Results 211 to 220 of about 59,300 (253)
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Ion transport in PVC—DOPP membranes
Electrochimica Acta, 1993Abstract Conductivity measurements have been made on PVC—DOPP membranes containingdissolved CaI2 in both a wet and a dry condition. The conductivity in both cases is proportional to the CaI2 concentration at low salt concentrations. Transference number measurements have been made using cells of the type Download : Download full-size image
R.D. Armstrong, Hong Wang
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Time dependent effects in PVC membranes
Electrochimica Acta, 1987Abstract A number of situations which give rise to time dependent impedances have been explored experimentally for plasticized PVC membranes in contact with aqueous solutions. Most of the measurements can be explained by assuming that there is loss (or in some cases gain) of ions from the membranes to the contacting aqueous solutions, in such a way ...
R.D. Armstrong, M. Todd
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PVC membrane electrodes of anisodamine, N-butylscopolamine and homatropine
The Analyst, 1988PVC membrane electrodes of anisodamine, N-butylscopolamine and homatropine were prepared with an alkaloid-tetraphenylborate ion-associate complex as the electroactive material. The response, selectivity and stability of these electrodes are good. Use of the electrodes in potentiometric methods to determine these drugs is simpler, faster and more ...
B Y, Li +4 more
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PVC membrane based potentiometric sensors for uranium determination
Talanta, 2001Two novel uranyl PVC matrix membrane sensors responsive to uranyl ion are described. The first sensor incorporates tris(2-ethylhexyl)phosphate (TEHP) as both electroactive material and plasticizer and sodium tetraphenylborate (NaTPB) as an ion discriminator. The sensor displays a rapid and linear response for UO(2)(2+) ions over the concentration range
S S, Hassan, M M, Ali, A M, Attawiya
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Rapid microestimation of proteins by membrane chromatography on PVC ultrafilters
Experientia, 1970Chromatographische Entwicklung von Proteinen auf PVC-Membranfiltern und Flachenbestimmung des adsorbierten Films zur raschen Protein-analyse wurden beschrieben.
T I, Pristoupil, M, Kramlová
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Functionalization of PVC membrane with ss oligonucleotides for a potentiometric biosensor
Biosensors and Bioelectronics, 2007A novel application of a single stranded (ss) oligonucleotide as an active component of polymeric membrane in an ion-selective electrode (ISE) is described. The original oligonucleotides, oligo(dA)(15), modified by cholesterol, triphenylmethyl and hexadecyl derivatives, were immobilized into poly(vinyl chloride) (PVC) membrane using extraction protocol.
T V, Shishkanova +3 more
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Urea sensors based on PVC membrane pH electrode
Talanta, 1994Several procedures of urease immobilization on the surface of the polymeric membrane pH electrode with tri-n-dodecylamine as a neutral carrier were compared. The best results were obtained for the urea sensor with covalently bound urease. The sensor characteristics including the effect of buffer, pH and concentration and the effect of stirring rate are
S, Głab +4 more
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Ribbed PVC–silica mixed matrix membranes for membrane bioreactors
Journal of Membrane Science, 2016Abstract The feasibility of ribbed-PVC–silica mixed matrix membranes (MMM) in a membrane bioreactor (MBR) application was investigated. Three operational aspects were evaluated: inclusion of vibration, use of relaxation (cycle time), and optimization of the cleaning procedure.
Lisendra Marbelia +4 more
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Properties of DOPP in plasticized PVC membranes
Journal of Electroanalytical Chemistry, 1995It is found that the dielectric constants of the poly(vinyl chloride) (PVC)/dioctylphenyl phosphonate (DOPP) membranes show a greater similarity to that of the PVC/dioctyl sebacate than that of the PVC/o-nitrophenyloctylether. Despite the rather low dielectric constant of the 33% PVC/DOPP membranes, Ca(BPh 4 ) 2 can be exchanged into them from the ...
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Urea Biosensors Based on PVC Membrane Containing Palmitic Acid
Artificial Cells, Blood Substitutes, and Biotechnology, 2005A new urea biosensor was prepared by immobilizing urease with four different procedures on poly(vinylchloride) (PVC) ammonium membrane electrode containing palmitic acid by using nonactine as an ammonium-ionophore. The analytical characteristics were investigated and were compared those of the biosensor prepared by using carboxylated PVC. The effect of
Pekyardımcı, Şule +2 more
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