Abstract
Interference of lithium, sodium and potassium on the intensity of flame emission due to rubidium at 780 and 795mμ has been studied. The effects of these alkali ions on emission intensity at 795mμ are comparatively less and this wave length was therefore selected for flame photometric estimation of rubidium in five samples of Indian lepidolite and one sample of biotite. The effects of the other alkali ions were compensated by using simulated standard solutions containing the same amounts of alkali ions as present in the test solution. Reproducibility of the result is within ±0.02% and the time taken for a single estimation is nearly three hours.
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