INDUCTION COUPLING PLASMA MASS AND SPECTRAL ANALYSIS DEVICE

PROBLEM TO BE SOLVED: To preclude the possibility of mesh-clogging of the torch tip and a sampling cone by carbon C in a sample and a burst of a chamber even if oxygen gas of a quantity necessary to restrain sensitivity reduction is flowed, prevent mesh-clogging, and perform high sensitivity measurement by arranging a branch pipe in the inmost pipe of a torch, and introducing flow rate- controllable oxygen gas from its branch pipe. SOLUTION: When oxygen gas is supplied from an oxygen gas supply part 20, the oxygen gas is supplied from a branch pipe 22 arranged in the inmost pipe 5 of a torch 4 by passing through an oxygen gas supply pipe 19, and is mixed with a sample 18 by the inmost pipe 5. A flow rate of a nebulizer gas blown out of a nebulizer 13 is sufficiently more than the oxygen gas from the branch pipe 22, and since its flow flows in the tip direction of the torch 4 from a chamber 9, the oxygen gas flows in the direction of the torch 4 from the branch pipe 22, and does not flow to the chamber 9. Therefore, since the oxygen gas concentration in the chamber 9 is extremely reduced, even if a backfire is caused in the chamber 9, combustion is not caused, and it does not burst.