Gas chromatography mas-spectrometer, 2000.
© Science Museum / Science & Society Picture Library
Gas chromatography mas-spectrometer (GCMS) for use in drug analysis, the Drug Control Centre, King's College, London. Gas chromatographs are used to separate mixtures of compounds. A mas spectrometer is used in chemical analysis to determine the exact chemical composition of a substance. Positive ions of a substance are separated by an electromagnetic system, which enables the relative concentrations of different ionic mases to be accurately measured. Mas-spectrometers can be applied in hospital operating rooms, in rockets in the upper atmosphere, and testing whether athletes have taken non-approved drugs to improve their performance.