Графитовые кюветы
Графитовые кюветы из выскокоплотного графита, с пиропокрытием, с платформой
Описание
In graphite furnace technology, it is important to select the graphite tube according to the target element and sample composition. Actually there is a wide variety of different graphite tubes used in electrothermal atomization. Shimadzu´s atomic absorption spectrometers can be operated with different tube types: high density graphite tube, pyrolytic coating graphite tube, a “fork”- platform graphite tube and last not least the omega platform tube.
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| (1) High-densitiy Can be used for all elements. Especially effective for low-boiling point elements/low atomization temperatures (Cd, Pb, Na, K, Zn, MG, etc.) |
(2) Pyro-coated graphite tube
More resistant to acids than a conventional high densitiy tube. Effective for elements that end to form carbids (Ni, Fe, Cu, Ca, Ti, Si, V, Mo, etc.)
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(3) Platform tube
Restricts chemical interference due to coexisting substances. More matrix independent. Effective for the analysis of environmental samples and biosamples, such as sea water and industrial waste.
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(4) Omega-platform graphite tube
Superior platform tube design due to less contact area to the outer tube and equal distance to the outer tube. Superior characteristics compared to (3).
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Using platform tubes increases sensitivity
The outer tube is heated directly by high current (black).
Subsequently, the inner atmosphere is heated by radiation (blue).
Sample/atoms start to evaporate but can condensate because atmosphere temperature is too low, which means a loss of sensitivity.
The platform (orange/green) is heated less fast than the outer tube (black). As less contact area between tube and platform, as higher is the time delay. This enhances sensitivity.
Tubes Ordering Information
| Ref. | Description | Content | P/N | |
|---|---|---|---|---|
| #1 |
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High-density graphite tube | 1 pc. | 206-50587-12 |
| 10 pcs. | 206-50587-85 | |||
| #2 |
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Pyro-coated graphite tube | 1 pc. | 206-50588-11 |
| 10 pcs. | 206-50588-84 | |||
| #3 |
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Platform tube | 1 pc. | 206-50887-02 |
| #4 |
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Omega-platform tube | 1 pc. | 980-05340 |
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Starter Kit:
Graphite cap, Graphite holder,
4 tubes (Pyro-coated, High-density, Platform, Omega-platform)
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6 pcs. | 980-08855 |
Tube Holder / Cap Ordering Information
| Description | Content | P/N | |
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Graphite cap | 1 pc. | 206-50602RI |
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Graphite holder | 1 pc. | 206-50603RI |
