1. Quantitative analysis of filter paper Quantitative analysis filter paper in the manufacturing process, after hydrochloric acid and hydrofluoric acid treatment, and through distilled water washing. Most of the impurities in the paper fiber are removed, so the residual ash content after burning is very little, which has little influence on the analysis results. Suitable for precise quantitative analysis.
2. Qualitative analysis of filter paper The types and specifications of qualitative analysis filter paper are basically the same as quantitative analysis filter paper, indicating fast, medium, and slow speeds.
However, it is not necessary to use quantitative and qualitative analysis of the filter paper on the packaging box to filter the precipitation. It should be noted that natural filtration is generally used to separate the liquid from the solid by using filter paper and the ability to trap solid particles.
As a result, the mechanical strength and toughness of the filter paper are used as little as possible filtration method: if must speed up the filtration speed, in order to prevent filtration and lead to failure rate: in the air pump filtration, according to the size of the pumping force in the funnel put 2 ~ 3 layers of filter paper. When vacuuming, apply a dense press cloth and filter paper on top of it. Filter paper had better not filter hot concentrated sulfuric acid or nitric acid solution.
3. Qualitative analysis of filter paper by chromatography The qualitative analysis filter paper is mainly used as a carrier in the chromatographic analysis method for qualitative separation chromatography of the substance to be measured. There are two kinds of qualitative analysis filter papers of no. 1 and no. 3, and each type is divided into fast, medium, and slow. The qualitative filter paper aperture is irregular, usually qualitative filter paper pore is large, quantitative small.
What is the difference between a quantitative filter paper and a qualitative filter paper? Which instruments are applicable?
The difference between quantitative filter paper and qualitative filter paper mainly lies in the ash content after ashing: qualitative filter paper does not exceed 0.13%; Quantitative filter paper is not more than 0.0009%. Note that the concepts of quantitative filter paper and qualitative filter paper are unique to cellulose filter paper and do not apply to other types of paper such as glass microfiber filter paper.
The USES of quantitative filter paper and qualitative filter paper are as follows: qualitative filter paper is used for qualitative chemical analysis and phase separation; quantitative filter paper is used for quantitative analysis test by weight method and corresponding analysis test.
The choice of an appropriate filter paper can be made by considering the following four factors.
1.Hardness The filter paper will get wet when it is filtered. Some experimental steps of filtration for a long time should consider using filter paper which is stronger after wet water.
2. Filtration efficiency The density and size of porous holes in filter paper affect their filtration efficiency. The efficient filter paper filtration speed is fast and the resolution is high.
3. Capacity The solid particles accumulated during filtration can block the holes in the filter paper. Therefore, the dense the seepage hole is, the higher the capacity is, and the more filtering grain is allowed.
4. Applicability Some filter paper is made using special steps. In laboratory medicine, for example, a nitrogen-free filter must be used to determine the level of nitrogen in the blood.
In our past experiences, lab analytical filter paper is generally called Qualitative filter paper and Quantitative filter paper.
We make much research on Analytical filter papers, in the market, most people used to use Whatman, no doubt, Whatman in Analytical filter paper applications is the No. 1.
In the past recession, people are looking for economical filter paper that can replace Whatman, this is our company’s background for filter paper. We take this opportunity to conduct SGS testing and CE qualification to prove that Hawach filter paper is more competitive in price than Whatman filter paper.
For the price, here we can make two examples for you:
We believe Hawach is really a good supplier, not only supplying first-class quality products but also offering solutions for our partners, which is also been widely upheld and advocated since Hawach’s establishment. Competitive services are our eternal pursuit. After years of development, Hawach accumulated a lot of stable customers around the world and establish long-term business cooperation, we witnessed the growth and success of each other.
With our professional one-stop service and my rich sales experience can help your business grow bigger and bigger.