Automatic titration device for analysis instrument

Abstract

The invention discloses a small automatic titration device applied to an analysis instrument. The automatic titration device comprises a titration pool of which the bottom is provided with a unique liquid inlet and outlet opening, an electromagnetic stirring mechanism with a central through hole, an inlet and outlet liquid metering system, a fastening mechanism, a titration endpoint monitoring device and a control and calculation unit. The device can be applied to photometric titration and potentiometric titration, is easy to install and has relatively low cost. The invention also provides a method for titrating by using the automatic titration device and calculating the volume of consumed titrated liquid.

Description

Technical field [0001] The invention relates to a titration device of an analytical instrument, in particular to an automatic titration device. Background technique [0002] Titration is a method of adding a standard solution to the analyzed solution gradually, and determining the reaction end point and analyzing the composition of the solution based on the color, precipitation or conductivity changes caused by the test component, titrant, and reaction product during the titration process. . According to different principles for determining the end point of titration, titration can be divided into photometric titration, potentiometric titration, coulometric titration, etc.; according to different reaction principles, it can be divided into acid-base, redox, precipitation or complexometric titration. [0003] A fully automatic titration device usually includes a titration cell, a liquid inlet and discharge metering system, a mixing and homogenizing device, a titration endpoint dete...

AI Technical Summary

Problems solved by technology

[0007] 1. There are too many pipeline connections in the titration tank, which not only increases the number and cost of valves and pumps required for the liquid inlet and discharge system, but also greatly increases the probability of leakage, and also increases the complexity of the installation of the titration tank

[0008] 2. Due to the complexity of the liquid inlet and discharge system, the process of liquid inlet, liquid discharge and titration is complicated

[0009] 3. Since the titration tank is designed with a flat bottom, it is easy to leave waste liquid. In order to ensure the accuracy of the next measurement, it is necessary to consume more clean water to clean the titration tank

Since the cylindrical stirrer is only constrained by magnetic force, when the device is working in a bumpy state such as a ship or a vehicle, the stirrer is easily thrown away from the working position, resulting in stirring failure or damage to the devices in the titration cell

[0011] 5. In the known design where the pipelines are connected from the upper part or the side of the titration tank, because various pipelines occupy the space on the upper part or the side of the titration tank, it is easy to interfere with titration endpoint detection devices such as photometers and electrodes, so This design increases the difficulty of instrument miniaturization

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