Introduction system for reactive gas samples into a plasma burner with inductively coupled plasma.

摘要

A torch device is provided for use in preparing a sample of a gas or vapor for analysis by an analyzer. The torch device (1) is comprised of an elongated cylindrical body with an inductively coupled plasma generating means (5, 6) located at its output or forward section (1B). The torch includes means (2) for separately feeding a sample of said reactive gas or vapor into a mixing chamber (10) located rearward of said plasma generating means, means (4) for separately feeding a nebulizer flow of a plasma gas and including water or solvent vapor or aerosol thereof into the mixing chamber to thereby mix with said sample, and means (11) for maintaining a first sheath of plasma gas concentrically about said sample mixture as it enters the plasma generating means for dissociation therein by a plasma flame, including means (12) for maintaining a second sheath of plasma gas around the first sheath as a coolant prior to introduction of ions formed by dissociation into said analyzer.