Abstract: A calibration liquid (1) is used for calibrating a water quality measurement device (100). The water quality measurement device (100) includes a plurality of sensors to be brought into contact with a measurement target liquid so as to measure concentrations of a plurality of types of target components contained in the measurement target liquid, and measures the concentrations of the plurality of types of target components. The calibration liquid (1) includes a solution which contains the plurality of types of target components at respective concentrations determined for the target components, and the solution has a pH within a predetermined pH range.

Abstract: Provided is an ionic-liquid-containing polymer capable of further downsizing a comparison electrode or the like and further improving the degree of freedom in design while reducing the manufacturing cost. The ionic-liquid-containing polymer used as a salt bridge of the comparison electrode contains an adhesive and a hydrophobic ionic liquid.

Abstract: A water quality measuring system includes a first introduction section for introducing rearing water as a sampling target, and a first adding section which adds an acid to the rearing water introduced by the first introduction section, and a nitrous acid sensor whose measurement target is nitrous acid and which measures the measurement target concentration of the rearing water to which the acid has been added by the first adding section. The water quality measuring system includes a second adding section which adds a base to the rearing water introduced by the first introduction section, and an ammonia sensor whose measurement target is ammonia and which measures the measurement target concentration of the rearing water to which the base has been added by the second adding section.

Abstract: This invention relates to a correction liquid for a liquid membrane type ion-selective electrode that makes it possible to measure a ratio between a sodium ion concentration and a potassium ion concentration in urine by correcting for an influence from an ionic strength of the urine. The correction liquid comprises a sodium ion-sensitive part that selectively reacts with the sodium ion and a potassium ion-sensitive part that selectively reacts with the potassium ion, and measures a ratio between a sodium ion concentration and a potassium ion concentration in urine, and comprises the sodium ion, the potassium ion, and an electrolytic ionic strength modifier.

Abstract: This invention relates to a liquid membrane type ion-selective electrode that can restrain an electric potential fluctuation of an inner electrode due to ultraviolet rays and that can conduct an analysis with high accuracy. The liquid membrane type ion-selective electrode comprises a liquid membrane type ion-sensitive membrane wherein a predetermined ionophore is supported by a base material, an inner electrode that has electrical conductivity and that is arranged at a position on the ion-sensitive membrane through which light transmitted is incident, an internal solution that contains an electrolyte and that makes contact with the ion-sensitive membrane and the inner electrode, wherein the ion-sensitive membrane contains an ultraviolet absorber or an ultraviolet reflecting agent having an insulative property.

Abstract: In order to provide a planar type multi-ion sensor which is easily thinned and has high measurement accuracy, a multi-ion sensor 1 adapted to measure a concentration ratio of sodium ions to potassium ions in a sample solution, includes: a sodium ion electrode 41 selectively reacting to the sodium ions; a potassium ion electrode 42 selectively reacting to the potassium ions; and a common electrode 28 in contrast with the sodium ion electrode 41 and the potassium ion electrode 42, wherein the sodium ion electrode 41, potassium ion electrode 42 and common electrode 28 are provided on the same support body, the common electrode 28 does not include internal solution, and the concentration ratio of the sodium ions to the potassium ions is measured based on a variable A that is obtained by the following Equation (1), FIG . ? 7 A = E Na Q × ? Na - E K Q × ? K .

Abstract: The present invention is intended to enable silver ions in an internal electrolyte solution of a reference electrode to be suppressed from being eluted, and also suppress a potential variation that occurs due to production of a poorly-soluble silver compound on surfaces of a liquid communication part and the like, and specifically provided with: an internal electrode formed of a silver/silver chlorides electrode; an internal electrolyte solution that is in contact with the internal electrode; and a containing body that contains the internal electrolyte solution, in which the containing body is formed of a material that does not have anionic conductivity but has cationic conductivity and moisture permeability.

Abstract: The present invention is mainly intended to provide a pretreatment system that can use an calcium ion electrode to accurately measure calcium ion concentration with a simple configuration, and the pretreatment system is a pretreatment system 1 that is intended to perform pretreatment before measuring calcium ion concentration in a sample solution containing a calcium compound with a calcium ion electrode, and provided with: an acid adding mechanism 3 that adds acid to the sample solution; and a base adding mechanism 4 that adds base to the sample solution added with the acid.

Abstract: In order to provide a planar type multi-ion sensor which is easily thinned and has high measurement accuracy, a multi-ion sensor 1 adapted to measure a concentration ratio of sodium ions to potassium ions in a sample solution, includes: a sodium ion electrode 41 selectively reacting to the sodium ions; a potassium ion electrode 42 selectively reacting to the potassium ions; and a common electrode 28 in contrast with the sodium ion electrode 41 and the potassium ion electrode 42, wherein the sodium ion electrode 41, potassium ion electrode 42 and common electrode 28 are provided on the same support body, the common electrode 28 does not include internal solution, and the concentration ratio of the sodium ions to the potassium ions is measured based on a variable A that is obtained by the following Equation (1), Fig .

Abstract: A reference electrode for improving a product life cycle without using a gelled hydrophobic ionic liquid having a prescribed hardness or viscosity and without having a large thickness so as to be difficult to manufacture is provided. The reference electrode is provided with a housing for accommodating an internal electrode, a filler for electrically connecting the internal electrode, and a sample liquid. The filler is formed having a layer between the internal electrode and an opening formed in the housing for contacting the sample liquid and the filler. The filler includes a first layer including a water soluble electrolytic solution formed to be in contact with the internal electrode a second layer including a hydrophobic ionic liquid formed to be in contact with the first layer; and a third layer including a gelled hydrophobic ionic liquid formed in the opening so as to be in contact with the second layer.

Abstract: This invention provides a reference electrode that can be downsized and stable in voltage. The reference electrode in accordance with this invention is a reference electrode that does not require an internal aqueous solution such as a KCl aqueous solution and comprises a metal body, a slightly soluble salt film that comprises a slightly soluble salt of the metal body and that coats the metal body and a hydrophobic ionic liquid that is arranged to make contact with both the slightly soluble salt film and a sample to be measured.

Abstract: A reference electrode for improving a product life cycle without using a gelled hydrophobic ionic liquid having a prescribed hardness or viscosity and without having a large thickness so as to be difficult to manufacture is provided. The reference electrode is provided with a housing for accommodating an internal electrode, a filler for electrically connecting the internal electrode, and a sample liquid. The filler is formed having a layer between the internal electrode and an opening formed in the housing for contacting the sample liquid and the filler. The filler includes a first layer including a water soluble electrolytic solution formed to be in contact with the internal electrode a second layer including a hydrophobic ionic liquid formed to be in contact with the first layer; and a third layer including a gelled hydrophobic ionic liquid formed in the opening so as to be in contact with the second layer.

Abstract: Disclosed are a measurement method and a measurement apparatus both of which can measure the content of water or an organic acid in a polar organic solvent with high accuracy even when water or the organic acid is contained in the polar organic solvent at a low content. The content of water or an organic acid in a polar organic solvent can be measured by using, as a work electrode, an ISFET electrode in which a thin film comprising an oxide or nitride of a metal or metalloid element belonging to Groups 3 to 15 is formed on a gate.

Abstract: Disclosed is a sensitive glass for use in a pH-sensitive glass electrode, which comprises at least Me2O3 (Me represents a lanthanoid) and further comprises Y2O3 or Sc2O3 in an amount smaller than that of the Me2O3. Also disclosed is a sensitive glass for use in a cation-sensitive glass electrode, which comprises at least Y2O3 or Sc2O3.

Abstract: A reference electrode traps silver ions and chloro complex ions leaching to an internal filling solution so that the blocking of the liquid junction can be prevented. A silver/silver chloride electrode can be provided as an internal electrode in an internal filling solution; and a tube which houses, in order from top to bottom, the internal electrode, an inorganic cation exchanger for trapping silver ions and/or chloro complex ions from leaching from the internal electrode, and a ceramic member for preventing the diffusion of the silver ions and/or the chloro complex ions to the internal filling solution.

Abstract: The present invention is intended to enable silver ions in an internal electrolyte solution of a reference electrode to be suppressed from being eluted, and also suppress a potential variation that occurs due to production of a poorly-soluble silver compound on surfaces of a liquid communication part and the like, and specifically provided with: an internal electrode formed of a silver/silver chlorides electrode; an internal electrolyte solution that is in contact with the internal electrode; and a containing body that contains the internal electrolyte solution, in which the containing body is formed of a material that does not have anionic conductivity but has cationic conductivity and moisture permeability.

Abstract: Disclosed is an ion-selective electrode having excellent mechanical strength, excellent durability, low membrane resistance and good ion response accuracy. This ion-selective electrode comprises a response glass membrane which has ion selectivity and is made of an oxynitride glass containing Li.

Abstract: An ion-selective electrode has a responsive glass membrane with an exterior thin film containing titanium dioxide of an anatase type that is continuously formed as an integrated body. The thin film, of several hundred nm in numbers, is electrically connected by an amount of titanium dioxide that will form a continuity in the thin film structure. The thin film can be porous and contain at least one metal selected from cobalt, nickel, tungsten, copper, platinum, gold, silver and iron. Additionally, significantly larger titanium dioxide particles of 0.02 ?m in diameter can be further mixed into the thin film.

Abstract: Disclosed is a sensitive glass film for a pH electrode, which is not deteriorated in its glass strength or pH-measuring function, which is hardly stained, and from which any stain can be removed easily. Also disclosed is a pH electrode having the sensitive glass film. A microparticle comprising rutile-type or brookite-type titanium dioxide or a microparticle comprising amorphous titanium dioxide is adhered directly on the glass film surface of a sensitive glass film for a pH electrode.

Abstract: Disclosed are a measurement method and a measurement apparatus both of which can measure the content of water or an organic acid in a polar organic solvent with high accuracy even when water or the organic acid is contained in the polar organic solvent at a low content. The content of water or an organic acid in a polar organic solvent can be measured by using, as a work electrode, an ISFET electrode in which a thin film comprising an oxide or nitride of a metal or metalloid element belonging to Groups 3 to 15 is formed on a gate.