Optional determination techniques in Atomic Absorption Spectroscopy
Remember this is "atomic" spectroscopy so it is expected that the "sample" is being totally ripped apart. So one "best technique" per element. 

$\ce{As}$, $\ce{Te}$, $\ce{Se}$, $\ce{Ge}$, $\ce{Sn}$, $\ce{Pb}$ are analyzed by the graphite tube technique rather than in a flame because the technique provides more sensitivity. 

$\ce{Hg}$ is an odd one since you use a cold vapor technique. 

Of course depending on the particular sample matrix what you might need to change.