Interference of Magnesium by Trace Concomitants in Flame Atomic Absorption Spectrometry.

摘要

The interference due to the presence of trace concomitants, generally overlooked in the previous communications, is considered in this paper. The influence of the low vapor pressure of the aqueous droplet, the high melting point of a solid particulate, and the low vapor pressure and the low surface/mass ratio of a molten droplet formed initially from a concentrated solution upon the shape of the atomic absorption analytical curve for Mg in an C2H2/Air flame is considered. The interference of various concentrations of AlCl3 upon Mg atomic absorption signals as a function of height above the burner top is also considered; it is found that at low flame heights, the plots of absorbance vs AlCl3 concentration contain fine structure (not flat curves). Finally the influence of varying acetylene flow rate and application of an electrical field across the sprayer and burner head are considered with respect to the Mg atomic absorption signals. (Author)