Graphite is an important allotrope of carbon element that we have learned in high school chemistry textbooks.East West Analysis Graphite TubeIt is a material made from graphite for production and experimentation. High purity graphite tubes are graphite tubes with a content greater than 99.9%, and are of relatively good quality among graphite tubes. Now, let's briefly understand the main process characteristics of analyzing graphite tubes.
Dense crystalline state
The graphite tubes referred to as block shaped graphite tubes in the industry are dense crystalline graphite tubes. Its main structural feature is a relatively dense crystalline structure. This type of graphite tube has good stability, is very tight, relatively strong, and high grade, but its plasticity and smoothness are not very good, mainly due to its dense structure.
Flake graphite tube
The graphite crystals of flake graphite tubes are different from those of dense crystalline graphite tubes, and their crystals appear as flake like as their name suggests. Although the taste of this graphite tube is not very high, it has excellent plasticity and surface lubricity.
Cryptocrystalline graphite tube
In addition to the above two types, there is another common type of graphite tube that is cryptocrystalline. The diameter of this graphite tube crystal is very small, the surface of the graphite tube lacks luster, and the lubrication performance is also relatively poor. However, the advantage is that it has a relatively high taste, so its application is still very wide.
High purity graphite tubes are all artificially processed graphite tubes with high taste, which are very useful materials for our industrial production, especially in the field of experimental research.
Classification of graphite tubes for east-west analysis:
1. Classified by heating method: longitudinal heating graphite tube, transverse heating graphite tube
2. Classified by performance: Ordinary graphite tubes (non pyrolytic) are suitable for low-temperature (≤ 2000 ℃) atomization of elements such as silver, cadmium, and lead; Pyrolytic graphite tubes are suitable for atomizing elements at low, medium, and high temperatures (>2500 ℃); The platform graphite tube is suitable for atomizing elements at medium and low temperatures (≤ 2400 ℃).
The series of atomic absorption graphite atomizers have the characteristics of high sensitivity and long service life. In the spirit of localizing imported instrument accessories, we have been developing graphite tubes using graphite materials since 1979 to replace imported graphite tubes.
Based on years of experimental research results, graphite tubes developed using high-purity, high-density, and high-strength graphite materials have basically the same testing performance indicators as imported foreign graphite tubes of the same type. Among them, sensitivity and service life are even better than imported graphite tubes.