Evaluation of perchlorate tolerant photo-cured calcium selective electrodes for use in flow injection potentiometry

Benedetto, Lucy T. Di; Dimitrakopoulos, Telis; Farrell, John R.; Iles, Peter J.

doi:10.1016/s0039-9140(96)02057-7

Cited by 14 publications

(6 citation statements)

References 8 publications

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“…Many solutions have been put forward to resolve problems related to leaching, adhesion, and the photocurability of ion-sensor membranes. Complicated procedures for grafting of various membrane components were used to avoid leaching, − and the reduced use or elimination of plasticizer from the membrane has been attempted − with conventional polymers for ion-selective membranes (e.g., polysiloxane and polyurethane). −,− The use of other photopolymers, especially the methacrylates and epoxyacrylate, −,− has been reported, but, except for the polysiloxane-based matrixes, these other matrixes need 20−40% (w/w) of plasticizers to yield functional ion-selective membranes.…”

mentioning

confidence: 99%

Producing “Self-Plasticizing” Ion-Selective Membranes

1999

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Polymer membranes have been explored for the analysis of ions that do not require plasticizers and with photocurable properties. This work was focused on investigating the viability of the methacrylic-acrylic copolymers as new self-plasticizing membrane matrixes for ion-selective electrodes or other ion-sensor applications. Copolymers with glass transition temperatures ranging from -20 to -44 degrees C could be prepared without added plasticizer and were found to be functional as ion-selective membranes. Both free-radical solution polymerization and photopolymerization could be used, and "self-plasticizing" behavior of copolymers was observed with a high alkylacrylate (R = C4) content. This was found to be compatible with most commercially available ionophores, and sensors for potassium, sodium, calcium and pH were fabricated entirely by photocure procedures; single-step procedures for the immobilization of benzo-15-crown-5 ionophore on these self-plasticizing copolymer matrixes were also developed. Even though the ionophore was immobilized, potentiometric studies revealed that the ionophore remained functional, and thus, these copolymers have the advantage of suffering neither leaching of ionophore nor plasticizers. All these sensors exhibited a Nernstian or near Nernstian response with selectivity comparable to plasticized PVC membranes or other plasticized and photocurable polymer membranes. The long-term response of the potassium sensor with immobilized ionophore and the sodium sensor showed little deterioration for as long as one month and three months, respectively, under continuous use.

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mentioning

confidence: 99%

Producing “Self-Plasticizing” Ion-Selective Membranes

1999

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“…The selectivity behaviour of a certain ion selective sensor is greately dependent on the ionophore used [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. In preliminary experiments, investigations were conducted to determine the anionic response of the [NiL]SO 4 based membranes.…”

Section: Resultsmentioning

confidence: 99%

PVC Membrane perchlorate Anion Sensor for [NiL]SO4

Chandra¹

2012

IOSRJAC

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shown in [figure 1] showed a selective interaction between complex and perchlorate anion respect to the other anions tested. The sensor worked well with a Nernstian response of 1.0 x 10-1-7.0 x 10-7 M, detection limit 4x10-7 M. The electrode had relatively short response time, 6s, and it was found to produce stable responses for more than two months. It was also used for monitoring of perchlorate ion concentration in water and urine samples.

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“…Materials: All reagents were used as received from the suppliers: calcium chloride (BDH, AR), potassium nitrate (BDH, AR) and Preparation of the coated wire electrodes: The chloride CWE was prepared by electrochemically anodizing a Ag wire (0.5 mm internal diameter (id)) with potassium chloride [18]. Precured membranes were ultrasonically mixed for 3 h and using thin nylon brushes were each applied directly onto a 0.5 mm in diameter Ag wire embodied in a single electrode body made with poly(methylmethacrylate) as shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of a Four Sensor Array Used in a Wall-Jet Configured Flow Cell for Flow Injection Potentiometry

Dimitrakopoulos

2001

Electroanalysis

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Photo‐cured calcium, potassium, and nitrate ion‐selective electrodes and Ag/AgCl wire as a chloride electrode have been integrated into a sensor array that is suitable for FIP measurements in a wall‐jet flow cell. Each sensor in the electrode‐array exhibited near‐Nernstian response over a log‐linear range between 0.1 mM and 10 mM and detection limits of 0.01 mM in the flow injection potentiometric mode. The four coated wire electrodes were used simultaneously in the flow injection mode to determine their respective determinand in various water samples and the results were in good agreement with standard analytical methods.

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Evaluation of perchlorate tolerant photo-cured calcium selective electrodes for use in flow injection potentiometry

Cited by 14 publications

References 8 publications

Producing “Self-Plasticizing” Ion-Selective Membranes

Producing “Self-Plasticizing” Ion-Selective Membranes

PVC Membrane perchlorate Anion Sensor for [NiL]SO4

Evaluation of a Four Sensor Array Used in a Wall-Jet Configured Flow Cell for Flow Injection Potentiometry

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