Graphite Tube For GFAAS

Graphite Tube For GFAAS

A graphite tube is a hollow cylinder made of carbon. It is used in a variety of applications including industrial and environmental analysis. Graphite tubes are available in a range of dimensions and materials. They can be customized to fit specific laboratory needs. They are resistant to corrosion and other chemical reactions that could degrade metals. They also have low melting points and are heat-resistant. They can be made from natural or synthetic graphite.

Graphite tube is an important component of the graphite furnace assembly for atomic absorption spectrometry (GFAAS). The graphite furnace assembly is used to determine trace levels of elements in liquid or solid samples at ppb level concentrations and below. This technique allows for high precision and reliability of results at these concentration levels. Preventive maintenance of the graphite furnace assembly is important to ensure the integrity of reported results. This includes visual inspection of the graphite tube for cracks, deformations, pitting and deposits around the injection hole. If any of these are observed the best option is to replace the tube as soon as possible. The supply of argon gas should also be inspected daily to ensure adequate pressure is being supplied.

The graphite tube in a GFAAS is the heart of the system and is responsible for vaporizing the sample into a gaseous state. The atomized sample is then measured by an atomic absorption spectrometer. This analyzer is a popular method for determining trace levels of elements. This method can detect contaminants that would otherwise cause false positive or negative results. It also eliminates the need for a separate elemental analysis.

There are several types of graphite tubes that are used in electrothermal atomization. They include a high density graphite tube, a pyrolytic coated graphite tube and a platform tube. The pyrolytic coating of the graphite tube restricts carbide formation, allowing for a better response and greater sensitivity than uncoated tubes. It is particularly effective for elements that tend to react with the carbon and form carbides. This is especially true for nickel, calcium, titanium, vanadium and molybdenum.

Resin bonded graphite tubes are produced from a mixture of graphite powder, resins and lubricants. This mix is extruded to produce a tube with 8-10% porosity. It is a less expensive alternative to the fully graphitized tube and can be used in harsh environments. It is a good choice for hydrochloric acid, chlor-alkali and chlorine applications.

A carbon bonded graphite tube is an impervious tubing with a graphite/carbon composite structure. It is manufactured from a combination of graphite flour, phenolic resin bake/treat and a thermally stable lubricant. This type of tube has an advantage over the resin bonded graphite due to its increased strength, durability and resistance to thermal shock. It is used in the chemical, pharmaceutical, metallurgical, electroplating, paper and printing industries.

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