Use a syringe filter to filter things

Date:2021-09-23 16:42:55 Thursday

Summary:Use a syringe filter to filter things. Sometimes the pressure is too strong and the solution will spill out　The syringe filter is widely used in laboratories. It does not require membrane replacement and filter cleaning, which saves complicated and t......

Use a syringe filter to filter things. Sometimes the pressure is too strong and the solution will spill out
　The syringe filter is widely used in laboratories. It does not require membrane replacement and filter cleaning, which saves complicated and time-consuming preparation work. It is mainly used for sample prefiltration, clarification and removal of particles, liquid and gas sterilization filtration. It is the preferred method for filtering small samples of HPLC and GC. The needle filter housing is made of polycarbonate plastic, and the upper and lower parts are welded together by ultrasonic, which is resistant to high pressure and does not have the problem of product leakage.
The PTFE syringe filter contains a hydrophobic PTFE membrane and is an effective filter for solvents, chemicals and other non-aqueous solutions. The PTFE membrane and the sturdy polypropylene housing are particularly suitable for filtering corrosive chemicals.
　　I use a syringe filter to filter things. Sometimes the pressure is too strong and the solution will spill out, and there is almost no liquid when the pressure is weak. There is no way to change a filter with a larger pore size. Are there any good suggestions? There is also a vacuum pump that sucks and sucks the liquid and slowly seeps down along the interface.

Is there a good way?
　　 1. The solid funnel can be stuffed with cotton, but it’s a bit slow
　　 2. Can I filter with filter paper first and then use the filter? Use inert gas to protect if necessary.
　　3. Filter out the big ones first, and then put the needle on, otherwise it may be blocked
　　 4. When molecular experiments were done before, when the purpose was to sterilize, it could only be done once.
　　 5. Do it once, you have to throw it away after you use it
　　6. It can be cleaned and reused, but if it is difficult to filter, don't use it again
　　7. If the water sample is relatively clean, it can be reused. Rinse it with water after use. Replace it when the resistance is high during sample injection.
　　 8. It can still be used when the filtering effect can be achieved without cross-contamination
　　9. In principle, disposable filter heads are not allowed to be reused. If you feel wasted, you'd better buy a filter membrane and a large filter head. The filter membrane needs to be replaced after it is used, and the filter head needs to be cleaned after use. Note that the material of the inorganic filter is different from that of my organic filter, so you need to pay attention to it when you buy it.