31st October 2025

Which SPE mode involves retention via electrostatic interactions between cationic groups on analytes and anionic groups on the sorbent?

1. Non-polar SPE
2. Anion exchange SPE
3. Cation exchange SPE
4. Highly polar analytes

And the right answer is:

3. Cation exchange SPE

This question was from Dawn

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Last week's question - 24th October 2025

GC analysis using a cool-on-column injector is particularly good at dealing with samples containing which type of analytes?

1) Thermally labile analytes
2) Involatile analytes
3) Multiple analytes
4) Highly polar analytes