Analysis balance introduction, definition and classification

Introduction to analytical balances

Analytical balance is the most important and commonly used precision weighing instrument in quantitative analysis. Its weighing accuracy has a great influence on the analysis results. Therefore, you must master the correct use of analytical balances, and correct and verify analytical balances as required.

There are two types of analytical balances: mechanical balances and electronic balances. The mechanical balance is composed of the principle of leverage. The principle of electromagnetic force balance is used. The electronic balance is directly displayed with mass readings.

Analytical balances are used for the weighing of test articles and reference substances in the determination of content and the calibration of titrants.

There are three kinds of analytical balances used in the pharmaceutical analysis laboratory: 0.1mg, 0.01mg and 0.001mg.

When the sampling volume is greater than 100mg, select an analytical balance with a sense of 0.1mg;

When the sampling volume is l00 ~ 10mg, select an analytical balance with a sense of 0.01mg;

When the sampling volume is less than 10 mg, use an analytical balance with a sensitivity of 0.001 mg.

There are two methods of weighing with an analytical balance: the decrement method and the increment method.

When weighing by weight reduction method, first put the test product in the weighing bottle, place it on the balance pan, and weigh the weight as W1. Then take out the required amount of test product, and then weigh the remaining test product and The weighing bottle is W2, and the difference between the two weighings, namely W1-W2, is the weight of the test product. Weighing using the method of weight reduction can continuously weigh several test samples, saving weighing time.

When using the incremental method of weighing, first put the container on the balance pan and weigh it as W1, then add the test sample to the container, and then weigh it as W2, the difference between the two weights W2-W1 is The weight of the test product. Need to weigh a certain amount of test products, often using the incremental method.

Analytical balances should be regularly verified in accordance with the regulations of the metrology department, and should be kept by a special person responsible for maintenance.

Definition and classification

There are three kinds of analytical balances used in the pharmaceutical analysis laboratory: 0.1mg, 0.01mg and 0.001mg.

When the sampling medical education network collects and organizes more than 100mg, select an analytical balance with a sense of 0.1mg;

When the sampling volume is l00 ~ 10mg, select an analytical balance with a sense of 0.01mg;

When the sampling volume is less than 10 mg, use an analytical balance with a sensitivity of 0.001 mg.

Rules and regulations of the balance room

1. The operator wears work clothes when working, cleans up the post hygiene before and after work, and keeps the balance, operation platform, ground, doors and windows clean.

2. The operator should be familiar with the principle, structure and correct use of the analytical balance to avoid weighing accuracy or damaging certain components of the balance due to improper use and improper storage.

3. The sensitivity of the analytical balance used should reach 0.1 mg (or 0.01 mg), and its accuracy level should not be lower than level 4 (or level 3). The metrology department of the city shall calibrate and measure once a year. No one is allowed to disassemble or disassemble its components or change its sensitivity at will. If any abnormality is found, it shall be reported to the Quality Assurance Department in a timely manner, and a record shall be made.

4. Persons who have nothing to do with this room are not allowed to enter casually, let alone operate and use the balance at will.

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