公开(公告)号：JPH11108917A

公开(公告)日：1999-04-23

申请号：JP28284497

申请日：1997-09-30

Applicant: TOA ELECTRONICS

Inventor： KATO EIJI ,  HAKETA YASUSHI ,  SATO TETSUYA

IPC: G01N31/16 ,  G01N27/06 ,  G01N35/00

Abstract: PROBLEM TO BE SOLVED: To obtain a titration control method in which a titration reagent is dropped always at proper intervals and in which a titration time is shortened by a method wherein the magnitude of a waiting time required for a detection by a sensor is controlled according to the magnitude of a change in the chemical quantity or the physical quantity of a solution to be inspected. SOLUTION: A pH electrode 3 as a sensor and a reference electrode 4 are inserted into a container 2 in which a solution L, to be inspected, at an automatic titration apparatus 1 is housed, and the respective electrodes 3, 4 are connected to an apparatus body 7 by respective lead wires 5, 6. Then, a titration reagent A is dropped, by every small amount, into the solution L, to be inspected, from a syringe 10, and a change in the chemical quantity or the physical quantity of the solution L to be inspected is measured by the sensor. At this time, according to the magnitude of the change in the chemical quantity or the physical quantity of the solution L, to be inspected, after a prescribed waiting time has elapsed since the titration reagent A is dropped, the magnitude of a waiting time required for a detection by the sensor after the titration reagent A is dropped next is controlled. Thereby, even when the change becomes large near the end point of a titrating operation, the end point can be detected surely, and the titrating operation can be performed with high accuracy.

公开(公告)号：JP2000111506A

公开(公告)日：2000-04-21

申请号：JP28576598

申请日：1998-10-07

Applicant: TOA ELECTRONICS

Inventor： HARADA YASUYUKI ,  MURAYAMA JIRO ,  HAKETA YASUSHI ,  SATO TETSUYA ,  KATO EIJI

IPC: G01N27/414 ,  G01N27/06 ,  G01N27/07 ,  G01N27/416

Abstract: PROBLEM TO BE SOLVED: To provide a measuring device with memory for automatically recognizing such information as the type and manufacturing number of an electrode without any need for setting a calibration or correction value each time when the electrode is replaced using a device body and for freely using the electrode for each application. SOLUTION: A measuring device 1 is provided with a device body 20 and a measurement electrode 10. An identification means for identifying the measurement electrode 10 is provided in the measurement electrode 10 or in a cable or a connector for connecting the measurement electrode 10 to the device body 20, and a storage means 21 for recognizing the identification means of the measurement electrode 10 and storing information regarding the measurement electrode 10 is provided in the device body 20.

公开(公告)号：JPH1144672A

公开(公告)日：1999-02-16

申请号：JP20318797

申请日：1997-07-29

Applicant: TOA ELECTRONICS

Inventor： KONNO SO ,  KATO EIJI ,  TSUKADA YUICHI ,  HAKETA YASUSHI ,  WADA YUKIHIRO

IPC: G01N33/82 ,  G01N27/42

Abstract: PROBLEM TO BE SOLVED: To obtain an analytical method in which vitamin C can be quantitatively determined precisely by removing the effect of reducing organic substances even when the reducing organic substances other than the vitamin C exist in a sample liquid by a method wherein the sample liquid is brought into contact with a functional group which comprises a distribution capability or an adsorption capability. SOLUTION: In an analytical method for vitamin C by coulometery, a sample liquid which contains the vitamin C is supplied to a detecting cell in which a detecting electrode composed of a conductive porous body and a counter electrode are arranged via a diaphragm, and the vitamin C is quantitatively determined by an electrolytic operation. Then, the sample liquid is brought into contact with a substance into which a functional group comprising a distribution capability or an adsorption capability is introduced, and it is supplied to the detecting cell so as to be quantitatively determined. That is to say, the sample liquid is brought into contact with the substance into which the functional group comprising the distribution capability or the adsorption capability is introduced so as to be pretreated, and reducing organic substances, other than the vitamin C, which are contained in the sample liquid can be removed mostly. A result which is obtained by the chlorometry agrees well with the concentration of vitamin C measured by an indophenol titration method as an official method.