Peristaltic pump type weighing titrator and titration method thereof

Abstract

The invention discloses an analytical chemistry instrument, in particular to a peristaltic pump type weighing titrator and a titration method thereof. The titrator comprises a titration unit, a measure and control unit and a weighing bottle. The titration unit comprises a titration tank, a peristaltic pump and capillaries, and an inlet and an outlet of the peristaltic pump are respectively communicated with the weighing bottle and the titration tank through the capillaries. An electrode is installed in the titration tank, an electric signal input end of the measure and control unit is connected with the electrode in the titration tank, and a control output end of the measure and control unit is connected with the peristaltic pump. The peristaltic pump type weighing titrator drives titrating solution through the peristaltic pump, determines titration progress through changes of electrode potentials measured by the measure and control unit, controls the peristaltic pump, acquires mass of the titrating solution through a weighing method, and accordingly improves titration accuracy. Simultaneously, the peristaltic pump type weighing titrator is simple in structure, convenient to use and low in cost, and a titration pipeline is small in volume, so that washing is facilitated.

Description

[0001] technical field [0002] The invention relates to an analytical chemical instrument, in particular to a peristaltic pump type weighing titrator and a titration method thereof. Background technique [0003] The titration analysis method is to add a reagent solution of known accurate concentration to the solution of the tested substance dropwise until the added reagent reacts stoichiometrically with the tested substance. According to the concentration of the reagent solution and the amount consumed , the method of calculating the content of the measured substance. At present, the automatic titrators on the market generally adopt the plunger titration method. By measuring the electrode potential change, the plunger automatic burette is controlled to add or stop adding the titrant. volume of. This is a method of volumetric analysis, but the defect of this method is that due to the limitation of the volume measurement accuracy of the burette and the influence of the dens...

AI Technical Summary

Problems solved by technology

This is a method of volumetric analysis, but the defect of this method is that due to the limitation of the volume measurement accuracy of the burette and the influence of the density of the aqueous solution with the temperature change, the titration repeatability of the volumetric analysis method can only reach 0.1%, and it cannot be applied to a higher level. Breakthrough in titration precision, meanwhile, the structure of plunger-type automatic burette is complicated, the processing precision is high, and the production cost is high

[0004] There are also some titrators that use a metering pump for titration. The titration precision of the metering pump is much worse than that of the plunger pump. There are few such titrators on the market.

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