Results 141 to 150 of about 3,456 (182)

Responses of H+ selective solvent polymeric membrane electrodes fabricated from modified PVC membranes

Talanta, 1993
Potentiometric responses of a novel class of pH sensitive ionophores, namely several phenoxazine derivatives, were tested in different modified PVC matrices. The ionophores were compounded into liquid membranes as usual or were covalently coupled to the polymeric matrix.
E, Lindner, V V, Cosofret, R P, Kusy, R P, Buck, T, Rosatzin, U, Schaller, W, Simon, J, Jeney, K, Tóth, E, Pungor   +9 more
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Urea Biosensors Based on PVC Membrane Ion-Selective Electrodes

Analytical Letters, 1996
Abstract This paper presents a general method of enzyme immobilization at the surface of ion selective membranes. Covalent binding of enzymes directly on the electrode surface is a very effective method that results in stable enzymatic membranes. As an example the construction of enzymatic sensors for urea determination based on ammonium and hydrogen ...
Izabela Wałcerz, Robert Koncki, Ewa Leszczyńska, Bożena Salamonowicz, Stanisław Głąb   +4 more
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The role of PVC in ion selective electrode membranes

Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1987
Abstract The behaviour of a solution of NaBPh4 in a PVC membrane plasticized by di-octyl sebacate is compared with a solution of NaBPh4 in pure liquid di-octyl sebacate. In the liquid the NaBPh4 is present as ion pairs with ~ 0.2% of these dissociated in a 1 mM solution. By contrast in the membrane 1 mM solution is 74% dissociated. This difference in
R.D. Armstrong, M. Todd
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Guanidinium-selective PVC membrane electrodes based on crown ethers

Analytica Chimica Acta, 1984
Abstract Guanidinium-selective membrane electrodes were constructed with dibenzo-24-crown-8, dibenzo-27-crown-9, tribenzo-27-crown-9 or dibenzo-30-crown-10. The detection limits and selectivity coefficients towards different interfering ions, such as Li + , Na + , K + , NH + 4 , Mg 2+ and Ca 2+ were determined.
Maria Bocheńska, Jan F. Biernat
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Metalloporphyrin Derivatives as Neutral Carriers for PVC Membrane Electrodes

Analytical Chemistry, 1994
The anion-sensitive membrane electrodes based on lipophilic metalloporphyrin derivatives (FeTPP) 2 O show similar anti-Hofmeister selectivity sequence: SCN - >I - >ClO 4 - >NO 2 - >Br - >Cl - >NO 3 - . The electrode with an optimum membrane composition has a linear response for SCN - between 10 -6 and 10 -1 mol/L, with a slope of 53.0 mV/p-SCN -
De. Gao, Jun-Zhong. Li, Ru-Qin. Yu, Guo-Dong. Zheng   +3 more
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Flow injection determination of ketotifen fumarate using PVC membrane selective electrodes

Bioelectrochemistry, 2009
In this study a PVC membrane electrode for determination of ketotifen fumarate is reported, where ketotifen tetraphenylborate (Keto-TPB) was used as ion exchanger. The electrode has linear range of 5.6x10(-6)-1.0x10(-2) and 1.0x10(-5)-1.0x10(-2) mol/L, with detection limits 2.37x10(-6)and 4.60x10(-6) mol/L in batch and flow injection analysis (FIA ...
M M, Khater, Y M, Issa, Sabrein H, Mohammed   +2 more
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PVC membrane electrodes for potentiometric determination of tripelennamine

Microchimica Acta, 1997
The construction of PVC matrix type tripelennamine ion selective electrodes and their use for direct potentiometry, potentiometric titration and flow injection analysis of tripelennamine cation are described. The membranes of these electrodes consist of tripelennamine-tetraphenylborate, reineckate and picrylsulfonate ion-association complexes dispersed
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Polymeric plasticizer extends the lifetime of PVC-membrane ion-selective electrodes

The Analyst, 2014
The nature of the plasticizer plays a pivotal role in the analytical performance of polymer membrane ion sensors. Conventional plasticizers suffer leaching or migration from the membrane and exudation, both of which could limit the lifetime of sensors based on plasticized membranes.
Elsayed M, Zahran, Andrea, New, Vasilis, Gavalas, Leonidas G, Bachas   +3 more
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Calibration free solid contact electrodes with two PVC based membranes

Sensors and Actuators B: Chemical, 2018
Abstract A new type of solid contact ion-selective electrodes (ISEs) with two PVC-based sandwiched membranes are described. The first membrane contains suspension of halogen salts of silver and alkaline metals as well as silver nanoparticles and is placed on Ag substrate or conducting substrate covered with silver.
Bartosz Bartoszewicz, Sylwia Dąbrowska, Andrzej Lewenstam, Jan Migdalski   +3 more
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RETRACTED: Bromhexine-Selective PVC Membrane Electrode Based on Bromhexinium Tetraphenylborate

Microchemical Journal, 1999
A bromhexine ion-selective PVC membrane electrode based on bromhexinium tetraphenylborate has been prepared with dioctyl phthalate as plasticizer. The electrode showed a linear response with a slope factor of 57.5 mV/concentration decade at 20°C over the concentration range from 4 x 10 -4 to 10 -1 M bromhexine.
S. Khalil, M.M. Elrabiehi
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