New method of pipetting instead of measuring cylinder
In many experiments, we not only require fast and efficient pipetting to improve work efficiency, but also require precise pipetting to ensure the accuracy of the results.
Higher accuracy
In most organic synthesis experiments, measuring cylinders are often used to remove solutions. Brand bottle dispensers are much more accurate than measuring cylinders.
Brand bottle dispensers are divided into digital, vernier and fixed volume display formats. Since the manual reading and volume adjustment process is omitted during the pipetting process, the pipette operation of the bottle dispenser is greatly reduced Errors caused by human factors. This is very practical in many analysis and synthesis laboratories. Because, in fact, many experimenters do not master the standard volumetric operation of glass containers, such as measuring cylinders and pipettes.
Practical and convenient
Correctly and strictly read the concave liquid surface of the transparent glass container:
1. Take a dark blue card as the background and place it on the liquid level of the graduated cylinder or pipette
2. Slowly move the blue card down
3. Until the concave liquid surface of the solution is seen, the concave liquid surface seen at this time is the real concave liquid surface, but many people often do not use the dark blue background card, but simply rely on the eyes to quantify. The pseudo concave liquid surface in the above figure, plus the error caused by the lowest concave liquid surface not being flush with the line of sight (as shown below), the final result is far greater than the error range marked by the measuring cylinder or pipette. The bottle dispenser does not need to consider these at all. After the digital or cursor fixed range, you can quickly dispense by simply pulling up.
Bubble removal: improve accuracy and save solution
There is a common problem for all piston pipetting tools, that is, more or less bubbles will be generated during the piston pipetting process, and the bubbles will greatly affect the accuracy of the dispenser. Under normal circumstances, we have repeatedly sucked and discharged to achieve air bubbles, this time will cause a part of the waste of solution, this part of the waste of some expensive reagents can not be ignored.
Brand's solution to this problem is to install a safety valve for the distributor. The safety valve can realize the backflow in the solution, so as to return the bubble-drained solution back to the reagent bottle, which not only eliminates the error caused by the bubble, but also avoids the waste and pollution problems caused by it, and it serves two purposes.
Simple calibration
Brand bottle dispensers have the advantage of easy calibration. Many volume tools require regular calibration and maintenance, and bottle dispensers are no exception. The frequency of calibration depends on the frequency of use, and is generally calibrated every six months. This reduces the error to a certain extent and provides accuracy. However, glass and plastic measuring tools generally cannot be recalibrated to restore accuracy. In the long-term use, it is common for the scale lines to be blurred or even invisible due to wear and corrosion of the solution.
The brand bottle dispenser has a simple calibration function that requires no tools and is completed in less than 30 seconds.
I believe that many people are still accustomed to using glass measuring tools and containers. They think that glass measuring tools are cheap, easy to clean, and resistant to corrosion, but have you ever noticed that glass containers are caused by corrosion during long-term use, cleaning, soaking, and storage The error?
for example:
Volume: 10 ml, error limit: ± 0.05 ml pipette, scale length = 178.32 mm, inner diameter = 8.450 mm.
At 70 ° C, the rate of 1M NaOH eroding the glass is 0.14 μm / h. After 80 h, the inner diameter increases to 8.472 mm, and the new volume is 10.05 ml
result:
After 80 h, the volume of the pipette increased by 0.05 ml! What about the error?
Brand bottle dispenser is a new pipetting tool that can completely replace the measuring cylinder. It has higher accuracy, convenience and practicality, and has been used and loved by more and more laboratory workers.
A new experience in pipetting, please come to the Kingdom of Brand Pipetting!
Organic synthesis laboratory, biological laboratory, analytical chemistry laboratory − total solution for pipetting
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