Filter Paper Introduction
The role of filter paper
Because the cotton fiber in the filter paper has a good affinity with water, it can absorb about 22% of water, and the water combined with cellulose in the form of hydrogen bonds is 6% to 7%. In general, it is very difficult to remove. Compared with the affinity for water, the cotton fiber in the filter paper has a weaker affinity with the organic solvent, so in most cases, the paper chromatography method is in the filter paper fiber. Combined with water as the stationary phase, the mobile phase is dominated by organic solvents. When the mobile phase of the organic solvent passes through the sample, the water and the organic phase are continuously distributed, and as the mobile phase moves, the components of the various components are continuously redistributed, further separating the material. And purification. This use of filter paper is generally common in chemical laboratories.
Filter paper classification
In general, filter paper can be divided into two types, one is qualitative and the other is quantitative. Qualitative filter paper generally refers to the formation of cotton fibers on the surface after filtration, which is generally only suitable for qualitative analysis. The quantitative filter paper is generally for the ashless filter paper, and must be subjected to special treatment procedures during use. To a certain extent, it can effectively resist certain chemical reactions, so impurities formed on its surface. There will be a lot less, and in general it is generally used in quantitative analysis. In addition to the application of filter paper in chemical experiments, there are also applications of filter paper in our lives. For example, coffee filter paper is one of the widely used ones. Generally, this filter paper has high softness, while industrial filter paper Generally used to adsorb suspended particles in the air.