Mutual Interference Effects of Certain Group III-A Ions with Calcium in Flame Spectroscopy
The reduction in emission intensity of calcium due to the presence of BO3 −3, Al+3, Ga+3 and In+3 in the test solutions has been determined. The reverse effect, i.e., the effect of calcium on emissions of Group III-A elements also has been determined. Sample dilution decreased BO3 −3 suppression but increased Al+3 suppression of calcium radiations. Apparently n-butanol forms a compound with the BO3 −3 ion in the evaporating aerosol droplet. This results in an increase in the band emissions owing to an excited state of the boron oxide in the flame, and effects a release of boron suppression of calcium radiations. The presence of methanol (10 to 50% by volume) and sucrose (1%) in the test solution decreases the effect produced by BO3 −3 but increases the effect of aluminum on calcium radiations. Difference in the degree of suppression of the Ca (I) line and CaO bands due to the presence of BO3 −3 or in the test solutions cannot be accounted for on the basis of an intermediate refractory solid phase. The effects of Ga+3 and In+3 on calcium radiations can best be explained in terms of a gas-phase suppression mechanism. In these studies both H2—O2 and C2H2—O2 fuel systems have been used.
KeywordsEmission Intensity Test Solution Boron Oxide Aerosol Droplet Calcium Emission
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