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Do you know the precautions for using filter paper when filtering precipitates?

Release time :

Jul 01,2025

Source :

Filter paper serves as an effective filtration medium and has been widely adopted across various fields.

Do you know the precautions for using filter paper when filtering precipitates?

Filter paper serves as an effective filtration medium and has been widely adopted across various fields. Depending on the type of fibers composing the filter paper, its properties and applications differ. Options include standard filter paper for general use, glass fiber filter paper for high-temperature applications, and ultra-clean polypropylene filter paper, among others.

So, do you know the precautions for using filter paper when filtering precipitates? Let's analyze the following points:

The types and specifications of qualitative analysis filter paper are essentially the same as those for quantitative analysis filter paper, indicating fast, medium, and slow filtration rates. However, the filter paper boxes are labeled with “Fast,” “Medium,” and “Slow” instead of quantitative and qualitative analysis terms. When filtering precipitates with quantitative or qualitative analysis filter paper, note the following:

① Typically employ gravity filtration, leveraging the filter paper's structure and solid particle retention capacity to separate liquid from solids;

② Due to the relatively low mechanical strength and toughness of filter paper, minimize vacuum filtration whenever possible. If accelerated filtration is necessary to prevent filter failure from perforation, stack 2–3 layers of filter paper in the funnel based on suction strength during air pump filtration. For vacuum filtration, place a dense filter cloth layer beneath the filter paper in the funnel. ③ Avoid filtering hot concentrated sulfuric acid or nitric acid solutions with filter paper.

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