Could someone please help me out with these questions:

4. Assume you are given a sample of beer, potentially with a concentration of about 0.5-1.4 g/L copper concentration, what analytical method would be most suitable for analysis?

5. Assume in the beer sample given (Q1) you need to not only analyze total copper but also quantify the specific amounts of Cu(I) and Cu(II); propose an analytical method most suited for this.

6. Comment on the detection limit of flame AAS and its ability of the instrument to detect 0.1 ng/L