Abstract: To provide to a reagent composition used in quantitative measurement of lithium in aqueous solutions such as biological specimens and environmental liquid samples by a simple colorimeter or ultraviolet-visible light spectrophotometer immediately, a reagent composition which permits to measure a concentration of lithium by visual observation, and a method and apparatus for measuring lithium ion by using the reagent. A reagent composition for measuring lithium comprising F28 tetraphenylporphyrin compound as chelating agent, including further a water-soluble organic solvent, a pH modifier and a stabilizer, and a method and apparatus for measuring lithium ion by using the reagent.

Abstract: A lithium reagent composition for determining lithium concentration, with which it is possible to instantaneously determine the amount of lithium contained in an aqueous solution, such as a biosample or an environmental sample, by means of a simple colorimeter or ultraviolet-visible spectrophotometer and which renders a visual assessement possible; and a method and device for quantifying lithium ions using the composition. A lithium reagent composition obtained by mixing the compound represented by the structural formula, wherein all of the hydrogen atoms bonded to carbon atoms of tetraphenylporphyrin have been replaced with fluorine atoms, as a chelating agent with a basic organic compound selected from monoethanolamine, diethanolamine, and triethanolamine and producing an aqueous solution thereof that further contains a pH regulator with which the pH has been regulated to 5 or higher; and a method and device for quantifying lithium ions using the composition.

Abstract: To provide to a method for measuring and examining lithium ions in an aqueous solution of a specimen such as biomaterials or environment samples, by using a lithium reagent composition as a coloration reaction reagent and by visual observing or a simple a colorimeter. The lithium ions measuring method is characterized by contacting the specimen including serum and plasma test sample with an aqueous solution of a lithium reagent composition comprising a tetraphenyl porphyrin compound, a pH regulator and a pH buffer, by irradiating or expose the resulting solution with white light, and by detecting change in color tone by a visual observation or by detecting the sensitivity by a colorimeter.

Abstract: To provide to a reagent composition used in quantitative measurement of lithium in aqueous solutions such as biological specimens and environmental liquid samples by a simple colorimeter or ultraviolet-visible light spectrophotometer immediately, a reagent composition which permits to measure a concentration of lithium by visual observation, and a method and apparatus for measuring lithium ion by using the reagent. A reagent composition for measuring lithium comprising F28 tetraphenylporphyrin compound as chelating agent, including further a water-soluble organic solvent, a pH modifier and a stabilizer, and a method and apparatus for measuring lithium ion by using the reagent.

Abstract: [Problem] To provide to a reagent composition used in quantitative measurement of lithium in aqueous solutions such as biological specimens and environmental liquid samples by a simple colorimeter or ultraviolet-visible light spectrophotometer immediately, a reagent composition which permits to measure a concentration of lithium by visual observation, and a method and apparatus for measuring lithium ion by using the reagent. [Solution] A reagent composition for measuring lithium comprising F28 tetraphenylporphyrin compound as chelating agent, including further a water-soluble organic solvent, a pH modifier and a stabilizer, and a method and apparatus for measuring lithium ion by using the reagent.

Abstract: A lithium reagent composition for determining lithium concentration, with which it is possible to instantaneously determine the amount of lithium contained in an aqueous solution, such as a biosample or an environmental sample, by means of a simple colorimeter or ultraviolet-visible spectrophotometer and which renders a visual assessement possible; and a method and device for quantifying lithium ions using the composition. A lithium reagent composition obtained by mixing the compound represented by the structural formula, wherein all of the hydrogen atoms bonded to carbon atoms of tetraphenylporphyrin have been replaced with fluorine atoms, as a chelating agent with a basic organic compound selected from monoethanolamine, diethanolamine, and triethanolamine and producing an aqueous solution thereof that further contains a pH regulator with which the pH has been regulated to 5 or higher; and a method and device for quantifying lithium ions using the composition.

Abstract: [Problem] To provide to a reagent composition used in quantitative measurement of lithium in aqueous solutions such as biological specimens and environmental liquid samples by a simple colorimeter or ultraviolet-visible light spectrophotometer immediately, a reagent composition which permits to measure a concentration of lithium by visual observation, and a method and apparatus for measuring lithium ion by using the reagent. [Solution] A reagent composition for measuring lithium comprising F28 tetraphenylporphyrin compound as chelating agent, including further a water-soluble organic solvent, a pH modifier and a stabilizer, and a method and apparatus for measuring lithium ion by using the reagent.