| Abstract: | The determination of trace elements in solid samples by the combination of laser-evaporation and flameless AAS is used. A ruby laser with passive Q-switch vaporizes microamounts of solids in a chamber. The solid aerosol is transported by an Ar gas flow into a hot graphite furnace, where the solid particles are atomized for the AA-measurement. The influence of the parameters of the laser and the flow rate of Ar is exemplified by a silver determination. Several problems connected with the use of standard powders in laser-AAS are discussed. The vaporization of solids by the laser is the reason for the poor standard deviation of the absorbance values. The analytical results reported here were obtained by the standard addition-technique. |
