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Precautions For The Use of Glass Droppers

Nov. 06, 2020

The Glass Dropper is a gauge used to accurately dispense the volume of a solution. A pipette is a measuring instrument that only measures the amount of solution it releases. It is a long thin glass tube with a large part in the middle. The lower end is a sharp beak, and a marking line is engraved on the upper neck, which indicates that the exact volume has been removed. Use a pipette to select the appropriate size according to the volume and requirements of the pipette. Pipettes are usually used to accurately remove solutions in titration analysis. When controlling the reaction, a pipette is usually used. So what is the correct way to use a glass dropper? The PET Drop Bottle Supplier summarized the areas to be aware of when using glass droppers.

A pipette is an instrument that can accurately remove a certain amount of solution. When using, hold the pipette with the thumb and middle finger of your right hand, insert the pipette into the solution container, and then extend the lower end of the test tube into the lower part of the solution. Hold the ear wash ball and remove air from your left hand, then align the tip of the ear wash ball with the pipette nozzle. Since the inside of the ball is under negative pressure, the left hand will relax when sucking the liquid, and the solution will rise along the pipette. When the liquid level slightly exceeds the scale, immediately press the upper pipette of the pipette with your right index finger and remove the pipette. container. Slightly loosen your index finger, and slowly rotate the test tube with your thumb and middle finger to allow the solution to flow out at the same time while keeping your sight at the same level as the pipette mark. When the liquid level is tangent to the graduation line, immediately press your index finger and insert the pipette into the flask. Press down on the lower end of the vertical pipette and the upper inner wall of the slightly inclined triangular bottle. At this point, release your index finger and quickly dissolve the solution. Flow out. After the solution flows out, stop it for about 15 seconds, and then complete the pipetting operation. The solution remaining on the pipette tip usually does not need to be blown out. Due to calibration, the retained volume of the tip is not included in the metered volume of the pipette.

Dropper Bottle

Dropper Bottle

In addition, pay attention to the following when using the Dropper Bottle:

1) The grasping method is to use the middle finger and ring finger to grasp the glass tube part to maintain stability, and use the thumb and index finger to pinch the rubber tip to control the inhalation or dripping of the reagent.

2) When adding liquid to the plastic pipette, it cannot reach or touch the container.

3) Cannot be placed upside down or placed on the table. Should be inserted into a clean bottle or test tube.

4) Rinse with water immediately after use. Do not take other reagents without washing.

5) The rubber cover and glass dropper should be tightly combined and sealed. If the rubber cover is aging, it should be replaced in time.

The most error-prone thing is to put the plastic dropper into the test tube mouth. Another thing to note is that the plastic dropper should be kept vertical when adding reagents to the test tube.

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