Some interference effects occurring in the hydrogen/argon/entrained-air flame

An examination was made of the effects of various cations and anions on the determinations of calcium (4227 Å) by flame emission using turbulent hydrogen/ argon/entrained-air and hydrogen/oxygen flames. The effects of height of observation and mechanisms of interference are discussed for Cs⁺, Rb⁺, F^-, Br^-, I^-, NO₃^-, Cl0₄^-, S0₄^2-, PO₄^3-, P₂O₇^4-, acetate, oxalate, citrate, tartrate and EDTA. Ionization interferences were not detected in the hydrogen/argon/entrained-air flame, but all other types of interference were more serious with this flame than with the hydrogen/ oxygen flame. The study also suggests some methods by which the effects of the interferences may be overcome.