試題詳解

12. What is the predicted intensity of the nz 228 peak relative to the MH+ peak (m/z 227) for pentobarbital from chemical ionization, CIlH'N30s? The isotopic abundances are ¹³C = 1.08%, ²H = 0.012%, ¹⁵N = 0.37%, and ¹⁷O = 0.038%.
(A)11.5%；
(B)10.7%；
(C)6.55%；
(D)15.2%；
(E) 13.0%.