Platform cuvettes

Platform Cuvettes. The concept of platform atomization was first described by L vov in 1978. A platform is a thin rectangular piece of pyrolytic graphite. The platform is positioned within a conventional graphite cuvette as shown in Figure 47. Samples are injected on the platform. Contact... 

Figure 68 Peak shapes of As (1 mgl obtained by (A) pyrolytic, (B) conventional, and (C) platform cuvettes (Unicam Analytical Systems Ltd.)...

A series of additional alterations of the graphite tube atomizer intended to improve performance (e.g. the cup and cup cuvette atomizer, boat and microboat platforms, carbon rods, graphite probes, ring chambers and surface atomizers) have also been reported [23]. Interested readers are referred to specific sources [2-7] for more details. 

Stabilized Temperature Platform Furnace. The conditions in a Massmann furnace are by no means optimum during atomization. The sample is dispensed onto a cold wall of the tube which is then heated rapidly for atomization. After vaporization the sample is in an environment that is not in equilibrium with respect to volume or time. This can cause chemical interferences. Fewer interferences would occur in a continuously heated, isothermal furnace. It has been shown that about 60% of the atoms formed diffuse to the cooler cuvette ends and condense. In addition, at 2800 K a temperature gradient of 1000 K between the middle and the ends of a... 

Platform Atomization. A platform is a thin, rectangular shaped piece of graphite (normally prepared from pyrolytic graphite), which is mounted inside the conventional graphite tube. The platform is positioned in the centre of the cuvette. The platform is heated by cuvette wall radiation since it fits into a slot in the wall of the graphite cuvette and therefore does not come into direct contact with the hot centre portion of the tube. 

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