What is the name of the line labelled Y in the following chromatogram?

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BlackTom AI · Accepted Answer

In chromatograms, several labeled lines carry conventional meanings that help interpret the separation process.
Option a: 'retention line' is not a standard label used to describe a single reference line in a typical chromatogram; retention generally refers to the time or position at which a compound is detected, not a fixed line called 'retention line.'
Option b: 'solvent front' represents the leading edge of the mobile phase as it moves through the stationary phase; it marks the furthest advancement of solvent and is usually visible at the top of the chromatogram, not at the origin or a lower baseline.
Option c: 'origin' denotes the point where the sample is applied, the starting line or baseline for the chromatogram; it is typically located at the bottom of the chromatographic plate and corresponds to the initial application spot, which aligns with a dashed baseline near the bottom in many sketches.
Option d: 'water line' is not a standard term used in this context unless the method specifically references a water marker; in general chromatographic practice, the common reference lines are origin, solvent front, and baseline, while a 'water line' would be an unusual label unless the method explicitly defines it.
Overall, understanding how the labeled lines correspond to the setup and progression of separation helps identify which line is associated with the initial sample placement rather than progression or solvent movement. The visual cues in the diagram—such as a dashed baseline at the bottom and a distinct starting point—support the interpretation of the origin as the line in question.

What is the name of the line labelled Y in the following chromatogram?

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What is the name of the line labelled X in the following chromatogram?

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