Solid-Phase Extraction Is a Sample Preparation Technique

question 20

Multiple Choice

Solid-phase extraction is a sample preparation technique.Which of the following statements is(are) NOT true for an aqueous solid-phase extraction?
I Solid-phase extraction separates analyte from the sample matrix using a chromatography stationary phase.
II An aliquot of the aqueous sample is applied to the solid-phase extraction tube,washing the sample with additional sample and then a water wash.
III The analyte sticks to the column and the water wash removes all species that do not adhere to the column.
IV An organic solvent is used to wash the analyte from the column.
V The organic phase containing the analyte is evaporated to dryness and the solid is dissolved in water,ready for analysis.

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

---

Definitions:

Restricted

Designated or limited to specific purposes, unable to be freely used or accessed.

Committed

Being pledged or obligated to do something, often referring to resources or efforts directed towards a specific cause or project.

Fiduciary Funds

These are funds used to account for resources held by an entity in a trustee or agent capacity for others, ensuring these assets are managed according to the trust agreement.

Proprietary Funds

Governmental accounting term for funds used by an organization that behaves like a private business, where the costs of providing goods or services to the public must be recovered through sales and fees.