The electrode measures sodium concentration in water samples. A beginners guide to ionselective electrode measurements. Eric bakker, in encyclopedia of analytical science third edition. It is possible that an excess of an interfering ion can lead to higher or lower concentrations of the measured ion. Schematic structure of an ion sensitive measuring system with ise ion sensitive electrode, ref reference electrode and voltmeter. Determination of sodium with ionselective electrodes.
The use of buffers in the determination of fluoride by an ion. Abstract the influence of the composition of buffer solutions on fluoride analyses by the fluoride ion selective electrode was studied. Abstract solution phase syntheses and sizeselective separation methods to prepare semiconductor and metal nanocrystals, tunable in size from. Electrode will need to be rejuvenated see accumet instruction sheet if the difference falls out of this range. Pdf ion selective electrodes in environmental analysis. Determination of sodium with ion selective electrodes. Ion selective electrode measurement fundamentals in. Our sensors are modular and offer an integrated reference system that gives an allinone solution no additional reference electrode needed. Ionselective electrode an overview sciencedirect topics. Ammonia selective electrode, orion model 9510 or 9512, or equivalent. Us4708776a sodium ion selective electrode and method of use.
The advent of ion selective electrodes made possible the potentiometry of sodium in serum and plasma. Examples are used to show how determinations can be carried out with the 692 phion meter using either direct measurement or the standard addition technique. Residual fluoride content of reagents was observed to restrict the use of some buffers and reagents in lowlevel work. An ion selective electrode ise, also known as a specific ion electrode sie, is a transducer or sensor that converts the activity of a specific ion dissolved in a solution into an electrical potential. The selectivity of the calcium and magnesium ises is not fully achieved as other cationic species may interfere with the. The determination of free longchain quaternary ammonium species with an ion selective electrode based on a cetyltrimethylammonium ion pair. Get practical tips and hints from our ise experts for your daily work in the laboratory. A sodiumselective sensor and differential sodiumselective sensor on anodizedito were analyzed in this paper, and the structure is suitable to be developed as an array structures and multisensors because of its simple fabrication, low cost, good characteristics, and high integration. Sodium determination using ionselective electrodes, mohr.
Ion selective electrode measurement fundamentals in online. An electronic calculation circuit converts emf of the sample to the. An improved dryoperative ion selective electrode for the determination of sodium ions in aqueous fluids includes a dried internal reference electrode, a dried reference layer and a sodium ion selective membrane composed of a binder. A sodium ionselective electrode based on a neutral carrier. A ph electrode is only a rather special case of an almost perfectly selective ion selective electrode but the principles and practice are the same in. Print pdf page intellical isena381 is a digital, combination, sodium ion selective electrode ise with a refillable double junction reference and builtin temperature sensor. These methods were based on dilution of serum, as done in flame photometry, and the results were identical. Operating range metric saturated to 106 m, saturated to 0. Learn more about our perfection and click and clear technology. Iii a layer of a waterinsoluble salt of said metal such as a silver chloride layer. A comparison of the measurement of sodium and potassium by.
When the selective electrode is immersed in the sample, a potential develops in the membrane, caused by a selective and spontaneous reaction. The optimum ph for lowlevel fluoride determinations was found to be around 5, which can be maintained by a sodium acetateacetic acid. D catalogue of nico2000 electrochemical products pdf. Sensors free fulltext study of sodium ion selective. Responsive over a wide concentration range not affected by color or turbidity of sample rugged and durable rapid response time real time measurements low cost to purchase and operate. It is an ion selective electrode which is coated with an enzymecontaining acrylamide gel. Iv an electrolyte layer which comprises electrolyte salt of a sodium ion with the same anion as the anion of the waterinsoluble salt. C operating instructions for elit ionselective electrodes includes all the latest updates. The reference electrode should provide a highly stable potential for an extended period of time. Us4708776a sodium ion selective electrode and method of. Ionselective electrodes are used in analytical chemistry and biochemical. The determination of free longchain quaternary ammonium species with an ionselective electrode based on a cetyltrimethylammonium ion pair. The voltage is theoretically dependent on the logarithm of the ionic activity, according to the nernst equation.
A ph electrode is only a rather special case of an almost perfectly selective ion selective electrode but the principles and practice are the same in both cases. Ion selective electrodes in environmental analysis article pdf available in journal of the serbian chemical society 7811. Conventional voltmeters cannot be used because only very small currents can be drawn. The reference layer contains a metal salt and a hydrophilic binder material, and is buffered to a ph of from about 4 to about 8 with a watersoluble.
The determination of sodium with the sodium ise represents a selective, rapid, accurate, and favorablypriced method which is described in this bulletin. Sodium electrode, sodium ise, sodium ion selective. Analysis of whole blood precludes dilution and so direct potentiometry was developed. Ion selective electrode theory guide mettler toledo. Indirect ion selective electrode methods potentially. An ion sensitive measuring system basically consists of the ise reacting on a special ion type and a reference electrode that are jointly immersed in the sample to be measured see figure below. Electrode operation is highly dependent on proper use and care. Two types of methods using ises are currently in use within clinical laboratories. Ammonium ion selective electrode ps3516 products pasco. However, their assertion that this is not a problem when an ionselective electrode ise is used for sodium analysis needs clarification.
Discover our wide range of ionselective electrode options to meet the various range of measurable ions. Operation of these ion selective electrodes assumes training in the safe handling of flammable, caustic and corrosive chemicals and a working knowledge of serial dilution and calibration procedures. Applicable to foods containing 100 mg na100 g or less. Study of sodium ion selective electrodes and differential. An ionselective electrode ise, also known as a specific ion electrode sie, is a transducer or sensor that converts the activity of a specific ion dissolved in a solution into an electrical potential. Which of the following is not the characteristic of ion selective electrodes. The sodium concentration has been determined in standard solutions, water samples. Ionselective electrodes ises are electrochemical ion sensors that convert the activity of a target ion into an electrical potential as the measurable signal. A sodium ionselective electrode based on a neutral. Ionselective electrodes postgraduate medical journal. An improved dryoperative ionselective electrode for the determination of sodium ions in aqueous fluids includes a dried internal reference electrode, a dried reference layer and a sodium ionselective membrane composed of a binder material.
The sodium ion selective electrode has a solidstate pvc polymer matrix membrane. General analytical procedures, electrode characteristics and electrode theory are also included in this user guide. Pasco ion selective electrodes are industrialquality probes that give excellent results when properly used. Preparation of sodium ion selective electrodes was such that 33 mg of the main pvccooh was dissolved in 0.
The sodium ionselective electrode has a solidstate pvc polymer matrix membrane. A little theory these are electrodes with a sensitive membrane, selective for a particular ion. Influence of ion exchanger and diluent structure on uranyl ion selective electrode response. The introduction of the directreading ion selective electrode has led to a reexamination of the basic concepts of the methods involved, and this in turn to a reassessment of the interpretation of the measurement of sodium in certain clinical situations. Both electrodes show a linear response to sodium ion activities in the range of 10. Examples are used to show how determinations can be carried out with the 692 ph ion meter using either direct measurement or the standard addition technique. The principle of ise is the same as for measuring ph, but by varying the composition of the glass in the sensing electrode, the electrode can be made sensitive to sodium or chloride ions.
Determine the sodium content of various foods with sodium andor chloride ion selective electrodes. Silversulfide ion selective electrode user guide 1 introduction this user guide contains information on the preparation, operation and maintenance for the silversulfide ion selective electrode ise. The ise module measures the emf difference between an ionselective electrode and a reference electrode. Stir solution approximately 30 seconds and record the millivoltage. Indirect ion selective electrode methods potentially overestimate peritoneal dialysate sodium losses. The support is a sheet of cellophane or a piece of gauze made from. Check and maintain the electrode according to the manufacturers instructions.
This electrode can be manufactured with significantly less waste and exhibits improved uniformity in performance. Download the free ion selective electrode guide and learn the basics of correct and accurate ise measurements. Ii an electroconductive metal layer such as a silver metal layer. The advent of ionselective electrodes made possible the potentiometry of sodium in serum and plasma. To measure this potential a reference electrode is. The emf of the ionselective electrode is dependent on the ion concentration of the sample. However, their assertion that this is not a problem when an ion selective electrode ise is used for sodium analysis needs clarification. The use of buffers in the determination of fluoride by an. Sodium ionselective electrode updated september 20. Sodium halfcell ion selective electrode, bnc connector. An integral ion selective electrode for analysis of a potassium ion, etc. The gel and enzyme are held in place on the surface of the ion selective electrode by an inert physical support.
Sodium electrode, sodium ise, sodium ion selective electrode. Determine the sodium content of various foods with sodium andor chloride ionselective electrodes. The introduction of the directreading ionselective electrode has led to a reexamination of the basic concepts of the methods involved, and this in turn to a reassessment of the interpretation of the measurement of sodium in certain clinical situations. Preparation of monodisperse samples enables systematic. The measurement of the concentration or activity of an ion in a solution by means of an ion selective electrode is as simple as making a routine ph measurement. Determination of sodium with the ionselective electrode. E ms power point presentation about elit ion analyser systems.