Capillary burette gravimetric titration method

Abstract

The invention belongs to the chemical analysis field and relates to a general and rapid mini type weighing titrimetry analysis method; the invention is characterized in that a common dull polish titrimetry device is substituted by the simplest and most cheapest capillary drip tube (the quality of drop liquid is 0.005-0.02g); a mechanical analysis scale is substituted by an electronic scale; the volume of a titrant solution is substituted by the quality of the titrant solution, and the contents of measured ingredients is calculated; the invention simplifies the device, lowers cost, is easy for operation and is in favor of the rapid capitation of a liquid reagent; the method in the invention is more convenient and more swift than the common weighing titration method and the general volume titration method. The key points of the method in the invention are as follows: a measured liquid in certain quality (or certain volume) is provided in a taper bottle (or a small beaker); the quality of the capillary drip tube is known, and the capillary drip tube absorbing a standard solution is used to drip the measured liquid (a magnetic force blender can be used); the quality of the capillary drip tube is weighed again when the capillary drip tube dripps at the end of the scale; the difference between the qualities of the capillary drip tube weighed at the two times is the quality of the consumed standard solution, according to which the contents of the measured ingredients can be calculated out.

Description

technical field [0001] The invention belongs to the field of chemical analysis, and relates to a micro weighing and titration analysis method, which is suitable for analysis items whose mass fraction of components to be measured is greater than 1%. Background technique [0002] Titration analysis was developed in the middle of the 18th century, and it includes two branches: weighing titration and volumetric titration: the initial invention of weighing titration analysis uses a balance to determine the quality of the solution and calculates the content of the analyte; The accuracy of this method is high, and the minimum measurement error can reach 0.03%. However, the operation of the mechanical weighted analytical balance and the special weighing and titration device is cumbersome and the measurement speed is slow. Currently, it is only used in the determination of reference substances or standard substances. The subsequent volumetric titration method uses glass volumetric ve...

AI Technical Summary

Problems solved by technology

The subsequent volumetric titration method uses glass volumetric vessels such as burettes to measure the volume of the solution, which greatly speeds up the titration analysis. Although the accuracy of this method is slightly reduced, the minimum error of determination is 0.1%, but it can meet the general determination requirements. requirements, and therefore soon dominated the titration analysis