The stability and accuracy of the standard solution is the premise to ensure the quality of physical and chemical analysis, which is highly valued by various laboratories, and the validity period of the standard solution is also a very important one, so what are the requirements for the validity period of the standard solution? The following is a small edition of Bolinda to introduce you.

What are the requirements for the expiration date of the standard solution:

Elemental standard solution:

1, the element standard solution is generally prepared into a concentration of 100μg/mL standard reserve solution, stored in the refrigerator at 0~5℃, valid for 6 months.

2, diluted to 1μg/mL~10μg/mL or the appropriate concentration of the standard working curve, stored in 0~5℃ refrigerator, valid for 1 month.

Standard titration solution reference period:

1, standard titration solution stored at room temperature, valid for two months.

2, when the concentration of standard titration solution is less than or equal to 0.02mol/L, it should be diluted before use.

Standard solution for agricultural and veterinary drugs:

1. The standard solution for the detection of pesticide and veterinary drug residues is generally prepared into a standard reserve solution with a concentration of 0.5mgm/L~1mg/mL, which is stored in a refrigerator at 0 ° C and valid for 6 months.

2, Dilute into a concentration of 0.5μg/mL~0.5μg/mL or appropriate concentration of standard working liquid, stored in 0~5℃ refrigerator, valid for 2 to 3 weeks.

The above content is what is necessary for the validity period of the standard solution and the testing standards are generally not specified in detail, which brings some inconvenience to the management of the standard solution in the physical and chemical laboratory.