Which of the following statements about Atomic Absorption Spectrophotometry (AAS) are correct?
1. AAS can be used for the analysis of Na+, K+, Ca2+, and Mg2+.
2. AAS is commonly used for the determination of the concentration of heavy metals like Mn, Pb, Cr, and Cd.
3. In AAS, the flame serves to ionize the element from its chemical bonds.
4. AAS can only be used for the analysis of non-metallic elements.
1
(1) and (2) only
2
(1), (2), and (3) only
3
(1), (2), and (4) only
4
(3) and (4) only