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At the Drugs Control Laboratory, King's College London, Danielle Moncrieffe explains how scientists use chromatography to test athletes' urine for banned substances.
Chromatography is the process of separating substances. Traditionally, scientists used paper, but now they use a machine called a mass spectrometer to identify substances based on weight.
Made as part of our Schools Experiments series:
• Brian Cox School Exper...
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