A reference substance is a substance or material that has been determined to have one or more sufficiently uniform characteristic values, and is used as a "measuring tool" in the analytical measurement industry to calibrate measuring instruments and devices, evaluate measurement analysis methods, measure the characteristic values of substances or materials, and assess the operational skills of analysts. As well as in the production process of product quality control and other fields play an indispensable role. So what should we pay attention to during the dilution and use of standard substances for calibration? The following is a small edition of Bolinda to introduce you.

The standard substances purchased by the user for calibration are often of high concentration and cannot be used directly, so the quality control of these processes should be done. The containers and diluents used in the preparation of reference material dilution require attention.

When some substances are stored in glass bottles, they are susceptible to degradation or dissolution, and then bottles of other materials, such as K, Na and other elemental solution standard substances, need to be stored in plastic bottles; Some substances stored in plastic bottles will be adsorbed or dissolved, such as mercury, which may be adsorbed in plastic bottles, so the choice of glass bottles is more reliable.

In addition to the necessary control of the blank, the stability effect of different diluents is also different, and in principle, the diluent variety and concentration specified in the testing standard method should be formulated.

The measuring instruments used in the weighing and dilution process of standard substances, such as balances, pipettes, volumetric bottles, etc., should be properly calibrated or verified to meet the accuracy and accuracy requirements, especially the errors of micro-syringes and pipettes used in organic analysis are large, and attention should be paid to daily calibration.

The above content is the introduction of what problems should be paid attention to in the dilution and use of the standard material for calibration. In addition, the primary standard material is mainly used for calibration of the standard material lower than it, calibration of high accuracy measuring instruments, research and evaluation standard methods; Secondary standard substances are mainly used to meet some general testing and analysis needs, as well as the general requirements of the social industry, as working standard substances are directly used for field method research and evaluation, and for daily analysis and measurement with lower requirements.