Titration device

Abstract

PROBLEM TO BE SOLVED: To provide a titrator capable of preventing, with a simple structure, failure that properties of a reagent solution held in a titration reagent introducing tube waiting for titration are changed through oxidation or the like. SOLUTION: A reagent introducing mechanism 3 comprises: a titration reagent introducing tube 34 inserted into a sample vessel 11 and having a tip 341 thereof disposed at a lower level than a liquid level of a sample solution retained in the sample vessel 11; and a reagent pumping part 35 for discharging or sucking a reagent solution held in the titration reagent introducing tube 34. A control device 5 controls a solution discharging mechanism 4 to cause the solution to be discharged from the sample vessel 11, and then causes the reagent pumping part 35 to perform a sucking operation so that an air layer 342 is formed in the titration reagent introducing tube 34 by a prescribed length from the tip 341.

Description

technical field [0001] The present invention relates to a titration device for performing various titrations such as redox titration and neutralization titration. Background technique [0002] In the case of measuring COD (Chemical Oxygen Demand), which is one of the indicators of water pollution, oxidize the organic matter in the sample solution with potassium permanganate, stop the oxidation with excess sodium oxalate, and then use high Potassium manganate is back titrated to measure the amount of potassium permanganate required for oxidation. [0003] The COD automatic measuring device for automatically performing the titration at least includes: a sample solution introduction mechanism, which imports the sample solution into the sample container; a reagent solution introduction mechanism, which imports the reagent used for titration; a liquid discharge mechanism, which discharges the sample solution after the measurement liquid in the sample container; and a control dev...

AI Technical Summary

Problems solved by technology

However, as shown in Patent Document 2, since the injection capacity of the syringe for titration is small, it is impossible to discharge all the reagent solution inside the reagent solution introduction tube for titration, so an air pump must be provided separately, and the piping will become complicated, resulting in The structure of the titration device becomes complicated

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