Abstract
About 20 μl of sample solution was taken on a platinum coil simply by dipping it into the sample solution. The coil was brought close to, but not into, the flame to evaporate the solvent and then introduced into the flame. Atomization of the sample was immediately taken place and sharp absorption peaks were recorded for cadmium, zinc, lead, and mercury (II). The peak height was linearly proportional to the concentration of the element. The present method gave a 15-, 5-, 4-, and 12-fold enhancement in the sensitivity for cadmium, zinc, lead, and mercury (II), respectively, compared with the ordinary method, but gave a decrease in the sensitivity for calcium, copper, and iron on account of the broadening of absorption signals.
Eleven measurements for 0.2 ppm of zinc gave a relative standard deviation of about 3%. Various acids and co-existent elements remarkably interfered with the determination by this method, but by applying the standard addition method, zinc in aluminum and copper alloys was determined satis factory.
