Why Is Filter Paper Used in Chromatography?
HAWACH offers a full range of filter papers, membranes, filters, filtration systems, and laboratory consumables, providing leading filtration solutions for basic laboratories, in vitro diagnostics, environmental monitoring, quality testing, and control. The main component of filter paper is cotton fiber. The surface of the filter paper has many small holes that allow liquid particles to pass freely, while larger solid particles are kept out and thus cannot pass through the paper. Today HAWACH will introduce the role of filter paper, its classification, and some basic properties. Hawach provides Qualitative 20 Micron Filter Paper Grade: BIO-4, Quantitative Laboratory Filter Paper Grade: BIO-42, Quantitative Cellulose Filter Paper Grade: BIO-44, Wet Strengthened 10 Micron Filter Paper Grade: BIO-91, and other filter papers for your choice.
1. The main role of the filter paper – the role of chromatography.
The cotton fibers in filter paper have a good affinity with water. In most cases, paper chromatography is to use the combined water in the filter paper fibers as the stationary phase, while the mobile phase is based on organic solvents. As the mobile phase, the organic solvent, passes through the sample, it distributes the water and the organic phase, and then as the mobile phase continues to move, the various components are redistributed, further allowing the substances to be separated and purified. It’s mainly used in chemical laboratories.
2. The main classification of filter paper.
Filter papers can be divided into qualitative and quantitative filter papers. Qualitative filter paper is generally filtered and is only suitable for qualitative analysis. Quantitative filter paper must undergo special treatment procedures in the process of use, to a certain extent it can effectively resist certain chemical reactions, so the impurities generated on its surface will be much less, usually, it is generally used in quantitative analysis. The surface of quantitative filter paper is smooth, the gray is extremely low, the load capacity is strong, the filtering effect is good, and the granular intercepting effect is ideal. It is mainly used in the quantitative chemical analysis of the weight method and the corresponding analysis experiment.
When filtering the water samples, the ammonium nitrogen varied greatly and the water samples filtered through the quantitative filter paper contained more ammonium nitrogen than the water samples filtered through the qualitative filter paper. Try not to use qualitative filter paper for acidic and alkaline solutions, consider using a stainless steel filter.
In addition to the application of filter paper in chemical experiments, we also have the application of filter paper in our lives, in industry filter paper is generally used to adsorb suspended particles in the air.
3. The basic properties of filter paper.
The choice of suitable filter paper is determined by the following four factors.
(1) Hardness, the filter paper will be wet when filtering, so in the process of filtration for a long time, should choose a tougher filter paper
(2) Filtration efficiency, which is mainly determined by the tightness of the permeable pores and the size of the holes in the filter paper.
(3) Capacity, which is determined by the density of the permeable pores, the dense the pores, the higher the capacity.
(4) Suitability, some filter papers are made in very specific steps, so care must be taken in their application.
Highlights of HAWACH filter paper
HAWACH filter paper features large air permeability and high filtration accuracy. The material used in cotton fiber filter paper is ultra-fine fiber with a small pore size, which makes the filter paper can intercept as much dust as possible. HAWACH specially designed three filter papers with different flow velocities to meet the use of unusable users: fast, medium speed, and slow speed, and different models of filter paper whose physical and chemical indicators are different. There are different types of sizes and specifications, taking into account the filtering speed and granular interception effect. It is mainly used for the measurement of cement marks, environmental monitoring, and laboratory quantitative analysis in industrial production.
