Abstract
Using a long absorption tube with a hydrogen-air flame from a ring burner, some effects of the external heating of the tube, the rate of exhaust of the burnt gas, and the hydrogen flow rate on the sensitivity, the detection limit, and the memory effect of alkali metals were studied. The considerable improvement in the sensitivity and the detection limit was attained. Especially the external heating caused the more remarkable improvement of the detection limit and the sensitivity for the heavier alkali metals examined, while the memory effect was little changed.
