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What is qualitative filter paper?

2020-11-20 09:49:41
a

Laboratory equipment manufacturers talk about what qualitative filter paper is?

Qualitative filter paper When referring to "qualitative analysis filter paper", qualitative analysis filter paper is relative to quantitative analysis filter paper and chromatographic qualitative analysis filter paper.
Filter paper is a kind of paper with good filtering performance, which is loose and has strong liquid absorption performance. Analytical laboratories often use filter paper as a filter medium to separate solutions from solids. At present, the filter paper produced in my country mainly includes quantitative analysis filter paper.
Classification: qualitative analysis filter paper and chromatographic qualitative analysis filter paper.
1. Quantitative analysis filter paper: In the manufacturing process of quantitative analysis filter paper, the pulp is treated with hydrochloric acid and hydrofluoric acid, and washed with distilled water to remove most of the impurities in the paper fiber, so there is very little residual ash after burning, which is almost impossible for the analysis result. No effect, suitable for quantitative analysis.
At present, the quantitative analysis filter paper produced in China is divided into three categories: fast, medium and slow. The filter paper boxes are classified with white (fast), blue (medium) and red (slow) respectively. The shape of the filter paper is round and square. The specifications of the round paper are divided into d9cm, dllcm, d12.5cm, d15cm and d18cm according to the diameter. The square quantitative filter paper is 60cm×60cm and 30cm×30cm.
2. Qualitative analysis filter paper: Qualitative analysis filter paper generally has a lot of residual ash, which is only used for general qualitative analysis and for filtration of precipitate or suspension in solution, and cannot be used for quality analysis. The types and specifications of the qualitative analysis filter paper are basically the same as those of the quantitative analysis filter paper, which means fast, medium and slow, but are printed with the words fast, medium and slow. However, it should be noted that when the filter paper is not used for quantitative and qualitative analysis filter paper to filter the precipitate on the filter paper box:
①Natural filtration is generally used, and the liquid and solid are separated by using the filter paper body and the ability to retain solid particles:
②Due to the mechanical strength and toughness of the filter paper, the method of suction filtration should be used as little as possible. If the filtration speed needs to be accelerated, in order to prevent the filtration failure caused by filtration, when the air pump is filtration, it can be stacked 2 in the funnel according to the suction force. ~3 layers of filter paper, leaking when using vacuum filtration. First put a layer of dense filter cloth, and then put filter paper on it to filter;
③If possible, do not filter hot concentrated sulfuric acid or nitric acid solution.
3. Chromatographic qualitative analysis filter paper: Chromatographic qualitative analysis filter paper is mainly used as a support in the paper chromatography analysis method to carry out the qualitative separation of the analyte. For fast, medium and slow three.
The pore size of the qualitative filter paper is irregular. Usually, the pore size of the qualitative filter paper is large and the quantitative one is small. You can try using quantitative filter paper, the filtration speed is different, and the pore size is also different. Generally, the pore size of qualitative filter paper is large and there are no strict regulations. Quantitative filter paper is divided into three types: fast, medium and slow, and the pore sizes are about 80-120 microns, 30-50 microns, and 1-3 microns, respectively.

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