Quantitative filter papers are designed for quantitative analysis and are used to collect and measure particulate matter. They are made of high-quality alpha-cellulose fibers, which are almost free from ash content. They have a low ash content, which makes them ideal for gravimetric analysis. These papers have a very fine pore size that allows them to retain particles with a diameter of fewer than 2 microns. Quantitative filter papers are commonly used in applications such as air pollution monitoring, wastewater analysis, and soil analysis.
Qualitative filter papers, on the other hand, are designed for general qualitative analysis and are used to separate precipitates from liquids. They are made of a mixture of cellulose and lignin fibers, which gives them a higher ash content than quantitative filter papers. They have a relatively larger pore size than quantitative filter papers, allowing them to retain larger particles, with a diameter greater than 8 microns. Qualitative filter papers are commonly used in applications such as food and beverage analysis, blood analysis, and pharmaceutical analysis. Qualitative filter paper is also commonly used to clean the test bench and various equipment tools in the cleaning and wiping laboratory.
Qualitative filter paper is divided into fast, medium, and slow speeds. Fast moisture breakage ≥120, the separation performance of iron hydroxide, high loading, suitable for filtration of coarse particles, medium, and gelatinous precipitates. The medium-speed moisture breakage is ≥140, the separation performance is lead sulfate, medium separation performance, medium filtration speed, liquid filtration covering most laboratory applications, and medium-speed filter paper is often used in industrial filtration. The slow moisture-resistant breaking degree is ≥180, and the separation performance is barium sulfate (heat). The retention ability is strong, the adsorption effect is obvious, and the particles can be intercepted to a large extent, which takes a long time.
Qualitative vs Quantitative Filter Paper. In summary, the main differences between quantitative and qualitative filter papers are their composition, pore size, and filtration properties. Quantitative filter papers are made of high-quality alpha-cellulose fibers, have a low ash content, and have a very fine pore size that allows them to retain particles with a diameter of fewer than 2 microns. Qualitative filter papers are made of a mixture of cellulose and lignin fibers, have a higher ash content, and have a relatively larger pore size that allows them to retain particles with a diameter greater than 8 microns. Qualitative filter paper is used for qualitative chemical analysis and corresponding filtration separation; quantitative filter paper is used for gravimetric analysis tests and corresponding analytical tests in quantitative chemical analysis.
The function of the quantitative filter paper is mainly used for the ashing weighing analysis experiment after filtration. The ash weight of each filter paper after ashing is a fixed value.
The qualitative filter paper is used for general qualitative analysis and filtration of precipitates and suspensions in solution. While the amount of ash generated after ashing differs from the quantitative and qualitative filter paper. The qualitative filter paper does not exceed 0.13%, and the quantitative filter paper does not exceed 0.0009%.
Quantitative vs qualitative filter paper. Ashless filter paper is a quantitative filter paper with an ash content of less than 0.1 mg, which is negligible on the analytical balance. Because the qualitative filter paper’s pulp is treated with hydrochloric acid and hydrofluoric acid and washed with distilled water to remove most of the impurities in the paper fibers.
