試題詳解

24. Why is the graphite furnace AA technique more sensitive than the flame AA technique for most of the transition metals? (1) the sample amount is larger for furnace AA； (2) the average residence time of atoms in furnace is much longer than in the open flame； (3) the steady-state concentration of atoms in the flame is much lower than in the furnace； (4) the flame temperature is higher than furnace's； (5) the detector of furnace AA is more sensitive. Your answer:
(A)2,3,5
(B)2,3
(C)4,5
(D)1,4,5
(E)3,4