PURPOSE:To enable online real time analysis by introducing an inert gas into a hermetic vessel in which a molten metal is captured from the upper part thereof, discharging evaporating fine particles, introducing the same into a plasma emission spectrochemical analysis device and measuring the emission intensity of each element. CONSTITUTION:A tank 1 for capturing fine particles attached with a gaseous Ar introducing pipe 3 and a discharge pipe 5 for fine particles in the upper part is immersed in a molten steel 2 to form a hermetic vessel having an evaporating chamber 7 for fine particles. The pipes 3, 5 are respectively connected to a gaseous Ar vessel 8 and a plasma emission spectrochemical analysis device 10. A gaseous Ar introducing port 4 and a discharge port 6 for fine particles are respectively provided in the upper part of the chamber 7. The evaporating fine particles of the molten steel 2 in the chamber 7 are conveyed by the gaseous Ar flow into the device 10 which measures the emission intensity of each element in the fine particles. The concn. of each element in the molten steel 2 is thus determined.
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