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GCSE Combined Science · key term
The pencil line on chromatography paper where the samples are placed before separation begins; also called the baseline.
Used by AQA
Specification 5.8.1.3 · Paper 4
Revise: ChromatographyDraw a horizontal pencil origin line 2 cm from the bottom short edge of the paper. Mark five equally spaced positions on it, keeping at least 0.5 cm from either side of the paper.
Measure both distances from the origin line, measuring to the centre of the substance spot.
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