Automatic titration apparatus for analytical instrument

Abstract

The invention provides an automatic titration apparatus for an analytical instrument. The automatic titration apparatus comprises an electromagnetic stirring device, a feeding and discharging liquid metering system, a fastening mechanism, a titration end point monitoring device and a controlling and calculating unit, wherein the electromagnetic stirring device has only one liquid feeding and discharging opening in the bottom and is provided with a central through hole. The apparatus can be used for photometric titration and potentiometric titration, and is simple to install and low in cost.

Description

technical field [0001] The application relates to a titration device for an analytical instrument, in particular to an automatic titration device. Background technique [0002] Titration is a method of adding the standard solution to the analyzed solution gradually, and determining the reaction end point by the color, precipitation or conductivity change caused by the component to be tested, titrant, and reaction product during the titration process, and analyzing the composition of the solution. . According to different principles of titration end point determination, 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, etc. [0003] A fully automatic titration device usually includes a titration tank, an inlet and outlet metering system, a mixing and homogenizing device, a titration end point...

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Problems solved by technology

[0007] 1. There are too many pipe connections in the titration tank, which not only increases the number and cost of valves and pumps required for the liquid inlet and discharge metering 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 metering system for liquid inlet and discharge, 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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