Headspace sampling is typically used for analyzing which type of analytes?

Headspace sampling is typically used for analyzing which type of analytes?

• A. Volatile compounds in a matrix.
• B. Nonvolatile macromolecules
• C. Heavy metals
• D. Proteins

Answer: (B)

Headspace sampling targets species that readily move into the gas phase from the sample. By sealing the sample and heating it, volatile compounds partition into the headspace above the matrix, and that vapor is collected for analysis (often by GC). This makes headspace ideal for volatile analytes like solvents, aromas, and other low-boiling-point compounds, while the matrix remains largely behind. Nonvolatile macromolecules, heavy metals, and proteins do not vaporize under typical headspace conditions, so they are not detected by headspace sampling; they require other methods or sample prep to analyze. The technique relies on equilibrium between the matrix and the gas phase (often described by a partition coefficient or Henry’s law), which is why it efficiently analyzes volatiles while reducing matrix effects.

Headspace sampling targets species that readily move into the gas phase from the sample. By sealing the sample and heating it, volatile compounds partition into the headspace above the matrix, and that vapor is collected for analysis (often by GC). This makes headspace ideal for volatile analytes like solvents, aromas, and other low-boiling-point compounds, while the matrix remains largely behind. Nonvolatile macromolecules, heavy metals, and proteins do not vaporize under typical headspace conditions, so they are not detected by headspace sampling; they require other methods or sample prep to analyze. The technique relies on equilibrium between the matrix and the gas phase (often described by a partition coefficient or Henry’s law), which is why it efficiently analyzes volatiles while reducing matrix effects.