graduated pipette的意思|示意

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Graduated pipettes are laboratory instruments used for accurate measurement of volumes of liquid. They are calibrated for accuracy, and are typically made of plastic or glass. They have a long, narrow tube with a stopcock at one end, and a bulb or a suction device at the other end.

The stopcock is used to ensure that only the amount of liquid prescribed is dispensed. This is done by opening and closing the stopcock at the desired volume.

The bulb or suction device is used to draw liquid into the pipette. For best accuracy, this should be done slowly and gently. Once the liquid has been drawn into the pipette, it is expelled slowly and carefully, making sure not to draw in more than the prescribed amount.

Once the pipette is filled to the desired volume, the stopcock should be closed immediately. This prevents any remaining fluid from dripping out of the pipette. Graduated pipettes are used for a variety of laboratory applications, including performing titrations and measuring liquid samples for analysis. They can also be used for measuring out small volumes for micro-scale experiments.

When using a graduated pipette, it is important to always wear gloves and protective glasses, and to ensure that the pipette is properly sterilized. In addition, it is important to carefully read and follow the instructions accompanying the pipette, as this will ensure accuracy and safety.