APPARATUS FOR PRODUCING SAMPLE VAPOR FOR TRANSFERRAL INTO AN INDUCTIVELY COUPLED PLASMA

摘要

A graphite tube for electrothermal vaporization of a sample to be investigated is held between annular contacts through which a flow can be passed lengthwise through the graphite tube. The contacts surround the graphite tube in a shell-like manner; a protective gas flow can thus be passed into a cavity which is formed between the graphite tube and the contacts. The contacts are retained in cooling blocks. The sample is introduced into the graphite tube, vaporized, and carried into the plasma by means of a carrier gas flow which is passed through the longitudinal bore of the graphite tube. The graphite tube contains a radial sample infeed opening which can be closed by a controllable closure member applied to the graphite tube.