Filter paper is a kind of good filtration performance, paper loose, the liquid has a strong absorption performance. The paper is used as filter media to isolate the solution from solid. At present, the paper mainly has quantitative analysis of filter papers, qualitative analysis of filter papers and chromatography of the three types of qualitative analysis filter paper. The two concepts of quantitative filter paper and qualitative filter paper are cellulose filter paper, and do not apply to other types of filter paper such as glass micro-fiber filter paper. Qualitative filter paper is used for qualitative chemical analysis and filtration separation. Qualitative filter paper is commonly used in filtration solution, do chloride, sulfate, etc. do not need to calculate the numerical test; Quantitative filter paper is used for precise calculation of numerical filtration, such as determination of residues, insoluble, and so on, the general quantitative filter paper, but also to enter the high temperature furnace for processing.
Chromatography qualitative analysis of filter paper chromatography with the analysis of the filter papers is mainly used as a load in the Chromatographic method, the qualitative separation of the materials to be measured by the chromatography qualitative analysis filter has 1th and 3rd, each of two, is divided into fast, medium speed and slow three. In addition: the difference between quantitative filter paper and qualitative filter is: Qualitative filter is used for qualitative chemical analysis and corresponding filtration separation; Quantitative filter paper is used in quantitative chemical analysis of gravimetric analysis and corresponding analysis test. The effect of quantitative filter paper is mainly used to filter the grey weighing analysis experiment, the ash weight of each filter paper is a definite value, and the qualitative filter is used for general filtration. The difference between quantitative and qualitative filter paper mainly lies in the amount of ash produced after ashing. The qualitative filter paper does not exceed 0.13%, the quantitative filter paper does not exceed equal to 0.0009%. Ash-Free filter paper it is a quantitative filter, its ash less than 0.1mg, this weight can be ignored in the analytical balance. Note that the two concepts of quantitative filter paper and qualitative filter paper are cellulose filter paper, not suitable for other types of filter paper such as glass fiber filter paper.