direct-injection burner (for analytical flame spectroscopy)
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https://doi.org/10.1351/goldbook.D01770
A burner in which oxidant and fuel emerge from separate ports and are mixed above the burner orifices through their turbulent motion.
Source:
Orange Book, 2
nd
ed., p. 165 (https://media.iupac.org/publications/analytical_compendium/)