A filter paper is a kind of filter tool commonly used in chemical laboratories, usually round in shape, which is made of cotton fiber that has numerous holes for liquid particles passing through. This property can separate the liquid from the solid.
Filter paper can be generally divided into qualitative and quantitative. The difference between quantitative filter paper and qualitative filter paper mainly lies in impurity content. Qualitative filter papers are used for qualitative chemical analysis and corresponding filtration separation; quantitative filter papers are used for gravimetric analysis and corresponding analysis in quantitative chemical analysis.
People should consider its hardness, filtration efficiency, capacity and applicability for selecting filter paper.
Hardness: Consider selecting a stronger filter paper for experiments need a long time.
Filtration efficiency: The high-efficiency filter paper has the advantages of fast filtration speed and high resolution.
Capacity: The denser the pores are, the higher the capacity.
Applicability: Some filter papers are made by special manufacturing steps. For example, nitrogen-free filter paper must be used for the determination of nitrogen content in blood in laboratory medicine.