Factors to consider when selecting a sample filter

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The main function of the sample filter is to remove particles, bacteria and other impurities from the gas phase or liquid phase for separation, purification and purification purposes. Therefore, there are several factors to consider when choosing a sample filter:

1. Material of the sample filter (chemical compatibility): When selecting a sample filter syringes filters china, first consider the chemical compatibility. Whether the filter is resistant to acids, alkalis, organic solvents, etc.

2. Sample filter pore size: For column systems using 3 μm or larger particle size packing, the enzyme-linked immunoassay kit can use a 0.45 μm sample filter; for chromatographic systems that make less than 3 μm packing, or involve microbial growth For chromatographic systems, a 0.2 μm sample filter is recommended. For turbid turbid solutions, a 1-5 um sample filter can be used for pre-filtration and then filtered with the corresponding filter.

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3. Characteristics of the sample:

1) Hydrophilic sample: A hydrophilic membrane is used syringes filters china. It has an affinity for water and is suitable for filtering water as a matrix solution. Useful membranes are: mixed cellulose esters, polyethersulfone (PEs), Nylon, and the like.

2) Strong corrosive organic solvent: a hydrophobic film is generally used. Sample filters such as polytetrafluoroethylene (PTFE), polypropylene (PP), etc.

3) Protein solution: Select a low protein adsorption sample filter, such as a polyvinylidene fluoride membrane (PVDF).

4) Ion Chromatography: Polyethersulfone (PEs) sample filters are generally considered to be suitable for filtration of solutions with low inorganic ions.

4. When selecting a sample filter, in addition to considering the above factors, consider the volume of the sample (ie, what size of the sample filter is selected): Usually, when the sample amount is less than 2 ml, a 4 mm diameter micro filter is used. The sample volume is between 2-10ml, and a 13mm diameter filter head is used syringes filters china; when the sample amount is more than 10ml, a 25mm diameter filter head is selected.

This is the end of the introduction of Factors to consider when selecting a sample filter. I hope it can help you.