An auxilary device has been used in tests done to measure contamination suppression achieved with a sheathed sprayer–burner in emission flame photometry. Sodium has been used as analyte and contaminant. Oxygen was utilized as sheath gas for oxygen–hydrogen flames.
Juan Ramírez-Muñoz, "Suppression of Flame Contamination with the Sprayer–Burner Sheath in Emission Flame Photometry," Appl. Spectrosc. 24, 98-100 (1970)