What do each of the spikes on the ion chromatograph represent?

• A. Different Elements in Different Locations
• B. Peaks Correspond to Reaction Rate
• C. Calibration Standards
• D. Different Isotopes of the Same Element

Answer: (A)

Spikes show when different ions come through the detector as they are separated by the column. Each spike corresponds to a distinct ion that eluted at a specific time, so you’re seeing the presence of different elements (in ion form) at different moments along the run. The detector’s signal rises as a particular ion passes, creating a peak whose position reflects when that ion came out.

This isn’t about reaction rates, which describe how fast something changes over time, nor is it about calibration standards, which are used to set reference points rather than representing each detected ion. Isotopes of the same element aren’t typically resolved as separate spikes in ion chromatography, so that option doesn’t fit either.