Analytes on the Surface of an Object Can Be Sampled

question 19

Multiple Choice

Analytes on the surface of an object can be sampled using an open-air sampling technique by vaporizing and ionizing the analyte directly from the surface under atmospheric conditions.Which of the following statements are true for these techniques?
I Direct analysis in real time generates excited He which produces protonated water clusters from distilled water.The water clusters protonate the analyte.
II Low-temperature plasma generates excited-state species in plasma,which ionizes the analyte.
III Desorption electrospray ionization directs micron-sized droplets of analyte-free solvent with electrospray,dissolving the analyte in the droplets.
IV All techniques dislodge analyte from the surface,collecting the ions for later mass spectrometer analysis.

• A)I and IV
• B)II and III
• C)I and III
• D)II and IV
• E)I and II

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