PVCマトリックス膜型塩素酸イオン電極

概要

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An ion-selective electrode with a polyvinyl chloride matrix membrane responsive to chlorate ion was developed. The PVC(polyvinyl chloride) matrix membrane was prepared by the following procedure; A PVC solution (12.5% tetrahydrofuran solution), dioctyl phthalate and a 1,2-dichloroethane solution(11.1%) of trioctylmonomethyl ammonium chlorate salt in the weight ratio of 16:4:9 were mixed. The mixture was spread on a glass plate and stood more than 48 hours in order to evaporate the solvents. A disk membrane{(5〜10)mm diameter} was afiixcd to a PVC tube(I.D.:6mm,O.D.:12mm) or to an Orion Model 92 electrodc body. The following electrochemical cell was assembled to examine the response of the membrane. [○!+] Ag-AgCl/reference soln./PVC membrane/ (ion-selective electrode) sample soln./SCE [○!-] The chlorate ion-selective electrode exhibited a Nernstian. response to the chlorate ion down to 10^<-4>M. The membrane potential was independent of pH from 1.0 to 11. The interferences of chloride, sulfate, and acetate ions were extremely low for the determination of chlorate ion by this electrode. Nitrate, iodide, and perchlorate ion sinterfered. The chlorate ion concentration in the sample solution containing iodide ion as an interfering ion could be easily measured by the use of a standerd addition-Gran's plot method after precipitadng iodide ion as silver iodide by adding silver sulfate powder.
1977-01-10