Question

what are the first two steps in mass spectrometry often separated by? evaporation filtration distillation liquid chromatography

Explanation:

In mass - spectrometry, the first two steps (ionization and separation of ions) are often separated by liquid chromatography which can pre - separate the components of a mixture before ionization and mass analysis. Evaporation, filtration, and distillation are not the typical separators between the first two steps in mass spectrometry.

Answer:

D. Liquid Chromatography