| 摘要 |
PURPOSE:To permit easy introduction of a small amt. of sample and adjustment of the flow rate of a tunnel gas and to improve S/N providing further a tunnel gas supply pipe into the carrrier gas pipe at the center of a Fussel type plasma torch to consist said torch of quadruple pipes. CONSTITUTION:A tunnel gas pipe 6 is further provided into a carrier gas pipe 1 of a tripple pipe torch of a Fussel type provided with the pipe 1, a gas pipe 2 for plasma, a cooling gas pipe 3 and a high-frequency coil 4 to consist said torch of the quadruple pipes. The sample soln. of a sample atomizer 7 is atomized by the flow of the carrier gas and is supplied into a plasma flame 5 through the pipe 1. The gas is supplied to the tunnel gas pipe to form surely the tunnel 8 of a low temp. in the central part of the plasma flame. The adjustment of the high-frequency electric power, the flow rates of the cooling gas, the gas for plasma and the carrier gas, etc. over a wide range is made possible by adjusting the flow rate of the tunnel gas by which the analysis with good S/N is made possible according to various cases. |
