| 摘要 |
PURPOSE:To prevent the drop of a plasma temp. by inserting a sample introducing bar which is disposed with a sample receiving tray at the top end and a sample heating heater in the lower part of the receiving tray, respectively, into a plasma torch from the lower side thereof in such a manner that said bar can be inserted into and removed from the torch and can be vertically moved. CONSTITUTION:The plasma torch P is constituted of triple pipes; a central pipe 1 for a carrier gas, an intermediate pipe 2 for supplying a gas for forming a plasma flame and a sleeve pipe 3 for supplying a cooling gas. A high-frequency coil 4 for forming the plasma flame 5 is disposed on the outside of the pipe 3. The sample introducing bar 6 provided with the sample receiving tray 7 at the top end is vertically movably inserted into the pipe 1. The bar 6, in the receiving tray 7 of which a sample soln. is dropped, is then inserted into the pipe 1 and the sample is evaporated by a heater 8. The vapor thereof is entrained in the carrier gas and is introduced into the plasma flame 5 so that the sample emits light. Observation of the progress of the sample evaporation with time is thereby permitted without decreasing the plasma temp. and without disturbing the evaporation with time.
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