Infusible inorganic base type ion chloride response a composite and this one using infusible inorganic base type ion chloride response wall manufacture method and infusible inorganic base type ion chloride response wall using ion chloride selection nature sensor

摘要

PURPOSE: Provided are inorganic salt type chloride ion-sensitive composition with distinct selectivity of Cl- and excellent electrochemical property, the preparation method of inorganic salt type chloride ion-sensitive membrane using the composition, and chloride ion-sensitive electrode using the membrane with improved reliability compared to a conventional chloride ion-sensitive electrode. CONSTITUTION: The chloride ion-sensitive composition is prepared by mixing Ag2S and AgCl in a weight ratio of 1.73 : 1, where the precipitates, Ag2S and AgCl, are formed by mixing AgNO3, Na2S and KCl in a molar ratio of 3 : 1 : 1.3 at 75deg.C for 1hr., which are represented by the formulas, 2AgNO3 + Na2S --Ag2S + 2NaNO3, AgNO3 + KCl --AgCl + KNO3. The chloride ion-sensitive membrane is obtained by the following steps: washing the composition with 80deg.C of water and acetone, and filtering; drying at 70deg.C over 12hrs.; powdering; pressing 0.5g of the composition under 4-5ton/cm¬2 of pressure. The chloride ion-sensitive electrode(100) comprises the parts of: an electrode body(110) with an inlet(112) for an inner reference solution prepared by saturating 80-95wt.% of glycerol solution with KCl; a working electrode(120), the prepared membrane, with potential change according to the concentration of Cl- in a sample solution; a reference electrode(130), Ag/AgCl, with constant potential; a liquid junction part(140), a ceramic rod with 5mm of diameter and less than 6mm of thickness, which keeps an outflow speed of the inner reference solution constant, 3-30microliter/hr.; and an electrode-connecting part.