanna, Viola Horváth, György Horvai, and Péter Huszthy. "Enantiomeric discrimination of chiral crown ether ionophores containing phenazine subcyclic unit by ion-selective potentiometry." Periodica Polytechnica Chemical Engineering 54, no. 1 (2010): 3. http://dx.doi.org/10.3311/pp.ch.2010-1.01.

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Alexander, Peter W., Telis Dimitrakopoulos, and D. Brynn Hibbert. "A photo-cured coated-wire calcium ion selective electrode for use in flow injection potentiometry." Talanta 44, no. 8 (August 1997): 1397–405. http://dx.doi.org/10.1016/s0039-9140(97)00011-8.

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Alexander, Peter W., Telis Dimitrakopoulos, and D. Brynn Hibbert. "A photo-cured coated wire potassium ion-selective electrode for use in flow injection potentiometry." Electroanalysis 9, no. 11 (July 1997): 813–17. http://dx.doi.org/10.1002/elan.1140091102.

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