Abstract

The presence of PH₃ in C₂H₂ can cause serious depressions of analyte atomic signals in air/C₂H₂ and N₂O/C₂H₂ flames. In elements other than those in group 1a and 1b, a refractory metal-phosphorus-oxygen compound is formed during analyte desolvation and appears to slow the vaporization process. Data is presented describing the magnitude of the PH₃ depression for elements routinely determined in these flames. The effects of the PH₃ depression for these elements are compared to H₃PO₄ depressions, and the success of using chelating agents (EDTA) to reduce the depression is explored. Deviations from mathematical models describing the PH₃ effect are discussed, and the possibility of incomplete PH₃ combustion occurring in the flames is explored.

Atomic Absorption Spectroscopy with High Temperature Flames

J. B. Willis
Appl. Opt. 7(7) 1295-1304 (1968)

Determination of Phosphorus and Sulfur in Fuel Rich Air–Hydrogen Flames

Augusta Syty and John A. Dean
Appl. Opt. 7(7) 1331-1336 (1968)

Nitrous Oxide Supported Flames for Atomic Absorption Spectroscopy

L. R. P. Butler and Anne Fulton
Appl. Opt. 7(10) 2131-2137 (1968)

Atomic Emission Characteristics of a Premixed Acetylene–Nitrous Oxide, Total Consumption Flame

Victor G. Mossotti and Marjorie Duggan
Appl. Opt. 7(7) 1325-1330 (1968)

The Application of Separated Flames in Analytical Flame Spectroscopy

G. F. Kirkbright and T. S. West
Appl. Opt. 7(7) 1305-1311 (1968)