Standard solution refers to a reagent solution with an accurate known concentration, and titrators are commonly used in titration analysis. In other analytical methods, the standard solution is used to draw working curves or as a calculation standard. The following small edition of Bolinda to introduce you to the management points of standard solution preparation.

Key points of management of standard solution preparation:

1, accurately weigh (quantity) take the solute

For solid reagents, in accordance with the regulations, first fully dried, and cooled to room temperature immediately weighed for preparation, weighing, accurate weighing to 0.1mg. For liquid reagents, the required volume should be calculated according to the need and measured directly. The standard solution shall be prepared using A qualified Class A volumetric bottle.

2, the correct choice of solvent

The general principle of solvent selection is that the purity of the solvent should be roughly the same as the purity grade of the reagent. If necessary, the quality of the solvent should be tested, and if its purity does not meet the requirements, it should be treated to ensure the quality of the standard solution. 

3, control the quantity of preparation

The standard solution should be formulated according to its stability, concentration and demand. The standard solution with high concentration and good stability can be prepared for about one month at a time, and the standard solution with low concentration and poor stability should be prepared in small amounts. 

4. Do a good job of calibration

The concentration of the standard solution should be calibrated regularly, especially for the standard solution with unstable concentration, it is best to calibrate before each use to ensure accuracy.

The above content is the introduction of the main points of management of the preparation of standard solution, the personnel engaged in the preparation of standard solution need to hold the corresponding qualification certificate, the preparation of standard solution water, unless otherwise specified, all refer to purified water. Glass measuring instruments used in the preparation of standard solutions must be strictly calibrated, or with first-class burette, volumetric bottle and pipette capacity instruments.