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Analysing substances - paper chromatography

  • Chemical analysis can be used to identify additives in foods.
  • Artificial colours can be detected and identified by paper chromatography.

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Gas chromatography

Gas chromatography allows the seperation of a mixture of compounds, the time taken for a substance to travel through the column can be used to help identify the substance. The ouput from the gas chromatography column can be linked to a mass spectometer, which can be used to identify the substances leaving the end of the coumn.

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