Analysis and calculations

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